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Network Address Translation

1.

Which are considered the methods of NAT?

1.Static

2.IP NAT pool

3.Dynamic

4.NAT double-translation

5.Overload

Answer: C

You can configure NAT three ways on a Cisco router: static, dynamic, and NAT Overload (PAT).

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2.

Which command would you place on interface connected to the Internet?

Answer: B

As in access-lists, you must configure your interfaces before NAT will provide any translations. On the inside networks you would use the command ip nat inside. On the outside interface, you will use the command ip nat outside.

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3.

Which command will show you all the translations active on your router?

Answer: A

The command show ip nat translations will show you the translation table containing all the active NAT entries.

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4.

Which of the following are advantages of using NAT?

1.Translation introduces switching path delays.

2.Conserves legally registered addresses.

3.Causes loss of end-to-end IP traceability.

4.Increases flexibility when connecting to the Internet.

5.Certain applications will not function with NAT enabled.

6.Reduces address overlap occurrence.

Answer: D

NAT is not perfect, but there are some advantages. It conserves global addresses, which allow us to add millions of hosts to the Internet without "real" IP addresses. This provides flexibility in our corporate networks. NAT can also allow you to use the same subnet more than once in the same network without overlapping networks.

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5.

Which of the following is considered to be the destination host before translation?

Answer: B

The host on the global network before translation is considered to be an outside local host.

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6.

Which of the following is considered to be the address before translation?

Answer: A

The host on the private network before translation is considered to be an inside local host.

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7.

Which of the following is considered to be the address after translation?

Answer: C

The host on the private network after translation is considered to be an inside global host.

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8.

Which of the following is considered to be the destination host after translation?

Answer: D

The host on the global network after translation is considered to be an outside global host.

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9.

Which of the following would be a good starting point for troubleshooting if your router is not translating?

Answer: C

In order for NAT to provide translation services, you must have ip nat inside and ip nat outside configured on your router's interfaces.

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10.

Which command will clear all the translations active on your router?

Answer: D

The command clear ip nat translations * will clear all the active NAT entries in your translation table.

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