CCNA4 Chapter 5 Exam (v5.03) 2016

Last Updated on January 28, 2021 by Admin

CCNA4 Chapter 5 Exam Answer (v5.03) 2016

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

   • DHCP server
   • host device
   • router
   • server
   • switch

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

   • private IP addresses
   • global public IP addresses
   • Internet-routable addresses
   • both private and public IP addresses

 

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

   • PAT
   • static NAT
   • dynamic NAT
   • port forwarding

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

   • dynamic
   • static
   • port address translation
   • overloading

5. What is a disadvantage of NAT?

   • There is no end-to-end addressing.
   • The router does not need to alter the checksum of the IPv4 packets.
   • 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.

6. How does NAT complicate the use of IPsec?

   • End-to-end IPv4 traceability is lost.
   • Troubleshooting is made impossible.
   • Network performance is degraded even more than with just NAT.
   • Header values are modified which causes issues with integrity checks.

 

7. Refer to the exhibit. R1 is configured for NAT as displayed. What is wrong with the configuration?

   

   CCNA4 Chapter 4 Exam v5.03 001

   • Access-list 1 is misconfigured.
   • NAT-POOL2 is not bound to ACL 1.
   • Interface Fa0/0 should be identified as an outside NAT interface.
   • The NAT pool is incorrect.

8. Which statement accurately describes dynamic NAT?

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

9. 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 NAT pool named corp that defines the starting and ending public IP addresses
   • an access list named corp that defines the private addresses that are affected by NAT
   • an access list numbered 4 that defines the starting and ending public IP addresses
   • ip nat outside to be enabled on the interface that connects to the LAN affected by the NAT
   • a VLAN named corp to be enabled and active and routed by R1

10. 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?

    • No users can access the server.
    • The request to the server for the seventh user fails.
    • All users can access the server.
    • The first user gets disconnected when the seventh user makes the request.

 

11. 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?

    

    CCNA4 Chapter 4 Exam v5.03 001

    • defines which addresses can be translated
    • defines which addresses are allowed into the router
    • defines which addresses are assigned to a NAT pool
    • defines which addresses are allowed out of the router

12. What is the purpose of port forwarding?

    • Port forwarding allows an external user to reach a service on a private IPv4 address that is located inside a LAN.
    • Port forwarding allows users to reach servers on the Internet that are not using standard port numbers.
    • Port forwarding allows an internal user to reach a service on a public IPv4 address that is located outside a LAN.
    • Port forwarding allows for translating inside local IP addresses to outside local addresses.

13. What is a characteristic of unique local addresses?

    • They allow sites to be combined without creating any address conflicts.
    • They are designed to improve the security of IPv6 networks.
    • Their implementation depends on ISPs providing the service.
    • They are defined in RFC 3927.

14. Which prefix is used for IPv6 ULAs?

    • 2001:7F8::/29
    • 2001:DB8:1:2::/64
    • FC00::/7
    • FF02::1:FF00:0/104

 

15. Which technology would be used on a router that is running both IPv4 and IPv6?

    • dual stack
    • NAT for IPv6
    • static NAT
    • dynamic NAT

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

    

    CCNA4 Chapter 4 Exam v5.03 003

    • dynamic NAT with a pool of two public IP addresses
    • PAT using an external interface
    • static NAT with one entry
    • static NAT with a NAT pool

17. Refer to the exhibit. The NAT configuration applied to the router is as follows:

    ERtr(config)# access-list 1 permit 10.0.0.0 0.255.255.255

    ERtr(config)# ip nat pool corp 209.165.201.6 209.165.201.30 netmask 255.255.255.224

    ERtr(config)# ip nat inside source list 1 pool corp overload

    ERtr(config)# ip nat inside source static 10.10.10.55 209.165.201.4

    ERtr(config)# interface gigabitethernet 0/0

    ERtr(config-if)# ip nat inside

    ERtr(config-if)# interface serial 0/0/0

    ERtr(config-if)# ip nat outside

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

    

    CCNA4 Chapter 4 Exam v5.03 004

    • NAT is working.
    • Static NAT is working, but dynamic NAT is not.
    • Dynamic NAT is working, but static NAT is not.
    • Not enough information is given to determine if both static and dynamic NAT are working.

 

18. 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?

    • access-list 1 permit 10.0.0.0 0.255.255.255
      ip nat inside source list 1 interface serial 0/0/0 overload
    • access-list 1 permit 10.0.0.0 0.255.255.255
      ip nat pool comp 192.168.2.1 192.168.2.8 netmask 255.255.255.240
      ip nat inside source list 1 pool comp
    • access-list 1 permit 10.0.0.0 0.255.255.255
      ip nat pool comp 192.168.2.1 192.168.2.8 netmask 255.255.255.240
      ip nat inside source list 1 pool comp overload
    • access-list 1 permit 10.0.0.0 0.255.255.255
      ip nat pool comp 192.168.2.1 192.168.2.8 netmask 255.255.255.240
      ip nat inside source list 1 pool comp overload
      ip nat inside source static 10.0.0.5 209.165.200.225

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

    • Define a pool of global addresses to be used for overload translation.
    • Create a standard access list to define applications that should be translated.
    • Define the range of source ports to be used.
    • Identify the inside interface.
    • Define the hello and interval timers to match the adjacent neighbor router.

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

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

21. Fill in the blank. Do not use abbreviations.

    NAT overload is also known as  Port Address Translation

22. 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 an external server at the IP address 209.165.200.254 across a router R1 that is running dynamic NAT. (Not all options are used.)

    • Question
      

      CCNA4 Chapter 4 Exam v5.03 Q001

    • Answer
      

      CCNA4 Chapter 4 Exam v5.03 A001

23. Open the PT Activity. Perform the tasks in the activity instructions and then answer the question.

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

    • The static route should not reference the interface, but the outside address instead.
    • This router should be configured to use static NAT instead of PAT.
    • The ip nat inside source command refers to the wrong interface.
    • The access list used in the NAT process is referencing the wrong subnet.
    • The NAT interfaces are not correctly assigned.