CCNA Practice Questions Final Network Address Translation (NAT)

Which of the following are methods of NAT? (Choose three.) A. Static B. IP NAT pool C. Dynamic D. NAT double‐translation E. Overload

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

Which of the following are disadvantages of using NAT? (Choose three.) A. Translation introduces switching path delays. B. NAT conserves legally registered addresses. C. NAT causes loss of end‐to‐end IP traceability. D. NAT increases flexibility when connecting to the Internet. E. Certain applications will not function with NAT enabled. F. NAT reduces address overlap occurrence.

A. Translation introduces switching path delays. C. NAT causes loss of end‐to‐end IP traceability. E. Certain applications will not function with NAT enabled. NAT is not perfect and can cause some issues in some networks. In most networks, it works just fine. NAT can cause delays and troubleshooting problems, and some applications just won't work with it.

Which command will show you all the translations active on your router? A. show ip nat translations B. show ip nat statistics C. debug ip nat D. clear ip nat translations *

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

Which of the following are advantages of using NAT? (Choose three.) A. Translation introduces switching path delays. B. NAT conserves legally registered addresses. C. NAT causes loss of end‐to‐end IP traceability. D. NAT increases flexibility when connecting to the Internet. E. Certain applications will not function with NAT enabled. F. NAT remedies address overlap occurrence.

B. NAT conserves legally registered addresses. D. NAT increases flexibility when connecting to the Internet. F. NAT remedies address overlap occurrence. NAT is not perfect, but there are some advantages. It conserves global addresses, allowing 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.

Which command will create a dynamic pool named Todd that will provide you with 30 global addresses? A. ip nat pool Todd 171.16.10.65 171.16.10.94 net 255.255.255.240 B. ip nat pool Todd 171.16.10.65 171.16.10.94 net 255.255.255.224 C. ip nat pool todd 171.16.10.65 171.16.10.94 net 255.255.255.224 D. ip nat pool Todd 171.16.10.1 171.16.10.254 net 255.255.255.0

B. ip nat pool Todd 171.16.10.65 171.16.10.94 net 255.255.255.224 The command ip nat pool name creates the address pool that hosts can use to get onto the global Internet. What makes option B correct is that the range 171.16.10.65 through 171.16.10.94 includes 30 hosts, but the mask has to match 30 hosts as well, and that mask is 255.255.255.224. Option C is wrong because there is a lowercase t in the pool name. Pool names are case sensitive.

When creating a pool of global addresses, which of the following can be used instead of the netmask command? A. / (slash notation) B. prefix-length C. no mask D. block-size

B. prefix-length Instead of the netmask command, you can use the prefix-length length statement.

Which command will show you the summary of the NAT configuration? A. show ip nat translations B. show ip nat statistics C. debug ip nat D. clear ip nat translations * E. clear ip nat sh config sum

B. show ip nat statistics The show ip nat statistics command displays a summary of the NAT configuration as well as counts of active translation types, hits to an existing mapping, misses (an attempt to create a mapping), and expired translations. *

Which of the following would be a good starting point for troubleshooting if your router is not translating? A. Reboot. B. Call Cisco. C. Check your interfaces for the correct configuration. D. Run the debug all command.

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

Which command will allow you to see real‐time translations on your router? A. show ip nat translations B. show ip nat statistics C. debug ip nat D. clear ip nat translations *

C. debug ip nat The command debug ip nat will show you in real time the translations occurring on your router.

Which command will clear all the translations active on your router? A. show ip nat translations B. show ip nat statistics C. debug ip nat D. clear ip nat translations *

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