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NAT Questions

August 25th, 2015 in ROUTE 300-101 Go to comments

Question 1

Question 2


First we will not mention about the effect of the “extendable” keyword. So the purpose of the command “ip nat inside source static tcp 80 8080” is to translate packets on the inside interface with a source IP address of and port 80 to the IP address with port 8080. This also implies that any packet received on the outside interface with a destination address of has the destination translated to Therefore answer C is correct.

Answer A is not correct this command “allows host to access external websites using TCP port 80”, not port 8080.

Answer B is not correct because it allows external clients to connect to a web server at The IP addresses of clients should not be

Answer D is not correct because the configuration is correct.

Now we will talk about the keyword “extendable”.

Usually, the “extendable” keyword should be added if the same Inside Local is mapped to different Inside Global Addresses (the IP address of an inside host as it appears to the outside network). An example of this case is when you have two connections to the Internet on two ISPs for redundancy. So you will need to map two Inside Global IP addresses into one inside local IP address. For example:


NAT router:
ip nat inside source static extendable
ip nat inside source static extendable
//Inside Local: ; Inside Global: &

In this case, the traffic from ISP1 and ISP2 to the Server is straightforward as ISP1 will use and ISP2 will use to reach the Server. But how about the traffic from the Server to the ISPs? In other words, how does NAT router know which IP ( or it should use to send traffic to ISP1 & ISP2 (this is called “ambiguous from the inside”). We tested in GNS3 and it worked correctly! So we guess the NAT router compared the Inside Global addresses with all of IP addresses of the “ip nat outside” interfaces and chose the most suitable one to forward traffic.

This is what Cisco explained about “extendable” keyword:

“They might also want to define static mappings for a particular host using each provider’s address space. The software does not allow two static translations with the same local address, though, because it is ambiguous from the inside. The router will accept these static translations and resolve the ambiguity by creating full translations (all addresses and ports) if the static translations are marked as “extendable”. For a new outside-to-inside flow, the appropriate static entry will act as a template for a full translation. For a new inside-to-outside flow, the dynamic route-map rules will be used to create a full translation”.

(Reference: http://www.cisco.com/en/US/technologies/tk648/tk361/tk438/technologies_white_paper09186a0080091cb9.html)

But it is unclear, what will happen if we don’t use a route-map?

Question 3


The command “ip nat inside source list 1 int s0/0 overload” translates all source addresses that pass access list 1, which means all the IP addresses, into an address assigned to S0/0 interface. Overload keyword allows to map multiple IP addresses to a single registered IP address (many-to-one) by using different ports.

Question 4


The command “ip nat inside source list 10 interface FastEthernet0/1 overload” configures NAT to overload on the address that is assigned to the Fa0/1 interface.

  1. route
    February 5th, 2016

    I think this is new Updated.

  2. i
    February 12th, 2016

    yah its the latest update

  3. anom
    March 14th, 2016

    How come question 4: Which command allows hosts that are connected to FastEthernet0/2 to access the Internet?

    But the answer is: A. ip nat inside source list 10 interface FastEthernet0/1 overload

    instead of

    C. ip nat inside source list 10 interface FastEthernet0/2 overload ???

  4. conan
    March 22nd, 2016

    because ip nat INSIDE source list translates the source of IP packets that are traveling inside to outside, your inside address is the private ip which resides on port FE0/2 and your outside address is the public ip which is on FE0/1.
    so the correct answer is
    A. ip nat inside source list 10 interface FastEthernet0/1 overload

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    April 30th, 2016

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    May 30th, 2016

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  7. Jarel
    July 7th, 2016

    For question 4 … C is correct as stated.

    Source list 10 specifies local addresses.

    interface FastEthernet0/1 specifies the global address.

    Therefore this is Natting Inside to outside.

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    July 27th, 2016

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    September 19th, 2016


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    October 4th, 2016

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    November 6th, 2016

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  15. CCNP
    November 12th, 2016

    referring to end of the q1 and q2. I thing the packet forwarding it not the job of the NAT this is routing process job “static or dynamic” whatever the roting process decision is the NAT process will translate the result. I mean the NAT translation job comes after the routing process function

  16. CCNP
    November 12th, 2016

    or in this case why not using the pool with PAD as we did with the dynamic NAT

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    November 17th, 2016

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    November 17th, 2016

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  20. Anonymous
    December 2nd, 2016

    router(config)# ip nat inside source static tcp 8080 80
    Which statement about the command is true?????????

  21. Bad
    December 5th, 2016

    Hello It’s totally a different exam and the questions provided above is provided on the exam.
    and Anonymous i faced the same question today that which is not provided in any dumps questions.

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    December 12th, 2016

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    December 14th, 2016

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  26. Anonymous
    December 21st, 2016

    refer tot he following command router(config)#ip nat inside source static tcp 8080 80
    on this command is the 8080 going to be translated to 80 or vise versa

  27. MaxZero
    December 27th, 2016


    This answer in the TAGWA – TAGELSIR DUMPS is WRONG.

    please have a look at this document:

    Any packet received in the inside interface with a source address of is translated to
    This also implies that any packet received on the outside interface with a destination address of has the destination translated to

    So the answer is B.
    Make sure you understand the whole concept of NAT port redirection and do not just focus on memorizing the answer, as things may differ in the exam, e.g. they can replace ‘inside’ with ‘outside’ and the answer will then be different.

  28. Anonymous
    January 4th, 2017

    thank you Max

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    January 10th, 2017

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  30. dfdfds
    January 25th, 2017


  31. Anonymous
    January 25th, 2017

    exam has been update 10 or 5 new Q

  32. Anonymous
    February 1st, 2017

    Is the 183q worth looking at, or stick to TAGWA and 149q????

  33. Anonymous
    February 2nd, 2017

    Anonymous i took a look at the 183 and now i’m confused buddy

  34. Anonymous
    February 10th, 2017

    Someone please explain this to me. In the 32q set of questions, they show this command:

    ip nat inside source static tcp 8080 80

    The answer is “Any packet received in the inside interface with a source IP port address of is translated to”

    The other answer is almost identical, but it leaves a space between the IP and port#:

    “Any packet received in the inside interface with a source IP port address of 8080 is translated to 80”

    Why aren’t both technically correct? Why is the first answer correct and the other not correct???

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