300-510 SPRI: Implementing Cisco Service Provider Advanced Routing SolutionsDemo

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QuestionQ62

Unicast Routing

What are two distinctions between OSPF and IS-IS?

Choose two
  • A Unlike IS-IS routers, an OSPF router belongs to only one area in addition to the backbone area
  • B OSPF uses a router ID to identify a router, and IS-IS uses a system ID
  • C OSPF is a link-state routing protocol, and IS-IS is a distance-vector routing protocol
  • D Unlike OSPF, IS-IS supports virtual links
  • E OSPF elects a DR and BDR, and IS-IS elects a DIS
Explanation

OSPF uses a router ID to uniquely identify a router, whereas IS-IS identifies an intermediate system with a system ID. On multiaccess networks, OSPF elects both a Designated Router (DR) and Backup Designated Router (BDR); IS-IS elects a Designated Intermediate System (DIS). Both protocols are link-state protocols.

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