Network Traffic Monitoring and Analysis

  1. Data Sources and Collection Methods
    1. Packet-Level Data
      1. Definition and Characteristics
        1. Granularity and Detail
          1. Complete Packet Contents
            1. Header Information
              1. Payload Data
              2. Storage Requirements
                1. Disk Space Considerations
                  1. Retention Policies
                    1. Compression Techniques
                  2. Packet Capture Methods
                    1. Port Mirroring
                      1. SPAN Configuration
                        1. Local SPAN
                          1. Remote SPAN
                            1. Configuration Steps
                            2. RSPAN Configuration
                              1. RSPAN VLANs
                                1. Source and Destination
                                  1. Network Requirements
                                  2. Use Cases and Limitations
                                    1. Traffic Volume Considerations
                                      1. Performance Impact
                                        1. Filtering Capabilities
                                      2. Network TAPs
                                        1. Passive TAPs
                                          1. Operation Principles
                                            1. Benefits and Advantages
                                              1. Deployment Scenarios
                                              2. Active TAPs
                                                1. Power Requirements
                                                  1. Signal Regeneration
                                                    1. Management Features
                                                    2. TAP Placement Strategies
                                                      1. Network Segmentation Points
                                                        1. Redundancy Considerations
                                                      2. Agent-based Capture
                                                        1. Host-based Agents
                                                          1. Software Agents
                                                            1. Hardware Agents
                                                              1. Agent Capabilities
                                                              2. Deployment Considerations
                                                                1. Performance Impact
                                                                  1. Security Implications
                                                                    1. Management Overhead
                                                                2. Packet Capture File Formats
                                                                  1. PCAP Format
                                                                    1. File Structure
                                                                      1. Header Information
                                                                        1. Packet Records
                                                                          1. Compatibility Issues
                                                                          2. PCAPng Format
                                                                            1. Extended Features
                                                                              1. Multiple Interface Support
                                                                                1. Enhanced Metadata
                                                                                  1. Annotation Capabilities
                                                                              2. Flow-Based Data
                                                                                1. Definition and Characteristics
                                                                                  1. Aggregated Traffic Summaries
                                                                                    1. Flow Definition
                                                                                      1. Statistical Aggregation
                                                                                        1. Time-Based Grouping
                                                                                        2. Scalability Benefits
                                                                                          1. Reduced Storage Requirements
                                                                                            1. Faster Processing
                                                                                              1. Network Efficiency
                                                                                            2. Key Flow Data Elements
                                                                                              1. 5-tuple Identification
                                                                                                1. Source IP Address
                                                                                                  1. Destination IP Address
                                                                                                    1. Source Port
                                                                                                      1. Destination Port
                                                                                                        1. Protocol
                                                                                                        2. 7-tuple Extensions
                                                                                                          1. Type of Service
                                                                                                            1. Input Interface
                                                                                                            2. Additional Flow Attributes
                                                                                                              1. Byte Counts
                                                                                                                1. Packet Counts
                                                                                                                  1. Flow Duration
                                                                                                                    1. TCP Flags
                                                                                                                  2. Flow Collection Protocols
                                                                                                                    1. NetFlow
                                                                                                                      1. Version Differences
                                                                                                                        1. NetFlow v1
                                                                                                                          1. NetFlow v5
                                                                                                                            1. NetFlow v9
                                                                                                                            2. Exporters and Collectors
                                                                                                                              1. Flow Exporter Configuration
                                                                                                                                1. Collector Setup
                                                                                                                                  1. Template Management
                                                                                                                                2. IPFIX
                                                                                                                                  1. Template-Based Architecture
                                                                                                                                    1. Custom Templates
                                                                                                                                      1. Information Elements
                                                                                                                                        1. Template Records
                                                                                                                                          1. Data Records
                                                                                                                                          2. Standards Compliance
                                                                                                                                          3. sFlow
                                                                                                                                            1. Sampling Techniques
                                                                                                                                              1. Packet Sampling
                                                                                                                                                1. Counter Sampling
                                                                                                                                                  1. Sampling Rates
                                                                                                                                                  2. sFlow Architecture
                                                                                                                                                    1. sFlow Agents
                                                                                                                                                      1. sFlow Collectors
                                                                                                                                                        1. Data Export
                                                                                                                                                      2. J-Flow
                                                                                                                                                        1. Juniper Implementation
                                                                                                                                                          1. Vendor-Specific Features
                                                                                                                                                            1. Configuration Options
                                                                                                                                                            2. NetStream
                                                                                                                                                              1. Huawei Implementation
                                                                                                                                                                1. Implementation Details
                                                                                                                                                                  1. Feature Comparison
                                                                                                                                                              2. Log and Event Data
                                                                                                                                                                1. Syslog
                                                                                                                                                                  1. Log Levels
                                                                                                                                                                    1. Emergency Level
                                                                                                                                                                      1. Alert Level
                                                                                                                                                                        1. Critical Level
                                                                                                                                                                          1. Error Level
                                                                                                                                                                            1. Warning Level
                                                                                                                                                                              1. Notice Level
                                                                                                                                                                                1. Informational Level
                                                                                                                                                                                  1. Debug Level
                                                                                                                                                                                  2. Message Structure
                                                                                                                                                                                    1. Priority Field
                                                                                                                                                                                      1. Header Information
                                                                                                                                                                                        1. Message Content
                                                                                                                                                                                        2. Syslog Protocols
                                                                                                                                                                                          1. UDP Syslog
                                                                                                                                                                                            1. TCP Syslog
                                                                                                                                                                                              1. TLS Syslog
                                                                                                                                                                                            2. Simple Network Management Protocol
                                                                                                                                                                                              1. SNMP Versions
                                                                                                                                                                                                1. SNMPv1
                                                                                                                                                                                                  1. SNMPv2c
                                                                                                                                                                                                    1. SNMPv3
                                                                                                                                                                                                    2. SNMP Operations
                                                                                                                                                                                                      1. GET Operations
                                                                                                                                                                                                        1. SET Operations
                                                                                                                                                                                                          1. WALK Operations
                                                                                                                                                                                                          2. SNMP Traps
                                                                                                                                                                                                            1. Trap Types
                                                                                                                                                                                                              1. Trap Configuration
                                                                                                                                                                                                                1. Trap Processing
                                                                                                                                                                                                                2. Management Information Base
                                                                                                                                                                                                                  1. MIB Structure
                                                                                                                                                                                                                    1. Object Identifiers
                                                                                                                                                                                                                      1. Standard MIBs
                                                                                                                                                                                                                    2. Windows Event Logs
                                                                                                                                                                                                                      1. Event Log Types
                                                                                                                                                                                                                        1. System Log
                                                                                                                                                                                                                          1. Application Log
                                                                                                                                                                                                                            1. Security Log
                                                                                                                                                                                                                              1. Setup Log
                                                                                                                                                                                                                              2. Event Structure
                                                                                                                                                                                                                                1. Event ID
                                                                                                                                                                                                                                  1. Event Source
                                                                                                                                                                                                                                    1. Event Description
                                                                                                                                                                                                                                      1. Timestamp Information
                                                                                                                                                                                                                                    2. Firewall and Proxy Logs
                                                                                                                                                                                                                                      1. Log Fields
                                                                                                                                                                                                                                        1. Source Information
                                                                                                                                                                                                                                          1. Destination Information
                                                                                                                                                                                                                                            1. Action Taken
                                                                                                                                                                                                                                              1. Rule Information
                                                                                                                                                                                                                                              2. Log Formats
                                                                                                                                                                                                                                                1. Common Log Format
                                                                                                                                                                                                                                                  1. Extended Log Format
                                                                                                                                                                                                                                                    1. Custom Formats
                                                                                                                                                                                                                                                    2. Log Retention and Analysis
                                                                                                                                                                                                                                                      1. Retention Policies
                                                                                                                                                                                                                                                        1. Log Rotation
                                                                                                                                                                                                                                                          1. Analysis Techniques

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                                                                                                                                                                                                                                                    4. Tools for Traffic Monitoring and Analysis