Which of the following statement/s is / are NOT CORRECT ? (A) OSPF is based on…
2023
Which of the following statement/s is / are NOT CORRECT ?
(A) OSPF is based on distance-vector routing protocol.
(B) Both link-state and distance-vector routing are based on the least cost goal.
(C) BGP4 is based on the path-vector algorithm.
(D) The three-node instability can be avoided using split horizon combined with poison reverse.
(E) RIP is based on link state algorithm.
Choose the correct answer from the options given below :
Answer: A. (A), (D) and (E) Only — Answer: The statements that are NOT correct are the following three: OSPF is based on distance-vector routing protocol: This is incorrect because OSPF is a…
- A.
(A), (D) and (E) Only
- B.
(A) and (B) Only
- C.
(B) and (C) Only
- D.
(B), (C) and (E) Only
Attempted by 298 students.
Show answer & explanation
Correct answer: A
Answer:
The statements that are NOT correct are the following three:
OSPF is based on distance-vector routing protocol: This is incorrect because OSPF is a link-state protocol that builds a complete map of the network and uses Dijkstra's algorithm to compute least-cost paths.
The three-node instability can be avoided using split horizon combined with poison reverse: This is incorrect because split horizon and poison reverse mitigate some simple loops but do not guarantee prevention of count-to-infinity or instability in topologies involving three or more nodes.
RIP is based on link state algorithm: This is incorrect because RIP is a distance-vector protocol that uses hop count as its metric and relies on Bellman–Ford style updates.
Notes on the other statements:
Both link-state and distance-vector routing aim to find least-cost paths; this statement is correct.
BGP4 is based on the path-vector algorithm; this statement is correct.
Therefore, the correct selection is the one that lists the three incorrect statements given above (the claims about OSPF being distance-vector, split horizon with poison reverse eliminating three-node instability, and RIP being link-state).