#CCNA Tshoot Config Exercise – Answers

Today’s post simply shows the answers to the previous post. At the same time, the answer in today’s post is the basis for the next post’s type of troubleshooting practice question. So, check out the previous post for the question, and today’s post for the answer!

Earlier posts in this series:

CCNA Troubleshooting Self-study Exercises

Constructing CCNA Config Drills for Troubleshooting Practice

Plain and Simple: IPv4 Addressing Plan

The question first required that you calculate the IPv4 subnets, pick the numerically lowest six subnet IDs, and then assign IP addresses from that set. Figure 1 shows a reminder of where subnets 1 through 6 sit in the figure, followed by Table 1, which lists the chosen subnet IDs and router IP addresses in each subnet.

Figure 1 – Location of IPv4 Subnets

Table 1 – IPv4 Addressing Plan

R1 Configuration

Per the requirements listed in the previous post, R1 needs the following configuration.

Example 1: R1 Configuration

interface FastEthernet0/0
 ip address 172.16.0.1 255.255.254.0
 duplex auto
 speed auto
 no shutdown
!
interface Serial0/0/0
 ip address 172.16.6.1 255.255.254.0
 clock rate 1536000
 no shutdown
!
interface Serial0/0/1
 ip address 172.16.8.1 255.255.254.0
 clock rate 1536000
 no shutdown
!
router ospf 1
 router-id 1.1.1.1
 network 172.16.0.0 0.0.1.255 area 0
 network 172.16.6.0 0.0.1.255 area 0
 network 172.16.8.0 0.0.1.255 area 0

If you added extra configuration for other features, that’s fine, but when creating your own exercises, it helps to write down the requirements. For example, if you configured a console, telnet, and enable password, then note the requirement.

R2 Configuration

Per the requirements listed in the previous post, R2 needs the following configuration.

Example 2: R2 Configuration

interface FastEthernet0/0
 ip address 172.16.2.2 255.255.254.0
 duplex auto
 speed auto
 no shutdown
!
interface Serial0/0/0
 ip address 172.16.10.2 255.255.254.0
 clock rate 1536000
 no shutdown
!
interface Serial0/0/1
 ip address 172.16.6.2 255.255.254.0
 no shutdown
!
router ospf 1
 router-id 2.2.2.2
 network 172.16.2.0 0.0.1.255 area 0
 network 172.16.6.0.0 0.0.1.255 area 0
 network 172.16.10.0 0.0.1.255 area 0

R3 Configuration

Per the requirements listed in the previous post, R3 needs the following configuration.

Example 3: R3 Configuration

interface FastEthernet0/0
 ip address 172.16.4.3 255.255.254.0
 duplex auto
 speed auto
 no shutdown
!
interface Serial0/0/0
 ip address 172.16.8.3 255.255.254.0
 clock rate 1536000
 no shutdown
!
interface Serial0/0/1
 ip address 172.16.10.3 255.255.254.0
 no shutdown
!
router ospf 1
 router-id 3.3.3.3
 network 172.16.4.0 0.0.1.255 area 0
 network 172.16.8.0.0 0.0.1.255 area 0
 network 172.16.10.0 0.0.1.255 area 0

More Like this in the Config Museum

Both my CCENTSkills and CCNASkills blogs have some exercises already posted that mirror the kinds of requirements and solutions seen in this post and the previous post. Just look for the configuration museum links at the top of the pages, and browse.

Tshoot Exercise Next Post

Next post, I’ll show how to easily create some self-study exercises for yourself based on your finished configuration answers. Later…