3 Packet-switching is a generic term that is applicable to many different aspects of networking.a Identify four different types of content that you would expect any packet to contain.b In a scenario when a particular protocol is being described, a packet may be given a different name. Identifyother names that can be used for a packet and, for each, identify the protocol that uses that name.
Question
3 Packet-switching is a generic term that is applicable to many different aspects of networking.a Identify four different types of content that you would expect any packet to contain.b In a scenario when a particular protocol is being described, a packet may be given a different name. Identifyother names that can be used for a packet and, for each, identify the protocol that uses that name.
Solution
a) Four different types of content that you would expect any packet to contain are:
- Header: This contains information about the packet like the source, destination, size, etc.
- Payload: This is the actual data that the packet is carrying.
- Trailer: This contains information to check if the packet has been corrupted during transmission.
- Checksum: This is a form of redundancy check used for error checking.
b) Different names that can be used for a packet in different protocols are:
- Datagram: This term is used in the Internet Protocol (IP). It is a self-contained, independent entity of data carrying sufficient information to be routed from the source to the destination computer without reliance on earlier exchanges between this source and destination computer and the transporting network.
- Frame: This term is used in network protocols like Ethernet. It is a digital data transmission unit that includes frame synchronization, packet payload, and error detection.
- Block: This term is used in protocols like FTP (File Transfer Protocol). It is a sequence of bytes or bits, having a predetermined length.
- Cell: This term is used in ATM (Asynchronous Transfer Mode) protocol. It is a small, fixed-size packet that is used for transmitting data.
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