Chapter 9 - Open Shortest Path First (OSPF)

Question 1

Compare OSPF and RIPv1.

Answer 1

OSPF is a link-state protocol that supports VLSM and classless routing; RIPv1 is a distance-vector protocol that does not support VLSM and supports only classful routing.

Question 2

Know how OSPF routers become neighbors and/ or adjacent.

Answer 2

OSPF routers become neighbors when each router sees the other’s Hello packets.

Question 3

Be able to configure single-area OSPF.

Answer 3

A minimal single-area configuration involves only two commands: router ospf process-id and network x.x.x.x y.y.y.y area Z.

Question 4

Be able to verify the operation of OSPF.

Answer 4

There are many show commands that provide useful details on OSPF, and it is useful to be completely familiar with the output of each: show ip ospf, show ip ospf database, show ip ospf interface, show ip ospf neighbor, and show ip protocols.

Question 5

Write the command that will enable the OSPF process 101 on a router.

Answer 5

router ospf 101

Question 6

Write the command that will display details of all OSPF routing processes enabled on a router.

Answer 6

show ip ospf

Question 7

Write the command that will display interface-specific OSPF information.

Answer 7

show ip ospf interface

Question 8

Write the command that will display all OSPF neighbors.

Answer 8

show ip ospf neighbor

Question 9

Write the command that will display all different OSPF route types that are currently known by the router.

Answer 9

show ip route ospf