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January 5th, 2014 Go to comments


You are tasked to configure Internet access on a router. The ISP has provided the company six public IP addresses of 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 –

The following have already been configured on the router:

– Router basic configuration
– Interfaces have been configured for NAT inside (Fa0/0) and NAT outside (s0/0)
– The appropriate static routes have also been configured
– All passwords have been temporarily set to “cisco”

+ Use NAT to provide Internet access to all hosts in the company LAN.
+ Name the router TUT
+ Inside global addresses:
+ Inside local addresses: –
+ Numer of inside hosts: 14



Note: If you are not sure how NAT & PAT work, please read my Network Address Translation NAT Tutorial. You can download this sim to practice here: http://juquitiba.sp.gov.br/?exams=download/9tut.com_CCNA_NAT_sim_question.zip

The CCNA Training company has 14 hosts that need to access the internet simultaneously but we just have 6 public IP addresses from to Therefore we have to use NAT overload (or PAT)

Double click on the TUT router to open it

Router#configure terminal

First you should change the router’s name to TUT

Router(config)#hostname TUT

Create a NAT pool of global addresses to be allocated with their netmask (/29 = There were reports that the simulator in the real exam did not accept “prefix-length” keryword so you should use “netmask” keyword.

TUT(config)#ip nat pool mypool netmask

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

TUT(config)#access-list 1 permit

Establish dynamic source translation, specifying the access list that was defined in the prior step

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

This command translates all source addresses that pass access list 1, which means a source address from to, into an address from the pool named mypool (the pool contains addresses from to

Overload keyword allows to map multiple IP addresses to a single registered IP address (many-to-one) by using different ports

The question said that appropriate interfaces have been configured for NAT inside and NAT outside statements.

This is how to configure the NAT inside and NAT outside, just for your understanding:

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


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

Finally, we should save all your work with the following command:

TUT#copy running-config startup-config

Check your configuration by going to “Host for testing” and type:


The ping should work well and you will be replied from

Comment pages
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    June 28th, 2018

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    August 25th, 2018

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  14. netmask
    September 19th, 2018

    what if I used the netmask ?

  15. navski
    September 27th, 2018

    THis question was on the exam 29/09/2018

  16. eric
    September 27th, 2018

    I wonder why the ACL was not applied to the interface. I though that creating ACL will not be enough until you assign in to interface (access-group in or out)

  17. thundercat
    October 6th, 2018

    after creating the …”access-list 1 ” to permit these adresses, does this access list need to be then applied to an interface?

  18. thuundercat
    October 6th, 2018

    ok. I see now access list 1 is applied when you use the cmd ” ip nat inside source list 1 pool mypool overload”

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  20. nat251
    October 26th, 2018

    its not correct to use netmask, it put the range of ip in two different subnet, use netmask instead.
    ip nat pool mypool netmask

  21. Lucy
    October 31st, 2018

    Nat251 Do the math. It is correct.

  22. ab
    November 19th, 2018

    in the command “access-list 1 permit” the wildcard mask is written as
    but for /29 wildcard mask should be
    so am confused please any one help

  23. seel
    November 28th, 2018


    /28 mask not /29 .

    255 – 240 = 15 .

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