Multiple choice

Which of the following options is true regarding OSPF?

  1. OSPF is an exterior gateway protocol (EGP).

  2. OSPF routing updates do not include the subnet masks.

  3. OSPF routing updates always contain the entire routing table.

  4. OSPF supports variable-length subnet masks.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

OSPF is a classless interior gateway protocol (IGP) which supports VLSM, hence includes the subnet masks in the routing updates. OSPF routers exchange the state of their links (interfaces) by sending incremental updates, not the entire routing table.

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