CCNA Ch 11: NAT Flashcards

1
Q

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

A

PAT (Port Address Translation)

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2
Q

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

A

inside global addresses

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3
Q

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

A

The NAT interfaces are not correctly assigned.

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4
Q

What is a disadvantage of NAT?

A

here is no end-to-end addressing.

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5
Q

Which statement accurately describes dynamic NAT?

A

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

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6
Q

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?

A

The request to the server for the seventh user fails.

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7
Q

What is the purpose of port forwarding?

A

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

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8
Q

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

A

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

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9
Q

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

A

private IP addresses

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10
Q

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

A

defines which addresses can be translated

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11
Q

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?

A

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

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12
Q

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

A

NAT-POOL2 is not bound to ACL 1

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13
Q

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?

A

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

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14
Q

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?

A

It will bind NAT-POOL1 with ACL 1.

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15
Q

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?

A

access-list 1 permit 10.0.0.0 0.255.255.255

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

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16
Q

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

A

static

17
Q

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

A

router

18
Q

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

A

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

19
Q

What is a characteristic of unique local addresses?

A

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

20
Q

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

A

PAT using an external interface

21
Q

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?

A
  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.
22
Q

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

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