2-11: NAT Flashcards

1
Q

What is a disadvantage of NAT?

A

There is no end-to-end addressing.

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1
Q

If a host with an internal IP of 192.168.10.10 attempts to send a packet to an external server at the IP 209.165.200.254 across a router running dynamic NAT, what is the second step in resolving the address?

A

Router checks the NAT configuration to determines if this packet should be translated.

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1
Q

The Inside Local address is usually what?

A

An RFC 1918 address

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2
Q

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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2
Q

Private IPs are often referred to as

A

Non-routeable or RFC1918 addresses

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4
Q

If a host with an internal IP of 192.168.10.10 attempts to send a packet to an external server at the IP 209.165.200.254 across a router running dynamic NAT, what is the third step in resolving the address?

A

If there is no translation entry for this IP address, the router determines that the internal address must be translated.

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5
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.

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6
Q

If a host with an internal IP of 192.168.10.10 attempts to send a packet to an external server at the IP 209.165.200.254 across a router running dynamic NAT, what is the fourth step in resolving the address?

A

The router selects an available global address from the dynamic address pool.

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6
Q

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

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

A

It will bind NAT-POOL1 with ACL 1.

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8
Q

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

A

static

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9
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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9
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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9
Q

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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10
Q

The Outside Global address is what?

A

The Reachable IP of a host on the internet.

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12
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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13
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

15
Q

If a host with an internal IP of 192.168.10.10 attempts to send a packet to an external server at the IP 209.165.200.254 across a router running dynamic NAT, what is the first step in resolving the address?

A

The host sends packets that request a connection to the address.

16
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.

17
Q

What is a characteristic of unique local addresses?

A

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

18
Q

Based on the configuration and the output shown, what can be determined about the NAT status within the organization?

A

Not enough information is given to determine if both static and dynamic NAT are working.

19
Q

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

A

Router

20
Q

The Inside Global address is what?

A

The Public IP inside host is given as it exits NAT

22
Q

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

A

Inside global addresses

23
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

25
Q

What are two required steps to configure PAT?

A

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

26
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

27
Q

If a host with an internal IP of 192.168.10.10 attempts to send a packet to an external server at the IP 209.165.200.254 across a router running dynamic NAT, what is the fifth step in resolving the address?

A

The router replaces the internal address with the translated global address.

28
Q

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

A

NAT-POOL2 is not bound to ACL 1.

29
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

30
Q

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

A

PAT using an external interface