Network Analysis

  1. Analyzing Network Protocols
    1. Network Layer Analysis
      1. IPv4 Header Analysis
        1. Version Field Verification
          1. Header Length Calculation
            1. Type of Service Analysis
              1. Total Length Validation
                1. Identification and Fragmentation
                  1. Fragment Identification
                    1. Fragment Offset
                      1. More Fragments Flag
                        1. Don't Fragment Flag
                        2. Time to Live Analysis
                          1. TTL Decrementing
                            1. Routing Loop Detection
                              1. Path Length Estimation
                              2. Protocol Field Identification
                                1. Header Checksum Validation
                                  1. Options Field Analysis
                                  2. IPv6 Header Analysis
                                    1. Version Field Verification
                                      1. Traffic Class Analysis
                                        1. Flow Label Usage
                                          1. Payload Length Validation
                                            1. Next Header Chain
                                              1. Hop Limit Analysis
                                                1. Extension Headers
                                                  1. Hop-by-Hop Options
                                                    1. Routing Header
                                                      1. Fragment Header
                                                        1. Destination Options
                                                      2. IP Fragmentation Analysis
                                                        1. Fragmentation Detection
                                                          1. Fragment Reassembly
                                                            1. Fragmentation Issues
                                                              1. Path MTU Discovery
                                                                1. Fragmentation Attacks
                                                                  1. Performance Impact
                                                                2. ICMP Analysis
                                                                  1. Echo Request and Reply Analysis
                                                                    1. Ping Operations
                                                                      1. Response Time Measurement
                                                                        1. Payload Analysis
                                                                        2. Error Message Analysis
                                                                          1. Destination Unreachable Types
                                                                            1. Time Exceeded Analysis
                                                                              1. Parameter Problem Detection
                                                                                1. Redirect Message Analysis
                                                                                2. Traceroute Analysis
                                                                                  1. Path Discovery
                                                                                    1. Hop-by-Hop Analysis
                                                                                      1. Route Changes
                                                                                  2. Transport Layer Analysis
                                                                                    1. TCP Analysis
                                                                                      1. Connection Establishment Analysis
                                                                                        1. Three-Way Handshake Verification
                                                                                          1. SYN Packet Analysis
                                                                                            1. SYN-ACK Response Analysis
                                                                                              1. ACK Completion Analysis
                                                                                              2. Connection Options
                                                                                                1. Maximum Segment Size
                                                                                                  1. Window Scaling
                                                                                                    1. Selective Acknowledgment
                                                                                                      1. Timestamps
                                                                                                    2. Sequence and Acknowledgment Analysis
                                                                                                      1. Initial Sequence Numbers
                                                                                                        1. Sequence Number Tracking
                                                                                                          1. Acknowledgment Validation
                                                                                                            1. Out-of-Order Detection
                                                                                                            2. Window Management
                                                                                                              1. Receive Window Analysis
                                                                                                                1. Window Scaling Factor
                                                                                                                  1. Zero Window Conditions
                                                                                                                    1. Window Updates
                                                                                                                    2. Flow Control Analysis
                                                                                                                      1. Sliding Window Protocol
                                                                                                                        1. Buffer Management
                                                                                                                          1. Backpressure Detection
                                                                                                                          2. Congestion Control Analysis
                                                                                                                            1. Slow Start Phase
                                                                                                                              1. Congestion Avoidance
                                                                                                                                1. Fast Retransmit
                                                                                                                                  1. Fast Recovery
                                                                                                                                  2. Connection Termination Analysis
                                                                                                                                    1. Four-Way Handshake
                                                                                                                                      1. FIN Packet Analysis
                                                                                                                                        1. Connection Reset Analysis
                                                                                                                                          1. TIME_WAIT State
                                                                                                                                          2. Error Detection and Recovery
                                                                                                                                            1. Retransmission Analysis
                                                                                                                                              1. Duplicate ACK Detection
                                                                                                                                                1. Selective Acknowledgment
                                                                                                                                                  1. Timeout Analysis
                                                                                                                                                2. UDP Analysis
                                                                                                                                                  1. Datagram Structure Analysis
                                                                                                                                                    1. Header Field Validation
                                                                                                                                                      1. Checksum Verification
                                                                                                                                                        1. Length Field Analysis
                                                                                                                                                        2. Connectionless Communication Patterns
                                                                                                                                                          1. Request-Response Analysis
                                                                                                                                                            1. Streaming Data Analysis
                                                                                                                                                              1. Broadcast and Multicast Analysis
                                                                                                                                                              2. Application Identification
                                                                                                                                                                1. Port-based Identification
                                                                                                                                                                  1. Payload Analysis
                                                                                                                                                                    1. Protocol Signatures
                                                                                                                                                                    2. Packet Loss Detection
                                                                                                                                                                      1. Sequence Number Analysis
                                                                                                                                                                        1. Application-level Detection
                                                                                                                                                                          1. Statistical Analysis
                                                                                                                                                                      2. Application Layer Analysis
                                                                                                                                                                        1. DNS Analysis
                                                                                                                                                                          1. Query Analysis
                                                                                                                                                                            1. Query Types
                                                                                                                                                                              1. A Record Queries
                                                                                                                                                                                1. AAAA Record Queries
                                                                                                                                                                                  1. CNAME Queries
                                                                                                                                                                                    1. MX Record Queries
                                                                                                                                                                                      1. PTR Queries
                                                                                                                                                                                      2. Query Flags
                                                                                                                                                                                        1. Question Section Analysis
                                                                                                                                                                                        2. Response Analysis
                                                                                                                                                                                          1. Response Codes
                                                                                                                                                                                            1. NOERROR
                                                                                                                                                                                              1. NXDOMAIN
                                                                                                                                                                                                1. SERVFAIL
                                                                                                                                                                                                  1. REFUSED
                                                                                                                                                                                                  2. Answer Section Analysis
                                                                                                                                                                                                    1. Authority Section Analysis
                                                                                                                                                                                                      1. Additional Section Analysis
                                                                                                                                                                                                      2. DNS Performance Analysis
                                                                                                                                                                                                        1. Query Response Time
                                                                                                                                                                                                          1. Cache Hit Rates
                                                                                                                                                                                                            1. Recursive vs. Iterative Queries
                                                                                                                                                                                                          2. DHCP Analysis
                                                                                                                                                                                                            1. DHCP Message Types
                                                                                                                                                                                                              1. DHCP Discover Analysis
                                                                                                                                                                                                                1. DHCP Offer Analysis
                                                                                                                                                                                                                  1. DHCP Request Analysis
                                                                                                                                                                                                                    1. DHCP Acknowledge Analysis
                                                                                                                                                                                                                      1. DHCP Release Analysis
                                                                                                                                                                                                                        1. DHCP Decline Analysis
                                                                                                                                                                                                                        2. DHCP Options Analysis
                                                                                                                                                                                                                          1. Subnet Mask Options
                                                                                                                                                                                                                            1. Router Options
                                                                                                                                                                                                                              1. DNS Server Options
                                                                                                                                                                                                                                1. Lease Time Options
                                                                                                                                                                                                                                  1. Vendor-specific Options
                                                                                                                                                                                                                                  2. Lease Management
                                                                                                                                                                                                                                    1. Lease Assignment Process
                                                                                                                                                                                                                                      1. Lease Renewal Process
                                                                                                                                                                                                                                        1. Lease Expiration Handling
                                                                                                                                                                                                                                      2. HTTP Analysis
                                                                                                                                                                                                                                        1. Request Analysis
                                                                                                                                                                                                                                          1. HTTP Methods
                                                                                                                                                                                                                                            1. GET Requests
                                                                                                                                                                                                                                              1. POST Requests
                                                                                                                                                                                                                                                1. PUT Requests
                                                                                                                                                                                                                                                  1. DELETE Requests
                                                                                                                                                                                                                                                  2. Request Headers
                                                                                                                                                                                                                                                    1. Host Header
                                                                                                                                                                                                                                                      1. User-Agent Header
                                                                                                                                                                                                                                                        1. Accept Headers
                                                                                                                                                                                                                                                          1. Authorization Headers
                                                                                                                                                                                                                                                          2. Request Body Analysis
                                                                                                                                                                                                                                                          3. Response Analysis
                                                                                                                                                                                                                                                            1. Status Codes
                                                                                                                                                                                                                                                              1. 2xx Success Codes
                                                                                                                                                                                                                                                                1. 3xx Redirection Codes
                                                                                                                                                                                                                                                                  1. 4xx Client Error Codes
                                                                                                                                                                                                                                                                    1. 5xx Server Error Codes
                                                                                                                                                                                                                                                                    2. Response Headers
                                                                                                                                                                                                                                                                      1. Content-Type Header
                                                                                                                                                                                                                                                                        1. Content-Length Header
                                                                                                                                                                                                                                                                          1. Cache-Control Headers
                                                                                                                                                                                                                                                                          2. Response Body Analysis
                                                                                                                                                                                                                                                                          3. HTTP Performance Analysis
                                                                                                                                                                                                                                                                            1. Request-Response Time
                                                                                                                                                                                                                                                                              1. Keep-Alive Connections
                                                                                                                                                                                                                                                                                1. Compression Analysis
                                                                                                                                                                                                                                                                                  1. Caching Behavior
                                                                                                                                                                                                                                                                                2. HTTPS and TLS Analysis
                                                                                                                                                                                                                                                                                  1. TLS Handshake Analysis
                                                                                                                                                                                                                                                                                    1. Client Hello Analysis
                                                                                                                                                                                                                                                                                      1. Server Hello Analysis
                                                                                                                                                                                                                                                                                        1. Certificate Exchange
                                                                                                                                                                                                                                                                                          1. Key Exchange
                                                                                                                                                                                                                                                                                            1. Handshake Completion
                                                                                                                                                                                                                                                                                            2. Certificate Analysis
                                                                                                                                                                                                                                                                                              1. Certificate Validation
                                                                                                                                                                                                                                                                                                1. Certificate Chain Analysis
                                                                                                                                                                                                                                                                                                  1. Certificate Expiration
                                                                                                                                                                                                                                                                                                  2. Encryption Analysis
                                                                                                                                                                                                                                                                                                    1. Cipher Suite Selection
                                                                                                                                                                                                                                                                                                      1. Key Length Analysis
                                                                                                                                                                                                                                                                                                        1. Protocol Version Analysis
                                                                                                                                                                                                                                                                                                      2. FTP Analysis
                                                                                                                                                                                                                                                                                                        1. Control Channel Analysis
                                                                                                                                                                                                                                                                                                          1. Command Analysis
                                                                                                                                                                                                                                                                                                            1. Response Code Analysis
                                                                                                                                                                                                                                                                                                              1. Authentication Process
                                                                                                                                                                                                                                                                                                              2. Data Channel Analysis
                                                                                                                                                                                                                                                                                                                1. Active vs. Passive Mode
                                                                                                                                                                                                                                                                                                                  1. Data Transfer Analysis
                                                                                                                                                                                                                                                                                                                    1. Transfer Completion
                                                                                                                                                                                                                                                                                                                    2. FTP Performance Analysis
                                                                                                                                                                                                                                                                                                                      1. Transfer Speed
                                                                                                                                                                                                                                                                                                                        1. Connection Overhead
                                                                                                                                                                                                                                                                                                                          1. Error Recovery

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                                                                                                                                                                                                                                                                                                                    7. Practical Application: Troubleshooting