Which of the following would be good reasons to run NAT?
You need to connect to the Internet and your hosts don't have globally unique IP addresses.
You change to a new ISP that requires you to renumber your network.
You don't want any hosts connecting to the Internet.
You require two intranets with duplicate addresses to merge.
Options
A. 1, 2 and 4
B. 2 and 4
C. 3 only
D. All of the above
Correct Answer
1, 2 and 4
Explanation
The most popular use of NAT is if you want to connect to the Internet and you don't want hosts to have global (real) IP addresses, but option B and D are correct as well.
Network Address Translation problems
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1. Which of the following is considered to be the address before translation?
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.
5. Which switching technology reduces the size of a broadcast domain?
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.
9. Which command will create a dynamic pool named Todd that will provide you with 30 global addresses?
Options
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
Correct Answer: ip nat pool Todd 171.16.10.65 171.16.10.94 net 255.255.255.224
Explanation:
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.
10. Which command will show you the summary of the NAT configuration?
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 (causing an attempt to create a mapping), and expired translations.