Cisco CCNA OSPF Configuration Guide

Configure OSPF and Add Network 10.1.1.0/24 to Area 0

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Question

What command sequence will configure a router to run OSPF and add network 10.1.1.0 /24 to area 0?

Answers

Explanations

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A. B. C. D. E. F.

C

The correct command sequence to configure a router to run OSPF and add network 10.1.1.0 /24 to area 0 is:

C. router ospf 1 network 10.1.1.0 0.0.0.255 area 0

Here is a breakdown of each command:

  1. router ospf 1: This command enables OSPF routing process and sets the process ID to 1.

  2. network 10.1.1.0 0.0.0.255: This command adds the network 10.1.1.0 /24 to the OSPF process. The "0.0.0.255" is a wildcard mask that matches any IP address in the 10.1.1.0/24 subnet.

  3. area 0: This command specifies that the network 10.1.1.0/24 should be placed in OSPF area 0, which is the backbone area for OSPF.

Therefore, the complete command sequence is: router ospf 1 network 10.1.1.0 0.0.0.255 area 0.

Let's go through the other answer options:

A. router ospf area 0 network 10.1.1.0 255.255.255.0 area 0: This command sequence has the correct network statement and area specification but uses an incorrect subnet mask (255.255.255.0 instead of 0.0.0.255).

B. router ospf network