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NAT Questions

January 28th, 2021 Go to comments

Question 1

Explanation

The command “ip nat inside source list 1 interface gigabitethernet0/0 overload” translates all source addresses that pass access list 1, which means 172.16.1.0/24 subnet, into an address assigned to gigabitethernet0/0 interface. Overload keyword allows to map multiple IP addresses to a single registered IP address (many-to-one) by using different ports so it is called Port Address Translation (PAT).

Question 2

Explanation

In this question, the inside local addresses of the 10.1.1.0/27 subnet are translated into 209.165.201.0/27 subnet. This is one-to-one NAT translation as the keyword “overload” is missing so in fact answer B is also correct.

Question 3

Explanation

The syntax of NAT command is ip nat inside source static local-ip global-ip so we can deduce the first IP address is the local IP address where we apply “ip nat inside” command and the second IP address is the global IP address where we apply “ip nat outside” command.

Question 4

Explanation

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.

Question 5

Explanation

The command “ip nat inside source list 10 interface G0/3 overload” configures NAT to overload (PAT) on the address that is assigned to the G0/3 interface.

Comments
  1. HM
    April 14th, 2021

    Q2

    Answer here and in the PDF don’t match, please check it.

  2. Anonymous
    May 10th, 2021

    Admin please check the question 3 seems like it has some error answer A and B both are same.

  3. digitaltut
    May 10th, 2021

    @Anonymous: Answer A is “pat” while answer B is “nat” so they are different.

  4. Anonymous
    May 13th, 2021

    Thank you Admin! just realized sorry I was kind of lost that day studied many hours. Thank you for keeping this website up to date. very helpful.

  5. Mason Ella
    June 28th, 2021

    Try out all the NAT Questions and Answers for Exam. First of all check the Question and Answers demo please.

  6. Anonymous
    July 3rd, 2021

    Q1. “A” cannot be a correct answer.

    A. Inside source addresses are translated to the 209.165.201.0/27 subnet

    The network 209.165.201.0/27 is a range from 209.165.201.0 to .31, but the pool CISCO contains addresses from .1 to .30

  7. Werewolf
    July 3rd, 2021

    Q2
    Refer to the exhibit. What are two effect of this configuration? (Choose two)
    access-list 1 permit 10.1.1.0 0.0.0.31
    ip nat pool CISCO 209.165.201.1 209.165.201.30 netmask 255.255.255.224
    ip nat inside source list 1 pool CISCO
    A. Inside source addresses are translated to the 209.165.201.0/27 subnet
    B. It establishes a one-to-one NAT translation
    C. The 10.1.1.0/27 subnet is assigned as the inside global address range
    D. The 209.165.201.0/27 subnet is assigned as the outside local address range
    E. The 10.1.1.0/27 subnet is assigned as the inside local addresses

    “A cannot be a correct answer! The network 209.165.201.0/27 is a range of all addresses from .0 to .31, but the pool Cisco is a range from .1 to .30
    You have to choice B and E

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