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Nat Sim

June 24th, 2011 in LabSim Go to comments


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 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:

– The basic router configuration
– The appropriate interfaces have been configured for NAT inside and NAT outside
– The appropriate static routes have also been configured (since the company will be a stub network, no routing protocol will be required.)
– All passwords have been temporarily set to “cisco”

ccna_nat_sim_lab1 ccna_nat_sim_lab2


Note: If you are not sure about NAT or Access list, my read my NAT tutorial and Access-list tutorial.

The 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 Weaver router to open it

configure terminal

First you should change the router’s name to Weaver

Router(config)#hostname Weaver

Create a NAT pool of global addresses to be allocated with their netmask.

Weaver(config)#ip nat pool mypool netmask

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

Weaver(config)#access-list 1 permit

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

Weaver(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:

Weaver(config)#interface fa0/0
ip nat inside
interface s0/0
ip nat outside

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

Weaver#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

You can download this sim and practice with Packet Tracer here: http://www.9tut.com/download/9tut.com_CCNA_NAT_sim_question.zip

(Notice: you can find other NAT Sim Question here)

Other lab-sims in ICND2 Exam:

VTP SIM (on 9tut.com)

EIGRP Lab sim (on 9tut.com)

Other lab-sims might appear in the real ICND 2 exam, read and understand them if you have enough time!

Comment pages
1 2 3 56
  1. João Felipe
    January 22nd, 2015

    I wonder if the command “ip access-group 1 in”, at interface fa 0/0, is necessary too.

  2. Anonymous
    January 25th, 2015

    question….if you use “wr mem” instead of “copy run start” do you lose credit?

  3. Anon
    January 29th, 2015

    @Oliver, you don’t need that command in this case.

    @Joao, you don’t need that command either when associating the addresses in the ACL with the addresses they will NAT to.

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    February 3rd, 2015

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  5. Anon
    February 6th, 2015

    Hey Guys,

    I’m doing ICND 2 in the next few days. Can someone confirm if this is the exact question?

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    February 8th, 2015

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    February 19th, 2015

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  8. David
    February 23rd, 2015

    Thanks John

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    February 25th, 2015

    Guys can you please email me latest Dumps ICND1 &2? Scheduled test for Saturday Feb 28th.
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  10. bla bla
    March 4th, 2015

    why the hell would NAT be on the ICND2 exam? It’s not even mentioned in the 200-101 book… I literally just checked my book and it’s not even in there. We covered NAT in ICND1… is this really on the the 200-101 exam?

  11. Anonymous
    March 5th, 2015

    Passed ICND2 today with 1000.
    All questions and Labs valid.
    I had EIGRP and FrameRelay Sim

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    March 6th, 2015

    Hi I am taking my icnd 2 in a couple of days time can you send the dumps to me please
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  13. Fagner
    April 22nd, 2015

    hi, guys in the configurations for NAT

    that reports exhibit

    ~Weaver(config)#ip nat pool MYPOOL netmask
    %Pool MYPOOL mask too small; should be at least
    %Start and end addresses on different subnets~

    how configure the range?

  14. maRky
    April 29th, 2015

    Fagner: change command from:
    ip nat pool MYPOOL netmask
    ip nat pool MYPOOL netmask

  15. Disco
    May 25th, 2015

    Has anyone encountered this sim in icnd2 exam in 2015?

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    May 27th, 2015

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  17. Akram Al-Rawi
    June 10th, 2015

    Start and end are on the same subnet

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