24 - OSPF Part 1

Question 1

An […] is an OSPF router that connects the OSPF network to an external network.

Answer 1

autonomous system boundary router (ASBR)

Question 2

Configure an OSPF router to advertise its default route into the OSPF domain:
R1(config-router)# […]

Answer 2

default-information originate

Question 3

Configure the maximum number of paths an OSPF router will use to perform ECMP load-balancing:
R1(config-router)# […]

Answer 3

maximum-paths number

Question 4

Does single-area OSPF have to use area 0?

Answer 4

No

Question 5

Does the OSPF process ID have to match for two routers to become OSPF neighbors?

Answer 5

No

Question 6

Enable OSPF on interfaces in the specified range:
R1(config-router)# […]

Answer 6

network <ip-address> area <area></area></ip-address>

Question 7

Enter OSPF configuration mode:
R1(config)# […]

Answer 7

router ospf <process-id></process-id>

Question 8

Manually configure the OSPF router ID:
R1(config-router)# […]

Answer 8

router-id <a.b.c.d></a.b.c.d>

Question 9

Modify the OSPF AD on the local router:
R1(config-router)# […]

Answer 9

distance <value></value>

Question 10

OSPF […] are organized in a structure called the LSDB.

Answer 10

LSAs

Question 11

OSPF can divide networks into separate […]

Answer 11

areas

Question 12

OSPF LSAs are organized in a structure called the […].

Answer 12

LSDB

Question 13

OSPF LSAs have a default aging timer of [time]

Answer 13

30 minutes

Question 14

OSPF Router ID selection priority:
1. […]
2. Highest IP address on a loopback interface
3. Highest IP address on a physical interface

Answer 14

Manual configuration

Question 15

OSPF Router ID selection priority:
1. Manual configuration
2. […]
3. Highest IP address on a physical interface

Answer 15

Highest IP address on a loopback interface

Question 16

OSPF Router ID selection priority:
1. Manual configuration
2. Highest IP address on a loopback interface
3. […]

Answer 16

Highest IP address on a physical interface

Question 17

OSPF: An […] is a set of routers and links that share the same LSDB.

Answer 17

area

Question 18

OSPF: An […] route is a route to a destination in a different OSPF area.

Answer 18

interarea

Question 19

OSPF: An […] route is a route to a destination inside the same OSPF area.

Answer 19

intra-area

Question 20

OSPF: It is recommend that you connect an ABR to a maximum of […] areas.

Answer 20

2

Question 21

OSPF: Routers connected to the backbone area (area 0) are called […] routers.

Answer 21

backbone

Question 22

OSPF: Routers with all interfaces in the same area are called […] routers.

Answer 22

internal

Question 23

OSPF: Routers with interfaces in multiple areas are called […].

Answer 23

area border routers (ABRs)

Question 24

OSPF: The […] area (area 0) is an area that all other areas must connect to.

Answer 24

backbone

Question 25

OSPF: The backbone area (area […]) is an area that all other areas must connect to.

Answer 25

0

Question 26

OSPF: What does ABR stand for?

Answer 26

Area Border Router

Question 27

OSPF: What does ASBR stand for?

Answer 27

Autonomous System Boundary Router

Question 28

OSPF: What does LSA stand for?

Answer 28

Link State Advertisement

Question 29

OSPF: What does LSDB stand for?

Answer 29

Link State Database

Question 30

Prevent an OSPF router from sending OSPF messages out of an OSPF-enabled interface:
R1(config-router)# […]

Answer 30

passive-interface <interface-id></interface-id>

Question 31

Reset the OSPF process on the local router:
R1# […]

Answer 31

clear ip ospf process

Question 32

The Shortest Path First algorithm is also known as […]’s algorithm.

Answer 32

Dijkstra

Question 33

Which version of OSPF is used for IPv6?

Answer 33

OSPFv3

Question 34

Which version of OSPF is usually used for IPv4?

Answer 34

OSPFv2