Question 1.
Which of the following can be used to define "rules" for which IP devices get translated by NAT:

a) Access Lists
b) Extended Access Lists
c) Route Maps
d) All of the above

Answer

Question 2.
What is the function of TCP Load Distribution with NAT?

a) Allows the NAT process to load balance a TCP request to multiple real host systems via an IP address of a virtual host with the use of a rotary pool.
b) Allows NAT to load balance a TCP request across multiple outbound interfaces that have equal cost paths to the remote host.
c) Allows NAT to load balance a TCP request across multiple LAN interfaces on the router that have equal cost paths to the host on the inside network.
d) None of the above.

Answer

Question 3.
What are the port ranges that are used by Port Address Translation (PAT) to perform translations?

a) 0-511
b) 512-1023
c) 1024-65535
d) All of the above

Answer

Answers

Question 1.
Which of the following can be used to define "rules" for which IP devices get translated by NAT:

a) Access Lists
b) Extended Access Lists
c) Route Maps
d) All of the above

Answer
d) All of the above

Explanation
Access Lists, Extended Access Lists, and Route Maps can all be used to define "rules" for which IP device(s) gets translated. When NAT uses a route map to decide to create a translation entry, it will always create a "fully extended" translation entry. This translation entry will contain both the inside and outside (local and global) address entries and any TCP or UDP port information. When NAT uses an access list to decide to create a translation entry, it will create a "simple" translation entry. This "simple" entry will contain local and global IP address entries for only the inside or outside, depending on whether the ip nat inside or ip nat outside command is configured. Also, it will not include any TCP or UDP port information.
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Question 2.
What is the function of TCP Load Distribution with NAT?

a) Allows the NAT process to load balance a TCP request to multiple real host systems via an IP address of a virtual host with the use of a rotary pool.
b) Allows NAT to load balance a TCP request across multiple outbound interfaces that have equal cost paths to the remote host.
c) Allows NAT to load balance a TCP request across multiple LAN interfaces on the router that have equal cost paths to the host on the inside network.
d) None of the above.

Answer
a) Allows the NAT process to load balance a TCP request to multiple real host systems via an IP address of a virtual host with the use of a rotary pool.

Explanation
Organizations may have multiple hosts that must communicate with a heavily used host. Using NAT, you can establish a virtual host on the inside network that coordinates load sharing among real hosts. Destination addresses that match an access list are replaced with addresses from a rotary pool. Allocation is done in a round-robin fashion, and only when a new connection is opened from the outside to the inside.
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Question 3.
What are the port ranges that are used by Port Address Translation (PAT) to perform translations?

a) 0-511
b) 512-1023
c) 1024-65535
d) All of the above

Answer
d) All of the above

Explanation
You can conserve addresses in the inside global address pool by allowing the router to use one global address for many local addresses. When this overloading is configured, the router maintains enough information from higher-level protocols (for example, TCP or UDP port numbers) to translate the global address back to the correct local address. When multiple local addresses map to one global address, the TCP or UDP port numbers of each inside host distinguish among the local addresses.

PAT ("Overloading") divides the available ports per global IP Address into 3 ranges "0-511, 512-1023, and 1024-65535". PAT assigns a unique Source Port for each UDP or TCP sessions.
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