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New Cisco ICND Exam Questions: NAT Sim.

 
 
 
 

This is an Updated real CCNA exam question (October, 2013). You might see a different IP addressing, VLAN configuration and Port allocation and Configurations.

As usual, take time to read through the question so as to clearly understand what Cisco want you to do.

Note: NAT Sim is used for demonstration only; you might see different IP addressing and Port allocation in the real ICND exam. But it all works the same way if you could just understand the technique.

I suggest you use packet tracer for practice.

 
Question:

A network associate is configuring a router for the weaver company to provide internet access. The ISP has provided the company six public IP addresses of 198.18.184.105 198.18.184.110. The company has 14 hosts that need to access the internet simultaneously. The hosts in the company LAN have been assigned private space addresses in the range of 192.168.100.17 – 192.168.100.30.

 
 
 
Cisco ICND NAT Sim Exam
 

The company has 14 hosts that need to access the internet simultaneously but were issued with just 6 public IP addresses from 198.18.184.105 to 198.18.184.110/29. To accomplish this we use NAT overload or PAT (Port address Translation )

Double click on the Weaver router to access the CLI

Use the following command:

Router>enable
Router#configure terminal

1. Change the router's or host name to
Weaver

Router(config)#hostname Weaver

2. Create a NAT pool of global IP addresses to be assigned

Weaver(config)#ip nat pool mypool 198.18.184.105 198.18.184.110 netmask 255.255.255.248
 
(/29 is the prefix of 248)

3. Create a standard access control list that permits the addresses that are to be translated.

Weaver(config)#access-list 1 permit 192.168.100.16 0.0.0.15
 
(0.0.0.15 is the wildcard mask of 240 or prefix /28)


Establish dynamic source translation, specifying the access list that was created.

Weaver(config)#ip nat inside source list 1 pool mypool overload

The above command translates all source addresses that are permited by the access list 1. Source addresses from 192.168.100.17 to 192.168.100.30, from the pool ip address named mypool .

Overload keyword allows to map multiple IP addresses to a single registered IP address by using different ports. It can also be called Port Address Translation (PAT)

According to the question, the appropriate interface had been configured with NAT inside and NAT outside. But, below is how to confugure NAT inside and NAT outside in case you've forgotten:

Weaver(config)#interface fa0/0
Weaver(config-if)#ip nat inside
Weaver(config-if)#exit

Weaver(config)#interface s0/0
Weaver(config-if)#ip nat outside
Weaver(config-if)#end

Weaver#copy running-config startup-config (dont forget this bit)

Check your configuration for connectivity, click on “host for testing” and type

C:>ping 192.0.2.114

If your configuration is correct, there will be reply from 192.0.2.114

    

 
 
 


 
 
 
 
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