Answers: IPv4 Addresses 4

By certskills August 13, 2014 09:05

By the time go for #CCENT with the ICND1 exam, this kind of exercise should be relatively automatic. The goal here is to help you practice, so that it becomes second nature.  Today’s post shows the answers; useful links below, with the answers below the fold! As always, try these Config Labs yourself first, even if it’s just on a piece of paper or in a text editor.


Your first task was to calculate the IP addresses to use, based on requirements. For reference, Table 1 lists the results. Note that all subnets sit in class A network, but several use different masks, so this design happens to use Variable Length Subnet Masking (VLSM).

Table 1: IPv4 Addresses

Location IP/mask
R1 G0/0 /29
R1 G0/1 /28
R1 G0/4 23
R2 G0/0 /29
R2 G0/1 /28
R2 G0/4 /23
R3 G0/0 /28
R3 G0/1 /28
R3 G0/4 /23


To create the configuration, all you have to do is add the ip address command to each interface in configuration mode. Easy once you’d done it a few times; here are the answers to be complete.

Example 1: R1 IPv4 Address Configuration


Example 2: R2 IPv4 Address Configuration

Example 3: R3 IPv4 Address Configuration



IPv4 Addresses 4
Config Museum: OSPFv2 Single-area
By certskills August 13, 2014 09:05
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  1. Bav July 2, 10:26

    Got these nailed in a few mins.

    Reply to this comment
  2. 4lban October 3, 14:53

    Last row should be /23 instead of /28
    By the way, these exercises are very helpful.

    Reply to this comment
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