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CCNA NAT SIM Question

January 5th, 2014 Go to comments

Question

You are tasked to configure Internet access on a router. 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.

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”

Tasks:
+ Use NAT to provide Internet access to all hosts in the company LAN.
+ Name the router TUT
+ Inside global addresses: 198.18.184.105 198.18.184.110/29
+ Inside local addresses: 192.168.100.17 – 192.168.100.30/28
+ Numer of inside hosts: 14

NAT_sim_topology.jpg

Solution

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://congressreiki.ranm.org/?all=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 198.18.184.105 to 198.18.184.110/29. Therefore we have to use NAT overload (or PAT)

Double click on the TUT router to open it

Router>enable
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 = 255.255.255.248). 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 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 be translated

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

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 192.168.100.17 to 192.168.100.30, into an address from the pool named mypool (the pool contains addresses from 198.18.184.105 to 198.18.184.110)

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-if)#exit

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

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:

C:\>ping 192.0.2.114

The ping should work well and you will be replied from 192.0.2.114

Comments
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  1. Anonymous
    March 30th, 2019

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  2. hussain
    April 13th, 2019

    why we are ping to this IP address C:\>ping 192.0.2.114

  3. Eric
    April 14th, 2019

    @Hussain the ip 192.0.2.114 is the ip configured on the ISP router that is facing the local device.

  4. Orkhan
    April 16th, 2019

    please please, my email id cabrayilov1992@ mail . ru
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  5. bill
    May 9th, 2019

    if anyone is sitting separate exams, then fyi NAT/PAT questions do not show up in ICND2 exam, they only appear in ICND1. But if you sit combined 200-125, then it will likely show up.

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    May 22nd, 2019

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    May 22nd, 2019

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  8. atcha freeman
    July 12th, 2019

    Hi
    Please I need a help
    I want to get in user mod in my router 1800

    It is giving this message

    dgscnrouter con0 is now available

    Press RETURN to get started

    Please How can I do ?

    thanks

    {email not allowed}

  9. Anonymous
    July 21st, 2019

    ping is working without NAT configurations. why?

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    July 21st, 2019

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    July 23rd, 2019

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    August 13th, 2019

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  14. Me
    August 24th, 2019

    is it ok if we create name for pool / create numbered access list randomly on the real exam ?
    for example, I gonna name it ‘swimmingpool’ and choosing 99 as my number of access list.

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    August 29th, 2019

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    September 12th, 2019

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    September 16th, 2019

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  21. Ross
    November 22nd, 2019

    @9tut i cannot practice this NAT Sim Lab, in fact is this NAT LAB still relevant? does it come in the exam? i am writing tomorrow please help me just wanna know if i also need

  22. Jafar ahmed
    January 12th, 2020

    My exam is january 21, i need new questions 7 which one uploaded this week
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    Please help me it will big help, i dont need dumps i have the all questions only new question 7 i need.

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