a) The sender in the Stop and Wait protocol waits for an ACK before delivering the following packet. But what if an ACK is lost in transit and never reaches the sender? In that scenario, what should the sender do? b) A sender process sends 100 packets to a receiver process. Out of 100 packets, 80 make it to their destination, while 20 are lost in the network. How many ACKs will the receiver send to the sender when using: ACK (acceptable/normal ACK) • NACK (not acceptable) c) Why do we require a length field in the UDP header since the length of the UDP header is always the same (i.e. 8 bytes)?

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Types Of Protocols

A network protocol is a collection of rules that governs the exchange of data between devices connected to the same network. In other words, network protocols are rules that specify how devices communicate or transfer data over a network. The sender and receiver systems must obey the standards to facilitate communication between them.