OSPF

Describe OSPF in your own words.

OSPF areas, the purpose of having each of them

Types of OSPF LSA, the purpose of each LSA type

What exact LSA type you can see in different areas

How OSPF establishes neighboor relation, what the stages are

If OSPF router is stucked in each stage what the problem is and how to troubleshoot it

OSPF hierarchy in the single or multi areas. Cool OSPF behavior in broadcast and nonbroadcast

Draw the diagram of typical OSPF network and explain how it works, DR, BDR, election, ASBR, ABR, route redistribution and summarization

What is the BPDU hello timers time for NBMA . 30 ,120.

Will Point- multipoint will contain DR & BDR?   ans  : No

Stub and Not so stubby. 

Totally not so stubby

What type of router will contain stub and NSSA : stub contains ABR and totally NSSA will contain ASBR.

How they will work . ABR and ASBR will make a default route to the stub Routers.

Summarization : Inter area summarization Command.    We will do it in ABR

SW(Config-Router)#area area-id range address mask.

some questions on Default route and virtual link ?

area ID virtual link router id.

Virtual Link

To connect other area routers if the areas are unable to connect through area 0.

CMD  (router)#area are-id virtual-link router-id.