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D. all of the mentioned
For network layer design, several routing algorithms can be used. Some of these include:
1. Distance Vector Routing Algorithm: This algorithm calculates the best path for data packets based on the distance. Each router maintains a table (vector) of the minimum distance to each destination and the direction (vector) to go next.
2. Link State Routing Algorithm: In this algorithm, each node has a map of the connectivity to the network, i.e., the link states. This allows for the calculation of the shortest path to each node.
3. Path Vector Protocol: Similar to distance vector, but it also includes the path that data packets take to reach a destination. BGP (Border Gateway Protocol), used for routing over the internet, uses this method.
4. Open Shortest Path First (OSPF): This is a type of link-state routing protocol that operates within a single autonomous system. It’s widely used in large networks due to its efficiency and speed in rerouting around failed links.
5. Intermediate System to Intermediate System (IS-IS): Another example of a link-state routing protocol which, like OSPF, is used extensively within large enterprise and service provider networks.
6. Enhanced Interior Gateway Routing Protocol (EIGRP): Developed by Cisco Systems, it’s a hybrid routing protocol that incorporates features of both distance vector and link state protocols.
Each of these routing algorithms has its advantages and is chosen based on the specific requirements and constraints of the network