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Network Secuirty (OSI Layers (Open Systems Interconnection) (Application…

- - - - Active Mode
        
        port 21(For TCP control connection)
        
        port 20(For data channel)
      - Passive Mode
        
        port 1024~(For data channel)
      - Vulnerability
        
        tFTP Attack
        (Trivial File Transfer Protocol)
        
        Anonymous Attack
        
        Bounce Attack
    - - TLS record
        
        Fragmentation
        
        Compression
        
        MAC
        (Message Authentication Code)
        
        Encryption
      - TLS handshake
- - - - Log management
        
        로그분류
        (Log rotation)
        
        로그변환
        
        로그분석
        (Log analysis)
        
        로그수집
        (Log collection)
  - - - Bastion Host
      - Screening Router
  - - - ACL Policy
        (Access Control List)
      - Egress Filtering
      - Blackhole Filtering)
- - - - Send Broadcast using Echo request
      - ICMP Echo Request
      - Directed broadcast
      - Mitigation
        
        not respond to ICMP requests or broadcasts
        
        not forward packets directed to broadcast addresses
- - - - Fragment ID(Identification)
      - Fragment Size
      - Fragment Offset
  - - - ifconfig eth0 -promisc
        (disable promiscuous mode)
      - /var/log/messages
        (this file is need when i find to exact time)
  - - - Polling
      - Event Reporting or Trap, Interrupt
- - - - nocase
        (대ㆍ소문자를 구분하지 않는다)
      - threshold
- - - - X-MAS Scan
      - Null Scan
      - ACK or TCP FIN Scan