Network

Question 1

What type of Routing protocol predominantly is OSPF?

Answer 1

Link State

Question 2

When does OSPF exhibit distance vector routing attributes?

Answer 2

Between Areas

Question 3

What does OSPF stand for?

Answer 3

Open Shortest Path First

Question 4

What Algorithm does OSPF use for path calculation?

Answer 4

Dijkstra Algorithm

Question 5

Is OSPF an EGP or IGP protocol?

Answer 5

IGP

Question 6

Define DR

Answer 6

Designated Router -

Question 7

Define ABR

Answer 7

Area Border Router -

Question 8

Define ASBR

Answer 8

Autonomous System Border Router -

Question 9

Define NSSA

Answer 9

Not-So-Stubby-Area -

Question 10

How do OSPF discovery neighbor rotuers?

Answer 10

Hello messages with link state information

Question 11

Default hello interval?

Answer 11

10 Seconds

Question 12

How often does OSPF routers flood routes and why?

Answer 12

30 mins and because all LSAs have a MaxAge where they will be removed

Question 13

What are the differences between v2 and v3?

Answer 13

1. v3 supports IPv6
2. v3 uses prefix and prefix lengths
3. v3 Link Local IPv6 for discovery
4. v3 IPv6 RFC6506 or IPsec RFC4552 for authentication – not supported by NX-OS
5. New LSA definitions
6. BFD is v2 only

Question 14

Default Dead_Interval

Answer 14

4x Hello timers

Question 15

What happens if Dead_interval is reached?

Answer 15

Router is removed from neighbor table