Quiz

Question 1

Which of the following commands will configure a static source NAT mapping of 192.178.10.10 to 203.0.113.10?

1. R1(config)# ip nat inside source static 203.0.113.10 192.168.10.10

2. R1(config)# ip nat inside static source 192.168.10.10 203.0.113.10

3. R1(config)# ip nat source inside static 203.0.113.10 192.168.10.10

4. R1(config)# ip nat inside source static 192.168.10.10 203.0.113.10

Solution

1. R1(config)# ip nat inside source static 192.168.10.10 203.0.113.10

Question 2

You have configured the following command on R1:

• R1(config)# ip nat inside source static 10.0.0.1 20.0.0.1

What will happen when you issue the following command on R1?

• R1(config)# ip nat inside source static 10.0.0.2 20.0.0.1

1. 10.0.0.1 and 10.0.0.2 will both be translated to 20.0.0.1

2. Only 10.0.0.1 will be translated to 20.0.0.1

3. Only 10.0.0.2 will be translated to 20.0.0.1

4. 20.0.0.1 will be translated to 10.0.0.1 or 10.0.0.2

Solution

1. Only 10.0.0.1 will be translated to 20.0.0.1

Question 3

Examine the following partial 'show' command output on R1.

How many active translations will there be if you issue the clear ip nat translation * command on R1?

1. 0

2. 3

3. 4

4. 7

Solution

1. 3

Question 4

Which of the following are private IPv4 addresses? (select all that apply)

1. 10.254.255.0

2. 192.169.0.1

3. 172.32.1.22

4. 192.191.20.2

5. 172.20.2.3

6. 10.11.12.13

Solution

1. 10.254.255.0

1. 172.20.2.3

1. 10.11.12.13

Question 5

Examine the packet flow below as PC1 ping 8.8.8.8 and receives a reply.

Identity each of the following addresses in this situation, from R1's perspective

• Outside Global

• Outside Local

• Inside Local

• Inside Global

Solution

• Outside Global: 8.8.8.8

• Outside Local: 8.8.8.8

• Inside Local: 172.20.0.101

• Inside Global: 200.0.0.1

Question 6

Which of the following NAT types best flfills the goal of preserving public IPv4 addresses?

1. Static NAT

2. Source NAT

3. Dynamic NAT

4. NAT Overload

Solution

1. NAT Overload

Question 7

Which of the following dynamic NAT configurations will translate inside local addresses from 172.16.1.0/24 to addresses from the subnet 203.0.113.0/25?

a

b

c

Solution

b

Question 8

Dynamic NAT is configured on R1 and a pool of 10 inside global addresses is specified. Currently, all 10 addresses are being used by inside hosts, but another inside host attempts to send a packet over the Internet. What does R1 do with this packet?

1. It uses PAT to translate the source IP address of the packet

2. It discards the packet.

3. It holds the packet until an inside global address becomes available.

4. It translates the source IP to the statically mapped inside global address.

Solution

1. It discards the packet.

Question 9

Which of the following dynamic NAT configurations will translate inside local addresses from 10.0.1.0/27 to use the IP address of the router's G0/1 interface?

a

b

c

d

Solution

a

Question 10

After specifying the inside and outside NAT interfaces, you issue the following commands on R1. What will happen to hosts from 192.168.1.0/24 subnet?

1. The source IP of their packets will be translated to an address from 203.0.113.0/24.

2. The packet they send will be discarded by R1.

3. The packet they send will not be translated by R1.

4. The packets they send will be discarded until an inside global address is available.

Solution

1. The packet they send will not be translated by R1.