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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://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 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

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)

CCNA VTP SIM

CCNA EIGRP LAB

Comments
Comment pages
1 12 13 14 23
  1. Anonymous
    August 15th, 2016

    hi guys, I am going to take my exam on 17th. is any of you experienced to have a lab for NAT SIM2? thanks

  2. 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 ???

  3. Oz
    August 17th, 2016

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

  4. 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. 10.10.0.0/18 subnetted with mask 255.255.255.252
    B. 10.10.0.0/25 subnetted with mask 255.255.255.252
    C. 10.10.0.0/24 subnetted with mask 255.255.255.252
    D. 10.10.0.0/23 subnetted with mask 255.255.255.252 D is the only one that can provide you the maximum Host ip addresed with a minimum Waste.
    E. 10.10.0.0/16 subnetted with mask 255.255.255.252

  5. 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?

  6. 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

  7. 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

  8. Extremalzhez
    August 24th, 2016

    there is 6 public ip address 198.18.184.105 198.18.184.110 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 192.0.2.113,,, 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(

  9. Oron David
    September 18th, 2016

    solution: access list is wrong …
    access list should be – access-list 1 permit 198.18.184.105 198.18.184.110

  10. Oron David
    September 18th, 2016

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

  11. 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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    January 11th, 2017

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    January 16th, 2017

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    February 3rd, 2017

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  17. 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!

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