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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://www.9tut.com/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

Other lab-sims on this site:

CCNA NAT SIM Question 1

CCNA NAT SIM Question 2

CCNA Frame Relay Sim

CCNA Configuration SIM Question (RIPv2 SIM)



Comment pages
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  1. herry
    August 16th, 2016

    hi guys, nat lab is a part of ccna exam?? somebody tell me only access-list lab is the part of exam … is it true ???

  2. Oz
    August 17th, 2016

    Passed today, 850/1000 OSPF and EGRIP, ACL Mod 4, and also ACL sims. 40 questions, tough fair.

  3. Raj
    August 17th, 2016

    The correct answer is D, and this is why
    you have been asked 113 point to point link, that means you need only 2 IP addresses for each Point to point. to get that the minimum you can go is /30 which means each link will get 2 usable address and one broadcast and one network ID.
    if that is the case. just make a guest if you have 4 ip address for each Link, how many ip addresses you will need for 113? hmmmm that will be 452 ip addresses.

    If you look the 4 answers you have
    A. subnetted with mask
    B. subnetted with mask
    C. subnetted with mask
    D. subnetted with mask D is the only one that can provide you the maximum Host ip addresed with a minimum Waste.
    E. subnetted with mask

  4. JC
    August 17th, 2016

    Would it be wise to not name the nat pool “mypool”? Does it matter what I name it on the test?

  5. Ronald Kgosimore
    August 20th, 2016

    Thanks to 9tut,
    i passed my exam 900 on 19 August 2016@ Botswana,
    exam was fear..

    ACL 2 (Mode 3)
    New EIGRP answers
    OSPF same

    Watson valid…good luck guys

  6. Anonymous
    August 23rd, 2016

    Passed my CCNA on 20th aug2016 with 96.1%.
    Thanks to 9tut… you guys are doing a great job..
    thanxs a lot

  7. Extremalzhez
    August 24th, 2016

    there is 6 public ip address and we have 14 hosts so how they all can access to the internet there are only six hosts to access on internet with six public address then when translations over public ip adressses going to in the pool? and how they access to the internet when we dont have any ip public ip addresses in the router interfaces??? only 1 int have,,, explain someone please!, we need to to have any ip address in the pool on router interfaces or its doesn’t matter??? how this pool work if we dont sign into interface?
    sorry for my bad english guyes:((( feel bad now(

  8. Oron David
    September 18th, 2016

    solution: access list is wrong …
    access list should be – access-list 1 permit

  9. Oron David
    September 18th, 2016

    Extremalzhez because of the “overload” command
    NAT overloading = PAT

  10. Anonymous
    January 10th, 2017

    I know this is out of topic, i just pass my CCNA last Oct., thanks to 9tut. Now i need to take certification exam for microsoft Exam 70-334: Core Solutions of SfB 2015. do you guys know any site as reliable as 9tut for microsoft exam??

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  13. kasy
    January 11th, 2017

    guys what are main topics in ccna 200-125
    want to write tomorw

  14. jim
    February 3rd, 2017

    please can some one confirm CCDA dumps validty?????

  15. FreshSent
    February 21st, 2017

    Just passed CCNA 200-125 within the last week. I took the Cisco networking Academy courses 1-4 and was able to get my hands on actual hardware to practice on; although this got me really proficient at configuring networks, the 9tut sims greatly improved my chance of passing. I also used the 171q by Penpinapplepen which was also a significant help. The Cisco Academy labs are great for learning and applying Cisco networking task, but did not thoroughly prepare me for the CCNA exam. The exam seemed to go into technical detail in regards to some of the basic networking operations. I’m the type of person who learns from hands-on training; its easy for me to configure things like routing protocols ,etherchannel, HSRP etc.., Cisco had good videos for that, but things like STP or syslog not so much. The topics of the exam are not hard to learn without Cisco Net-Academy, but the way the questions are worded is what made 9tut and penpinapplepen essential to my preparation. Don’t just rely on 9tut sims and dumps, do your best to learn the material. Without knowledge the cert is as good as toilet paper… actually, toilet paper would be more useful. GOOD LUCK EVERYONE!

  16. KK
    February 28th, 2017

    Hi , Can someone please share the questions please?

  17. anhkd
    March 12th, 2017

    Why /29????

  18. me
    March 30th, 2017

    hy guys….type of device replaced by subinterface for vlan routing??
    A.layer 3 switch

  19. me
    March 30th, 2017

    plz i need the correct answer guys

  20. lucky
    April 4th, 2017

    hi all,

    please tell which labs changed in the exam ?

    which labs same in the exam ?

    plz answer ?

  21. required urgently
    April 10th, 2017

    can anyone send me the latest CCNA 200-125 valid dumps along with the labs,please also request for those students who had just passed the exam.

    Email: {email not allowed}

  22. required urgently
    April 10th, 2017

    email not allowed ,please mention any link which is valid.

  23. ccnapre
    April 21st, 2017

    Is the lab valid? I am not able to ping with the configuration mentioned here.

  24. ahmad
    April 21st, 2017

    yes it binging but you have to enter defulte route in both ISP router and TUT router
    TUT(config)#ip route s0/0
    ISP(config)#ip route

    and then it will work …

  25. Anonymous
    April 24th, 2017

    can anyone send me the latest CCNA 200-125 valid dumps along with the labs


  26. Anonymous
    April 28th, 2017

    thanks! I was able to build the topology even did troubleshooting on the application of ACL, PAT and Dynamic NAT, Default Static Route, and basics of routing.

    build the ISP topology and applied standard ACL to block the private IP behind the TUT router.

  27. MKNK
    May 2nd, 2017

    CCNA has changed. Don’t depend on dumps only as on-the-job experience is vital. Got 15 new questions on dhcp, pagp, ipv6 and others, eigrp sim, access-list sim. I was very fortunate, scored 820.

  28. helpfull guys
    May 12th, 2017

    can anyone send me the latest CCNA 200-125 valid dumps along with the labs


  29. Anonymous
    May 12th, 2017

    please explain how actual sim works in the exam?. is there any simulation site for this?

    Can we tab the commands?

    as an example we Used to type Conf t for the configure terminal command, can we do the same in exam sims?

  30. Anonymous
    May 14th, 2017

    can someone please explain to me where he got on command line 5 form?especially the .16 from the ip address and

  31. Anonymous
    May 16th, 2017

    can anyone send me the latest CCNA 200-125 valid dumps along with the labs
    {email not allowed}

  32. Anonymous
    May 16th, 2017

    can anyone send me the latest CCNA 200-125 valid dumps along with the labs

  33. shekar
    June 1st, 2017

    Hi guys, I am new to 9tut having hard time in finding the simulator .Can some help me in finding sim link please ?

  34. adeayo
    June 28th, 2017

    Can any one help me with a latest dump my email is {email not allowed}

  35. Slim
    July 11th, 2017

    Hi evrybody,
    Could you please share with me the latest valid dump on this address: basly.mohamed.slim(@)gmail(dot)com.
    i’m passing the exam on the 25th of this month. i really need your help.
    Thanks and regards.

  36. Shahi
    July 12th, 2017

    Hi everyone one,

    Can any one tell me How the SIM works during exam do we need to telnet the connected Router/Switch from one terminal?
    Or we can login saperately each device?

  37. saif
    July 22nd, 2017

    Hi evrybody,
    Could you please share with me the latest valid dump on this address:

  38. maxwell
    August 13th, 2017

    Any chance someone could send me the latest CCNA 200-125 dumps at: {maxwellvmx @ gmail .com}

  39. Sudhan
    August 26th, 2017

    Please send latest ccna dump to sudhan_m at yahoo dot co dot in

  40. Anonymous
    September 11th, 2017


  41. JS
    September 18th, 2017

    I am preparing for CCNA routing and switching. Please let me know where should i get the dump. My email is junurajbanshi @ hotmail .com

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