Question

What are two major differences between OSPF and IS-IS routing protocols? (Choose two.)

Accepted Answer

A. OSPF uses IP protocol 89 for encapsulation, and IS-IS uses an IEEE 802.3 standard-based protocol for encapsulation.; E. The OSPF DR role can be pre-empted only when the active DR goes down, but the IS-IS DR role can be taken by a router with higher priority at any time.

Answer

OSPF partially refreshes the LSA database every 30 minutes, and IS-IS refreshes the complete database table every 60 minutes.

Answer

An OSPF-enabled router is part of only one area, but an IS-IS-enabled router is part of multiple areas.

Answer

The OSPF default administrative distance is 115, and the default administrative distance for IS-IS is 110.