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NAT Questions

March 16th, 2020 Go to comments

Question 1

Question 2

Explanation

Maybe this question wanted to ask “which IP address is the source IP at the receiving side?” as there are two correct answers for inside local IP address (10.4.4.4 & 10.4.4.5) so they cannot be the correct answer.

NAT_terms_explained.jpg

Question 3

Explanation

By adding the keyword “overload” at the end of a NAT statement, NAT becomes PAT (Port Address Translation). This is also a kind of dynamic NAT that maps multiple private IP addresses to a single public IP address (many-to-one) by using different ports. Static NAT and Dynamic NAT both require a one-to-one mapping from the inside local to the inside global address. By using PAT, you can have thousands of users connect to the Internet using only one real global IP address. PAT is the technology that helps us not run out of public IP address on the Internet. This is the most popular type of NAT.

An example of using “overload” keyword is shown below:

R1(config)# ip nat inside source list 1 interface ethernet1 overload

Question 4

Explanation

NAT use four types of addresses:

* Inside local address – The IP address assigned to a host on the inside network. The address is usually not an IP address assigned by the Internet Network Information Center (InterNIC) or service provider. This address is likely to be an RFC 1918 private address.
* Inside global address – A legitimate IP address assigned by the InterNIC or service provider that represents one or more inside local IP addresses to the outside world.
* Outside local address – The IP address of an outside host as it is known to the hosts on the inside network.
* Outside global address – The IP address assigned to a host on the outside network. The owner of the host assigns this address.

NAT_terms_explained.jpg

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