Exercise: Network Address Translation

Questions for: Network Address Translation

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 *
Answer: D
The command clear ip nat translations * will clear all the active NAT entries in your translation table.
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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
Answer: B
The command ip nat pool <name> creates the 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 the pool name has a lower case "T" in the pool name. Pool name's are case sensitive.
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Which of the following is considered to be the destination host after translation?
A:
Inside local
B:
Outside local
C:
Inside global
D:
Outside global
Answer: D
The host on the global network after translation is considered to be an outside global host.
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Which of the following are disadvantages 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.
A:
1, 3 and 5
B:
3 and 4
C:
2, 4 and 5
D:
1 and 3
Answer: A
NAT is not perfect and can cause some issues in some networks, but most networks work just fine. NAT can cause delays and troubleshooting problems, and some applications just won't work.
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Which of the following is considered to be the address before translation?
A:
Inside local
B:
Outside local
C:
Inside global
D:
Outside global
Answer: A
The host on the private network before translation is considered to be an inside local host.
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