Question 1

Which Cisco IOS command is used to display the current OSPF neighbors and their RIDs?&#10;A) show ip ospf neighbor&#10;B) show ospf neighbors&#10;C) show interface ospf neighbors&#10;D) show ip interface ospf neighbors

Accepted Answer

A) The show ip ospf neighbor Cisco IOS command is used to display the current OSPF (v2-IPv4) neighbors of the local device.

Question 2

In which OSPF state would a neighbor be if it has learned of a neighbor's existence but has not yet seen its own RID in an LSDB update?&#10;A) Loading&#10;B) Down&#10;C) Init&#10;D) 2-way

Accepted Answer

C) When a device initially sees a neighbor, the OSPF state will transition to Init; when it sees its own RID in an updated OSPF (hello) packet, the OSPF state will transition to 2-way.

Question 3

When a pair of OSPF neighbors has reached the ________ state, they can exchange their LSDB with each other.&#10;A) Loading&#10;B) Down&#10;C) Init&#10;D) 2-way

Accepted Answer

D) When a device initially sees a neighbor, the OSPF state will transition to Init; when it sees its own RID in an updated LSDB packet, the OSPF state will transition to 2-way.

Question 4

What type of OSPF packet is used to list the LSAs that are known by a device?&#10;A) DD&#10;B) LSU&#10;C) LSR&#10;D) LSA

Accepted Answer

A) The exchange of known LSAs between two OSPF devices (if not neighbors yet) or neighbors is done with an OSPF Database Description (DD) packet.

Question 5

What type of OSPF packet is used to actually send LSAs between neighbors?&#10;A) DD&#10;B) LSU&#10;C) LSR&#10;D) LSA

Accepted Answer

B) When a pair of OSPF neighbors has exchanged a list of their known LSAs with the OSPF DD (Database Description) packets, the actual LSAs that are not known by each respective device are sent using Link State Update (LSU) packets.

Question 6

What default length is used for the OSPF dead interval?&#10;A) 20 seconds&#10;B) 40 seconds&#10;C) 4 times the Hello Interval&#10;D) 120 seconds

Accepted Answer

C) The default OSPF Dead Interval is configured as four times the current Hello timer unless the Dead Interval is independently configured.

Question 7

What term does OSPF use to reference a router that has interfaces in more than one area?&#10;A) ASBR&#10;B) Backbone&#10;C) Internal&#10;D) ABR

Accepted Answer

D) OSPF uses the term Area Border Router (ABR) to reference a router that has interfaces in more than one area.

Question 8

A(n) ________ is a routing protocol that was designed and intended for use inside a single autonomous system.&#10;A) IGP&#10;B) EGP&#10;C) BGP&#10;D) IXR

Accepted Answer

A) An Interior Gateway Protocol (IGP) is a routing protocol that was designed and intended for use inside a single autonomous system.

Question 9

Which routing protocols are not considered Distance Vector?&#10;A) RIP&#10;B) OSPF&#10;C) EIGRP&#10;D) IGRP

Accepted Answer

B) RIP, IGRP, and EIGRP are all considered distance vector protocols (or advanced distance vector), while OSPF is a link state protocol.

Question 10

Which components are used as part of EIGRP's default metric?&#10;A) Hop Count&#10;B) Link Reliability&#10;C) Bandwidth&#10;D) Delay

Accepted Answer

C) By default, EIGRP uses a composite metric based on the minimum path bandwidth and the cumulative delays.
D) By default, EIGRP uses a composite metric based on the minimum path bandwidth and the cumulative delays.

Question 11

Which IGP routing protocol has traditionally been Cisco proprietary?&#10;A) EIGRP&#10;B) OSPF&#10;C) RIP&#10;D) IS-IS

Accepted Answer

The answer of Which IGP routing protocol has traditionally been...

Question 12

Which Cisco IOS command is used to list information about the OSPF LSDB on a device?&#10;A) show ip ospf lsdb&#10;B) show ip ospf topology&#10;C) show ip ospf database&#10;D) show ip ospf lsa

Accepted Answer

The answer of Which Cisco IOS command is used to...

Question 13

Which IP multicast address is used by OSPF to communicate with all OSPF speaking routers?&#10;A) 224.0.0.10&#10;B) 224.0.0.2&#10;C) 224.0.0.6&#10;D) 224.0.0.5

Accepted Answer

The answer of Which IP multicast address is used by...

Question 14

Each OSPF router that originates an LSA is responsible for reflooding it every ________.&#10;A) 30 minutes&#10;B) 60 minutes&#10;C) 120 minutes&#10;D) 15 minutes

Accepted Answer

The answer of Each OSPF router that originates an LSA...

Question 15

Which of the following is a routing protocol designed and intended for use between different autonomous systems?&#10;A) IGP&#10;B) EGP&#10;C) BGP&#10;D) IXR

Accepted Answer

The answer of Which of the following is a routing...

Question 16

What is the default administrative distance IGRP routes?&#10;A) 1&#10;B) 20&#10;C) 100&#10;D) 110

Accepted Answer

The answer of What is the default administrative distance IGRP...

Question 17

Which term does OSPF use to describe the special OSPF area to which all other areas must connect?&#10;A) Area border router&#10;B) Backbone area&#10;C) Interarea&#10;D) Area

Accepted Answer

The answer of Which term does OSPF use to describe...

Deck 19: Understanding OSPF Concepts