CCNA 4 Chapter 7 Exam Answers
1. Refer to the exhibit. A technician used SDM to enter the NAT configuration for a Cisco router. Which statement correctly describes the result of the configuration?
A user on the inside sees web traffic coming from 192.168.1.3 using port 8080.
The address 172.16.1.1 is translated into an address from the pool beginning with 192.168.1.3.
A user on the outside network sees a request addressed from 192.168.1.3 using port 80.
A user on the outside must address traffic to port 8080 to reach the address 172.16.1.1.
2. A network administrator wants to connect two IPv6 islands. The easiest way is through a public network that uses only IPv4 equipment. What simple solution solves the problem?
Replace the devices on the public network with devices that support IPv6.
Configure RIPng on the border routers of each IPv6 island.
Configure the routers to take advantage of dual-stack technology.
Use tunneling to encapsulate the IPv6 traffic in the IPv4 protocol.
3. How many bits of an IPv6 address are used to identify the interface ID?
4. Refer to the exhibit. R1 is performing NAT for the 10.1.1.0/24 network, and R2 is performing NAT for the 192.168.1.2/24 network. What would be valid destination IP address for HostA to put in its IP header when communicating with the web server?
5. Refer to the exhibit. Traffic exiting R1 is failing translation. What part of the configuration is most likely incorrect?
ip nat pool statement
ip nat inside is on the wrong interface
interface s0/0/2 should be a private IP address
6. After activating IPv6 routing on a Cisco router and programming IPv6 addresses on multiple interfaces, what is the remaining step to activate RIPng?
Enter the interface programming mode for each IPv6 interface and enable IPng RIP.
Enter the ipv6 router rip name command and then use network statements to activate RIPng on the interfaces.
Enter the router rip command, and then activate RIPng using the version command. RIPng then automatically runs on all IPv6 interfaces.
Enter the interface programming mode for each IPv6 interface and enable the multicast group FF02::9, and then activate RIPng globally using the ipv6 router rip name command.
7. What are two benefits of NAT? (Choose two.)
It saves public IP addresses.
It adds a degree of privacy and security to a network.
It increases routing performance.
It makes troubleshooting routing issues easier.
It makes tunneling with IPsec less complicated.
8. Refer to the exhibit. Which two statements about the configuration are true? (Choose two.)
Traffic from the 10.1.1.0 network will be translated.
Traffic from the 184.108.40.206 network will be translated.
Permitted traffic gets translated to a single inside global IP address.
A pool of inside global IP addresses from the 10.1.1.0 network will be used for translation.
External users from the 220.127.116.11 network can reach private addresses on the 10.1.1.0 and 10.1.2.0 networks.
9. Refer to the exhibit. Which address or addresses represent the inside global address?
any address in the 10.1.1.0 network
10. A technician has been told by a supervisor to always clear any dynamic translations before attempting to troubleshoot a failed NAT connection. Why has the supervisor issued these instructions?
The supervisor wants to clear any confidential information that may be seen by the technician.
Because entries can be cached for long periods of time, the supervisor wants to prevent decisions being made based on old data.
The translation table may be full and is unable to make new translations until space is available.
Clearing the translations causes the starting configuration to be reread and may correct translation problems that have occurred.
11. Refer to the exhibit. According to the output, how many addresses have been successfully assigned or renewed by this DHCP server?
12. Refer to the exhibit. IPv6 address 2006:1::1/64 eui-64 has been configured on the router FastEthernet0/0 interface. Which statement accurately describes the EUI-64 identifier configuration?
It will randomly generate a 64 bit interface ID.
It will assign an address from the pool of IPv6 private addresses to the interface.
It will assign only the registry prefix of the IPv6 Global Unicast address to the interface.
The configuration will derive the interface portion of the IPv6 address from the MAC address of the interface.
13. Refer to the exhibit. How many IPv6 broadcast domains exist in this topology?
14. Refer to the exhibit. A network technician determines DHCP clients are not working properly. The clients are receiving IP configuration information from a DHCP server configured on the router but cannot access the Internet. From the output in the graphic, what is the most likely problem?
The DHCP server service is not enabled.
The inside interface for DCHP is not defined.
The DHCP pool is not bound to the interface.
The pool does not have a default router defined for the clients.
All the host addresses have been excluded from the DHCP pool.
15. Your organization is issued the IPv6 prefix of 2001:0000:130F::/48 by your service provider. With this prefix, how many bits are available for your organization to create subnetworks?
16. What type of NAT should a network administrator use to ensure that a web server on the inside network is always available to the outside network?
17. 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?
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
18. Refer to the exhibit. Which two addresses could be assigned to traffic leaving S0 as a result of the statement ip nat pool Tampa 18.104.22.168 22.214.171.124 netmask 255.255.255.240? (Choose two.)
19. What is true regarding the differences between NAT and PAT?
PAT uses the word "overload" at the end of the access-list statement to share a single registered address.
Static NAT allows an unregistered address to map to multiple registered addresses.
Dynamic NAT allows hosts to receive the same global address each time external access is required.
PAT uses unique source port numbers to distinguish between translations.
20. Refer to the exhibit. The FTP server has an RFC 1918 private address. Users on the Internet need to connect to the FTP server on the Fa0/0 LAN of R1. Which three configurations must be completed on R1? (Choose three.)
NAT with overloading
open port 20
open port 21
open port 23
NAT with port forwarding
21. Refer to the exhibit. On the basis of the configuration shown, how should the pool of the excluded addresses be assigned to key hosts on the network, such as router interfaces, printers, and servers?
The addresses are statically assigned by the network administrator.
The DHCP server dynamically assigns the addresses.
The addresses must be listed under the DHCP pool of addresses before they are available for static assignment.
The addresses must be listed under the DHCP pool of addresses before they are available for dynamic assignment.