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Memorising Stuff In Computer Networks

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OSI Layers

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MAC Frame

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Blutooth Layers

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Bluetooth Frame format

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Classful Addressing

Keep Adding one to the Left till you reach a four Digit Number

IPv4 Header

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TCP Header

Reference

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Unskilled Attacker Pester Real Security Folks

Unskilled = URG
Attackers = ACK
Pester = PSH
Real = RST
Security = SYN
Folks = FIN

https://danielmiessler.com/study/tcpflags/

Authentication Header

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ARP Encapsulation

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SSL

  • Fragmentation. First, SSL divides the data into blocks of 214 bytes or less.
  • Compression. Each fragment of data is compressed using one of the lossless com- pression methods negotiated between the client and server. This service is optional.
  • Message Integrity. To preserve the integrity of data, SSL uses a keyed-hash function to create a MAC.
  • Confidentiality. To provide confidentiality, the original data and the MAC are encrypted using symmetric-key cryptography.
  • Framing. A header is added to the encrypted payload. The payload is then passed to a reliable transport-layer protocol.

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