CCNA 2 Chapter 9 Exam Answers

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Exam Chapter 9 Questions and Answers CCNA 2 V6.0

What is the major benefit of using NAT with Port Address Translation?

Port Address Translation (PAT) tracks IP flows of internal hosts using port numbers. By using port numbers to track flows, PAT allows many users to share a single public IPv4 address.

Refer to the exhibit. A technician is configuring R2 for static NAT to allow the client to access the web server. What is a possible reason that the client PC cannot access the web server?

Interface S0/0/0 should be identified as the outside NAT interface. The command to do this would be R2(config-if)# ip nat outside.

Match the steps with the actions that are involved when an internal host with IP address 192.168.10.10 attempts to send a packet to and external server at the IP address 209.165.200.254 across a router R1 that running dynamic NAT. (Not all options are used.)

What is the primary purpose of NAT?

NAT was developed to conserve IPv4 addresses. A side benefit is that NAT adds a small level of security by hiding the internal network addressing scheme. However, there are some drawbacks of using NAT. It does not allow true peer-to-peer communication and it adds latency to outbound connections.

Refer to the exhibit. Which address or addresses represent the inside global address?

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?

The overload option enables PAT for a pool of public IP addresses. The source list 4 part of the command refers to the access list that defines what private addresses get translated. The pool corp part of the command refers to the named NAT pool that is created using the separate ip nat pool corp command.

Refer to the exhibit. What is the purpose of the command marked with an arrow shown in the partial configuration output of a Cisco broadband router?

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?

If all the addresses in the NAT pool have been used, a device must wait for an available address before it can access the outside network.

Which statement describes IPv6 ULAs?

IPv6 ULAs are unique local addresses. ULAs are similar to IPv4 private IP addresses and are not routable on the Internet. ULAs do not conserve IPv6 addresses. ULAs have a network prefix in the fc00::/7 range.

What is a disadvantage of NAT?

Many Internet protocols and applications depend on end-to-end addressing from the source to the destination. Because parts of the header of the IP packets are modified, the router needs to alter the checksum of the IPv4 packets. Using a single public IP address allows for the conservation of legally registered IP addressing schemes. If an addressing scheme needs to be modified, it is cheaper to use private IP addresses.

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

The output shows that there are two inside global addresses that are the same but that have different port numbers. The only time port numbers are displayed is when PAT is being used. The same output would be indicative of PAT that uses an address pool. PAT with an address pool is appropriate when more than 4,000 simultaneous translations are needed by the company.

Which method is used by a PAT-enabled router to send incoming packets to the correct inside hosts?

A PAT-enabled router maintains a table that consists of a mapping of inside local IP addresses and TCP/UDP port numbers to outside local addresses and TCP/UDP port numbers. When traffic returns to the router from the public network, the router would compare the destination port to the PAT mapping table to determine to which inside host the traffic should be sent.

A network administrator is configuring a static NAT on the border router for a web server located in the DMZ network. The web server is configured to listen on TCP port 8080. The web server is paired with the internal IP address of 192.168.5.25 and the external IP address of 209.165.200.230. For easy access by hosts on the Internet, external users do not need to specify the port when visiting the web server. Which command will configure the static NAT?

The IOS command for port forwarding configuration in global configuration mode is as follows:

ip nat inside source {static {tcp | udp local-ip local-port global-ip global-port}
Where local-ip is the inside local address, local-port is the port on which the web server listens.

What is defined by the ip nat pool command when configuring dynamic NAT?

Dynamic NAT uses a pool of inside global addresses that are assigned to outgoing sessions. Creating the pool of inside global addresses is accomplished using the ip nat pool command.

What is a characteristic of unique local addresses?

Link-local addresses are defined in RFC 3927. Unique local addresses are independent of any ISP, and are not meant to improve the security of IPv6 networks.

Fill in the blank. Do not use abbreviations.
NAT overload is also known as

What is the purpose of port forwarding?

Port forwarding allows a user or program from outside to reach services inside a private network. It is not a technique that allows for using services with nonstandard port numbers. NAT or PAT convert inside IP addresses to outside local addresses.

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?

In order for the ip nat inside source list 4 pool corp command to work, the following procedure needs to be used beforehand:
Create an access list that defines the private IP addresses affected by NAT.
Establish a NAT pool of starting and ending public IP addresses by using the ip nat pool command.
Use the ip nat inside source list command to associate the access list with the NAT pool.
Apply NAT to internal and external interfaces by using the ip nat inside and ip nat outside commands.

What are two of the required steps to configure PAT? (Choose two.)

The steps that are required to configure PAT are to define a pool of global addresses to be used for overload translation, to configure source translation by using the keywords interface and overload, and to identify the interfaces that are involved in the PAT.

What is an advantage of deploying IPv4 NAT technology for internal hosts in an organization?

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What are two benefits of NAT? (Choose two.)


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