CCNA Ch 11: NAT

Question 1

Which version of NAT allows many hosts inside a private network to simultaneously use a single inside global address for connecting to the Internet?

Answer 1

PAT (Port Address Translation)

Question 2

What is the group of public IPv4 addresses used on a NAT-enabled router known

Answer 2

inside global addresses

Question 3

PT: What problem is causing PC-A to be unable to communicate with the Internet?

Answer 3

The NAT interfaces are not correctly assigned.

Question 4

What is a disadvantage of NAT?

Answer 4

here is no end-to-end addressing.

Question 5

Which statement accurately describes dynamic NAT?

Answer 5

It provides an automated mapping of inside local to inside global IP addresses.*

Question 6

When dynamic NAT without overloading is being used, what happens if seven users attempt to access a public server on the Internet when only six addresses are available in the NAT pool?

Answer 6

The request to the server for the seventh user fails.

Question 7

What is the purpose of port forwarding?

Answer 7

Port forwarding allows an external user to reach a service on a private IPv4 address that is located inside a LAN.

Question 8

PICTURE: What has to be done in order to complete the static NAT configuration on R1?

Answer 8

Interface S0/0/0 should be configured with the command ip nat outside.

Question 9

When NAT is employed in a small office, which address type is typically used for hosts on the local LAN?

Answer 9

private IP addresses

Question 10

PICTURE: What is the purpose of the command marked with an arrow shown in the partial configuration output of a Cisco broadband router?

Answer 10

defines which addresses can be translated

Question 11

A network administrator configures the border router with the command R1(config)# ip nat inside source list 4 pool corp. What is required to be configured in order for this particular command to be functional?

Answer 11

a NAT pool named corp that defines the starting and ending public IP addresses

Question 12

PICTURE: R1 is configured for NAT as displayed. What is wrong with the configuration?

Answer 12

NAT-POOL2 is not bound to ACL 1

Question 13

A network engineer has configured a router with the command ip nat inside source list 4 pool corp overload. Why did the engineer use the overload option?

Answer 13

The company has more private IP addresses than available public IP addresses.

Question 14

R2:config)# ip nat inside source list 1 pool NAT-POOL1

hat will be the effect of entering the command that is shown in the exhibit on R2 as part of the dynamic NAT configuration?

Answer 14

It will bind NAT-POOL1 with ACL 1.

Question 15

Which configuration would be appropriate for a small business that has the public IP address of 209.165.200.225/30 assigned to the external interface on the router that connects to the Internet?

Answer 15

access-list 1 permit 10.0.0.0 0.255.255.255

ip nat inside source list 1 interface serial 0/0/0 overload

Question 16

Which type of NAT maps a single inside local address to a single inside global address?

Answer 16

static

Question 17

Typically, which network device would be used to perform NAT for a corporate environment

Answer 17

router

Question 18

Several key servers in an organization must be directly accessible from the Internet. What addressing policy should be implemented for these servers?

Answer 18

Assign static internal addresses and public external addresses to each of the servers.

Question 19

What is a characteristic of unique local addresses?

Answer 19

hey allow sites to be combined without creating any address conflicts.

Question 20

PICTURE: Based on the output that is shown, what type of NAT has been implemented?

Answer 20

PAT using an external interface

Question 21

What are five [5] order when an internal host with an address 192.168.10.10 to and external IP address 209.165.200.254 across a dynamic NAT on a router?

Answer 21

1. host send packet requesting to connect to IP 209.165.200.254
2. R1 checks the NAT config to determ id this packet should be translated
3. If there is no translation entry for this IP address. R1 determines that the source address 192.168.10.10 be translated
4. R1 selects an available global address from dynamic address pool
5. R1 Replaces the address 192.168.10.10 with translated inside global address.

Question 22

What are two [2] required steps to configure PAT?

Answer 22

1. Define a pool of global addresses to be used for overload translation.
2. Identify the inside interface.