a) Difine the term node addressing methods.

b) outline the following features of node addressing method:
- circuit switching
- message switching
- packet switching
- frame relay
- cell relay

1 answer

a) Node addressing methods refer to the techniques used to identify and route data packets to specific nodes or devices on a network. This involves assigning unique addresses to each node so that data can be directed to its intended destination.

b)
- Circuit switching: In circuit switching, a dedicated communication path is established between two nodes before any data transfer occurs. This path remains fixed for the duration of the communication session. This method is commonly used in traditional telephone networks.

- Message switching: In message switching, the entire message is stored and forwarded through the network from one node to the next until it reaches its destination. Each node in the network receives the entire message before forwarding it to the next node. This method is inefficient for large messages and is rarely used in modern networks.

- Packet switching: In packet switching, data is divided into smaller packets, each with its own address. These packets are then routed independently through the network to their destination. This method is more efficient than circuit switching as it allows multiple packets to be transmitted simultaneously over the same network.

- Frame relay: Frame relay is a packet-switching technology that operates at the data link layer of the OSI model. It is used to efficiently transmit data between devices on a Wide Area Network (WAN). Frame relay networks use virtual circuits to establish a connection between nodes in the network.

- Cell relay: Cell relay is a packet-switching technology similar to frame relay but with fixed-length packets known as cells. These cells are switched through the network using asynchronous transfer mode (ATM) technology. Cell relay is often used for high-speed data transmission and for supporting multimedia applications.
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