IPv6, NAT, and PAT Configuration
This document covers several key concepts related to IPv6, Network Address Translation (NAT), and Port Address Translation (PAT).
1. IPv6 EUI-64 Identifier
Refer to the exhibit. The IPv6 address 2006:1::1/64 with EUI-64 has been configured on the router’s FastEthernet0/0 interface. Which statement accurately describes the EUI-64 identifier configuration?
The configuration will derive the interface portion of the IPv6 address from the MAC address of the interface.
2. Inside Global Address
Refer to the exhibit. Which address or addresses represent the inside global address?
209.165.20.25
3. IPv6 Subnetting
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
4. Benefits of NAT
What are two benefits of NAT? (Choose two.)
- It saves public IP addresses.
- It adds a degree of privacy and security to a network.
5. NAT vs. PAT
What is true regarding the differences between NAT and PAT?
PAT uses unique source port numbers to distinguish between translations.
6. Connecting IPv6 Islands
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?
Use tunneling to encapsulate the IPv6 traffic in the IPv4 protocol.
7. NAT Pool Addresses
Refer to the exhibit. Which two addresses could be assigned to traffic leaving S0 as a result of the statement ip nat pool Tampa 179.9.8.96 179.9.8.111 netmask 255.255.255.240? (Choose two.)
- 179.9.8.98
- 179.9.8.101
8. FTP Server Configuration
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.)
- Open port 20
- Open port 21
- NAT with port forwarding
9. Activating RIPng
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.
10. IPv6 Broadcast Domains
Refer to the exhibit. How many IPv6 broadcast domains exist in this topology?
0
11. NAT Translation Failure
Refer to the exhibit. Traffic exiting R1 is failing translation. What part of the configuration is most likely incorrect?
Access-list statement
12. DHCP Assigned Addresses
Refer to the exhibit. According to the output, how many addresses have been successfully assigned by this DHCP server?
8
13. Purpose of a Router 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?
Defines which addresses can be translated
14. Clearing Dynamic Translations
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?
Because entries can be cached for long periods of time, the supervisor wants to prevent decisions being made based on old data.
15. NAT Configuration Analysis
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.
- Permitted traffic gets translated to a single inside global IP address.
16. Destination IP Address
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 a valid destination IP address for HostA to put in its IP header when communicating with the web server?
172.30.20.2
17. NAT for Web Server
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?
Static NAT
18. IPv6 Interface ID Bits
How many bits of an IPv6 address are used to identify the interface ID?
64
19. SDM NAT Configuration
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 outside network sees a request addressed from 192.168.1.3 using port 80.
20. DHCP Client Issues
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 pool does not have a default router defined for the clients.
21. Excluded Addresses Assignment
Refer to the exhibit. On the basis of the configuration shown, how should the pool of 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.