Which two protocols are link-state routing protocols? (Choose two.)EIGRPOSPFBGPRIPISIS

Sure, let's break down the question step by step to identify which two protocols are link-state routing protocols.

1. Understanding Link-State Routing Protocols:

   • Link-state routing protocols maintain a complete map of the network topology.
   • They use algorithms like Dijkstra's to calculate the shortest path to each node.
   • They are more complex and require more memory and processing power compared to distance-vector protocols.

2. List of Protocols Given:

   • EIGRP (Enhanced Interior Gateway Routing Protocol)
   • OSPF (Open Shortest Path First)
   • BGP (Border Gateway Protocol)
   • RIP (Routing Information Protocol)
   • IS-IS (Intermediate System to Intermediate System)

3. Identifying Link-State Protocols:

   • OSPF (Open Shortest Path First):
     • OSPF is a widely used link-state routing protocol.
     • It uses the Dijkstra algorithm to compute the shortest path tree.
   • IS-IS (Intermediate System to Intermediate System):
     • IS-IS is another link-state routing protocol.
     • It also uses the Dijkstra algorithm for path computation.

4. Eliminating Non-Link-State Protocols:

   • EIGRP: This is a hybrid routing protocol that combines features of both distance-vector and link-state protocols, but it is not purely a link-state protocol.
   • BGP: This is a path-vector protocol used for inter-domain routing, not a link-state protocol.
   • RIP: This is a distance-vector routing protocol, not a link-state protocol.

5. Conclusion:

   • The two link-state routing protocols from the given list are:
     • OSPF (Open Shortest Path First)
     • IS-IS (Intermediate System to Intermediate System)

So, the correct answer is:

• OSPF
• IS-IS