Austin's SWE Notes 😭

    Header Vs Trailer

    Header is the extra bit of information at the start of the block to store the state of the protocol.

    • Header is in OSI Layers 6,5,4,3,2 (Everything except for Application & Physical)

    Trailer is the information occupied at the end of the block, they contain error-checking data.

    At minimum, most packet include a TCP header and an IP header

    [!note]
    When data packets move from Lower to Upper layer, headers get removed
    When data pack packets move from Upper to Lower, headers get added

    ← WAN (Wide Area Network)
    OSI Layers →