Question 1

Scenario:
AAA is configuring OSPF on Router A and needs to assign it to Area 0. She configures the following:

R1(config)# router ospf 1  
R1(config-router)# network 10.1.1.0 0.0.0.255 area 0
AAA asks BBB for help, but BBB notices that the router's interfaces connected to the 172.16.0.0/16 network are not included in the OSPF configuration.

Question:
What command should AAA add to ensure that OSPF covers the 172.16.0.0/16 network?

Accepted Answer

R1(config-router)# network 172.16.0.0 0.0.255.255 area 0

Answer

R1(config-router)# network 172.16.0.0 0.0.0.0 area 0

Answer

R1(config-router)# network 172.16.0.0 0.0.0.255 area 0

Answer

R1(config-router)# network 172.16.0.0 255.255.0.0 area 0

Question 2

Scenario:
Just like in Taylor Swift's song "All Too Well", where she sings "Maybe we got lost in translation, maybe I asked for too much," sometimes routers in a network can get "lost" and fail to form OSPF neighbor relationships. BBB is feeling the same kind of frustration when her OSPF routers aren’t forming an adjacency.

Question:
What could be causing BBB's routers to feel "lost in translation" and fail to form an OSPF neighbor adjacency?

Accepted Answer

Mismatched area ID

Answer

Matched Hello and Dead timers

Answer

Matched subnet masks

Answer

Incorrect access lists

Question 3

Scenario:
CCC has just completed the OSPF configuration on Router C and wants to ensure that the configuration is correct. AAA suggests using the show ip protocols and show ip ospf neighbor commands.

Question:
What information will CCC find using these commands, and why are they important for verifying OSPF?

Accepted Answer

OSPF process ID, networks being advertised, and routing information; to verify that OSPF is correctly configured.

Answer

The status of all physical and virtual interfaces; to verify interface connectivity.

Answer

A summary of all routes learned via EIGRP; to troubleshoot connectivity issues.

Answer

A list of MAC addresses assigned to each switch interface; to check if interfaces are correctly configured.

Question 4

Scenario:
AAA is setting up OSPF for Router A, and she needs to configure it to include the network 192.168.1.0/24. BBB notices that AAA is unsure about the correct wildcard mask.

Question:
What wildcard mask should AAA use for the network 192.168.1.0/24, and why?

Accepted Answer

0.0.0.255 because the wildcard mask is the inverse of the subnet mask.

Answer

255.255.0.0 because it is a class C network.

Answer

255.255.255.0 because it's a /24 subnet mask.

Answer

0.0.255.255 because it is a class B network.

Question 5

What is checked during OSPF network discovery to establish neighbors?

Accepted Answer

All of the above

Answer

OSPF area

Answer

HELLO and DEAD timers

Answer

Subnet mask

Question 6

How is the best path selected in OSPF?

Accepted Answer

Shortest path first (Dijkstra algorithm)

Answer

Random selection

Answer

Longest path first

Answer

Round-robin selection

Question 7

What is the purpose of a Wildcard Mask in OSPF?

Accepted Answer

To indicate which part of the IP address will be examined

Answer

To configure OSPF areas

Answer

To prevent OSPF network discovery

Answer

To hide the router's identity

Question 8

How is a Wildcard Mask related to a Subnet Mask in OSPF?

Accepted Answer

Wildcard Mask is the inverted of Subnet Mask

Answer

Wildcard Mask is not used in OSPF

Answer

Subnet Mask is not used in OSPF

Answer

They are the same thing

Question 9

How should you configure OSPF for a directly connected network?

Accepted Answer

Use the "network" statement in OSPF configuration

Answer

Use the "ip ospf" command

Answer

Use the "ospf network" command

Answer

Use the "configure ospf" command

Question 10

Does the Process ID number need to match on all routers in the OSPF network?

Accepted Answer

No

Answer

Yes

Answer

Only for backbone routers

Answer

Only in specific areas

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