OSFP

Question 1

What type of protocol is OSPF?

Answer 1

A link state protocol.

Question 2

What algorithm does OSPF use to determine the shortest path?

Answer 2

The Dijkstra or Shortest Path First Algorithm.

Question 3

What is advertised between OSPF adjacent nighbors?

Answer 3

The status of directly connected links using LSA.

Question 4

When are LSA’ s sent beween OSPF neighbors?

Answer 4

1. When there is a change in the topology.

2. Every 30 minutes as a refesh.

Question 5

What are the 2 OSPF multicast addresses?

Answer 5

224. 0.0.5 = All OSPF routers

224. 0.0.6 = All DR’s

Question 6

What multicast address do P2P links use?

Answer 6

224.0.0.5

Question 7

What is the AD of an OSPF route?

Answer 7

110

Question 8

What metric does OSPF use to calculate routes?

Answer 8

Cost = Reference Bandwidth/Link Bandwidth

Question 9

Does OSPF have a hop count limit?

Answer 9

No.

Question 10

Can routers in different areas form adjacency?

Answer 10

No.

Question 11

What are must all routers be connected to?

Answer 11

(Backbone) Area 0.

Question 12

Routers in the same area have this in common?

Answer 12

They have the same topology table.

Question 13

These type of OSPF routers summarize routes?

Answer 13

ABR’s(Area Border Routers)

ASBR(Autonomous System Border Router)

Question 14

What is the purpose of OSPF areas?

Answer 14

To contain localized updates.

Question 15

This OSPF router performs redistribution?

Answer 15

ASBR(Autonomous System Border Router)

Question 16

What does the OSPF neighbor table contain?

Answer 16

A list of all neighboring routers.

Question 17

What does the OSPF topology table contain?

Answer 17

A list of all possible routes to all known networks in the same area.

Question 18

What does the OSPF route table contain?

Answer 18

The best routes for each known network.

Question 19

What are routers in the Backbone area called?

Answer 19

Backbone Routers

Question 20

What are routers between 2 areas called?

Answer 20

ABR’s(Area Border Routers)

Question 21

What are routers that connect w different routing protocols called?

Answer 21

ASBR’s(Autonomous System Border Routers)

Question 22

How are OSPF routers identified?

Answer 22

Router ID’s

Question 23

What are 3 ways to determine a RID?

Answer 23

1. Manually.
2. Highest IP of configured Loopbacks.
3. Highest IP of configured physical interface.