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New CCNA NAT Simulation Question.

 This is an Updated real CCNA exam question (Oct, 2013). You might see a different IP addressing.
As usual, take time to read through the question soas to clearly understand what Cisco want you to do.
 

Note: This NAT LAB are used for demonstration only,you will see different IP addressing, configuration and Port allocation in the real CCNA exam. But it all works the same way if you could just grasp the technique.

I suggest you use packet tracer for practice.

Download Cisco Packet tracer here

 
 

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.

 
CCNA NAT Simulation Exam
 
 
 
 

 
 

Solution:

 

The above named organisation has 14 hosts that need to access the internet simultaneously but were provided with just 6 public IP addresses from198.18.184.105 to 198.18.184.110/29.

In this case, you have to consider using NAT Overload (or PAT)

Doubleclick on the Weaver router to access the CLI

Router>enable
Router#
configure terminal

Configure the router's name as “Weaver

Router(config)#hostname Weaver
Weaver#
 
Create a NAT pool of global addresses and mask to be assigned.
 
Weaver#configure terminal
Weaver(config)#ip nat pool mypool 198.18.184.105 198.18.184.110 netmask 255.255.255.248
 
Create a standard access control list that permits the addresses that are to betranslated:
 

Weaver(config)#access-list 1 permit 192.168.100.16 0.0.0.15

Set up dynamic address source translation, specifying the access list that was defined in the step above:

Weaver(config)#ip nat inside source list 1 pool mypool overload
Weaver(config)#end
Weaver#copyrunning-config startup-config   (dont forget this bit)

This command translates all source addresses that meets access list 1 criteria, source address from 192.168.100.17 - 192.168.100.30,will be translated into addresses from the pool ( mypool) (addresses 198.18.184.105 to 198.18.184.110)

Overload: using this keyword enables the router to map multiple IP addresses to a single registered IP address (many-to-one) using different port. It can also be call Port Address Translation- PAT

note: according to the question, “..Appropriate interfaces have been configured for NAT inside and NAT outside.”

This means that NAT inside and NAT outside is already configured. You might be lucky to encounter this during your exam or not. For the record, this is how to configure the NAT inside and NAT outside,

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 (this saves all your configuration,don’t forget! )


verify your configuration by pinging from  "Host for testing":

C:>ping 192.0.2.114

If you follow the above configuration, you should receive a reply.



 

 
 
 


 
 
 
 
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