Jeremy's IT Lab CCNA OSPF (Part 1) Day 26

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

autonomous system boundary router (ASBR)

Configure an OSPF router to advertise its default route into the OSPF domain:

R1(config-router)# [...]

default-information originate

Configure the maximum number of paths an OSPF router will use to perform ECMP load-balancing:

R1(config-router)# [...]

maximum-paths number

Does single-area OSPF have to use area 0?

no

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

no

Enable OSPF on interfaces in the specified range:

R1(config-router)# [...]

network ip-address wildcard-mask area area

Enter OSPF configuration mode:

R1(config)# [...]

router ospf process-id

Manually configure the OSPF router ID:

R1(config-router)# [...]

router-id a.b.c.d

Modify the OSPF AD on the local router:

R1(config-router)# [...]

distance value

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

LSAs

OSPF can divide networks into separate [...]

areas

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

LSDB

OSPF LSAs have a default aging timer of [time]

30 minutes

OSPF Router ID selection priority:

1. [...]

2. Highest IP address on a loopback interface

3. Highest IP address on a physical interface

Manual configuration

OSPF Router ID selection priority:

1. Manual configuration

2. [...]

3. Highest IP address on a physical interface

Highest IP address on a loopback interface

OSPF Router ID selection priority:

1. Manual configuration

2. Highest IP address on a loopback interface

3. [...]

Highest IP address on a physical interface

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

area

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

interarea

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

intra-area

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

2

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

backbone

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

internal

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

area border routers (ABRs)

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

backbone

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

0

OSPF: What does ABR stand for?

Area Border Router

OSPF: What does ASBR stand for?

Autonomous System Boundary Router

OSPF: What does LSA stand for?

Link State Advertisement

OSPF: What does LSDB stand for?

Link State Database

Prevent an OSPF router from sending OSPF messages out of an OSPF-enabled interface:

R1(config-router)# [...]

passive-interface interface-id

Reset the OSPF process on the local router:

R1# [...]

clear ip ospf process

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

Dijkstra

Which version of OSPF is used for IPv6?

OSPFv3

Which version of OSPF is usually used for IPv4?

OSPFv2