Which two protocols are link-state routing protocols? (Choose two.)EIGRPOSPFBGPRIPISIS
Question
Which two protocols are link-state routing protocols? (Choose two.)
- EIGRP
- OSPF
- BGP
- RIP
- IS-IS
Solution
Sure, let's break down the question step by step to identify which two protocols are link-state routing protocols.
-
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.
-
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)
-
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.
- OSPF (Open Shortest Path First):
-
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.
-
Conclusion:
- The two link-state routing protocols from the given list are:
- OSPF (Open Shortest Path First)
- IS-IS (Intermediate System to Intermediate System)
- The two link-state routing protocols from the given list are:
So, the correct answer is:
- OSPF
- IS-IS
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