Routing Protocols & IP Addressing Flashcards

An Aruba switch is running OSPF. Which LSA type is generated by an ABR to describe routes from one area to another?

Answer: Type 3 - Summary LSA

ABRs generate Type 3 Summary LSAs to advertise inter-area routes between OSPF areas.

What is the administrative distance of OSPF on an ArubaOS-CX switch by default?

Answer: 110

OSPF has a default administrative distance of 110 on ArubaOS-CX switches.

Which OSPF network type does ArubaOS-CX assign to an interface configured as a point-to-point link?

Answer: Point-to-point

ArubaOS-CX assigns the point-to-point OSPF network type to interfaces connecting exactly two routers, eliminating DR/BDR election.

A network engineer needs to prevent an ArubaOS-CX switch from becoming the OSPF DR on a broadcast segment. What is the most reliable method?

Answer: Set the OSPF priority to 0

Setting the OSPF interface priority to 0 makes the router ineligible for DR/BDR election.

Which command on ArubaOS-CX verifies that OSPF neighbors have reached the FULL adjacency state?

Answer: show ip ospf neighbor

The 'show ip ospf neighbor' command displays neighbor states, including whether adjacency has reached FULL.

An OSPF stub area is configured on an ArubaOS-CX switch. Which LSA type is blocked from entering the stub area?

Answer: Type 5

OSPF stub areas block Type 5 AS External LSAs, replacing external routes with a default route from the ABR.

What does the OSPF cost metric on an ArubaOS-CX interface represent?

Answer: The inverse of bandwidth on the link

OSPF cost is calculated as reference bandwidth divided by interface bandwidth, making it inversely proportional to link speed.