Which protocol has a header of 5 bytes and a trailer of 3 bytes?

The Point-to-Point Protocol (PPP) is designed specifically for establishing direct connections between two networking nodes. One of its defining characteristics is its structure, which includes a header of 5 bytes and a trailer of 3 bytes. This structure allows PPP to encapsulate multiple Layer 3 protocols such as IP, providing flexibility in diverse networking environments.

The 5-byte header typically contains important information necessary for establishing the link and managing the connection, such as protocol identification and control fields. The 3-byte trailer generally includes information for error detection, which is vital for maintaining the integrity of data during transmission.

Understanding this protocol's structure is essential for networking professionals, as it highlights the efficiency of data transmission and the importance of error checking in maintaining reliable communications over serial links.