You have a network containing 120 routers. You must establish and maintain connectivity between the loopback interfaces of all routers. Because of the critical services using the network, you need redundancy and fast failover.
Which routing protocol should you use in this scenario?
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A. B. C. D.A
For a network with 120 routers, it is essential to have a robust routing protocol to establish and maintain connectivity between the loopback interfaces of all routers. The routing protocol should be able to handle the size of the network and provide fast convergence in case of link failures to minimize downtime.
Among the given options, OSPF is the most suitable routing protocol for this scenario. OSPF (Open Shortest Path First) is a link-state routing protocol that is widely used in large enterprise networks. OSPF has the following features that make it a good fit for this scenario:
Scalability: OSPF is designed to handle large networks with many routers and multiple paths between them. It uses a hierarchical structure with area boundaries to improve the scalability of the network.
Fast Convergence: OSPF has a fast convergence time because it uses a distributed database that allows routers to quickly compute the shortest path to a destination. When a link fails, only the affected routers need to update their databases, which leads to fast convergence.
Redundancy: OSPF supports equal-cost multipath (ECMP), which allows traffic to be distributed over multiple paths with the same cost. This provides redundancy and improves network availability.
Loop Prevention: OSPF uses a loop-free path selection algorithm that prevents routing loops in the network.
In contrast, RIP (Routing Information Protocol) is a distance-vector routing protocol that is less suitable for large networks because it has limited scalability and slow convergence. BGP (Border Gateway Protocol) is primarily used for inter-domain routing and is not well-suited for intra-domain routing within a single network. Static routing is not a viable option for a large network with many routers because it is difficult to configure and maintain.
Therefore, in this scenario, OSPF is the best choice for establishing and maintaining connectivity between the loopback interfaces of all routers while providing redundancy and fast failover.