SV: Chapter 6: NAT/PAT

Q1. Which two statements accurately describe an advantage or a disadvantage when deploying NAT for IPv4 in a network? (Choose two.)

• NAT provides a solution to slow down the IPv4 address depletion.
• NAT introduces problems for some applications that require end-to-end connectivity.
• NAT improves packet handling.
• NAT causes routing tables to include more information.
• NAT will impact negatively on switch performance.

Q2. A network administrator wants to examine the active NAT translations on a border router. Which command would perform the task?

• Router# show ip nat statistics
• Router# clear ip nat translations
• Router# show ip nat translations
• Router# debug ip nat translations

Q3. What are two tasks to perform when configuring static NAT? (Choose two.)

• Define the inside global address on the server
• Define the outside global address.
• Create a mapping between the inside local and inside global addresses.
• Configure a NAT pool.
• Identify the participating interfaces as inside or outside interfaces.

Q4. What is a disadvantage of NAT?

• There is no end-to-end addressing.
• The internal hosts have to use a single public IPv4 address for external communication.
• The costs of readdressing hosts can be significant for a publicly addressed network.
• The router does not need to alter the checksum of the IPv4 packets.

Q5. What is one advantage of using NAT at the edge of the network?

• Changing ISPs is simpler because the devices on the inside network do not have to be configured with new addresses when the outside address changes.
• NAT enables end-to-end IPv4 traceability, making troubleshooting easier.
• Dynamic NAT allows devices from outside the local network to easily initiate TCP connections to inside hosts.
• Performance is significantly increased because the router does not have to perform as many route lookups.

Q6. What address translation is performed by static NAT?

• An inside local address is translated to a specified inside global address.
• An inside local address is translated to a specified outside local address.
• An inside local address is translated to a specified outside global address.
• An outside local address is translated to a specified outside global address.

Q7. Using NAT terminology, what is the address of the source host on a private network as seen from inside the network?

• outside global
• outside local
• inside global
• inside local

Q8. Which statement accurately describes dynamic NAT?

• It dynamically provides IP addressing to internal hosts.
• It always maps a private IP address to a public IP address.
• It provides a mapping of internal host names to IP addresses.
• It provides an automated mapping of inside local to inside global IP addresses.

Q9. A company designs its network so that the PCs in the internal network are assigned IP addresses from DHCP servers, and the packets that are sent to the Internet are translated through a NAT-enabled router. What type of NAT enables the router to populate the translation table from a pool of unique public addresses, as the PCs send packets through the router to the Internet?

• ARP
• PAT
• static NAT
• dynamic NAT

Q10. What is a security feature of using NAT on a network?

• allows external IP addresses to be concealed from internal users
• denies all packets that originate from private IP addresses
• denies all internal hosts from communicating outside their own network
• allows internal IP addresses to be concealed from external users