CCNA 2 v6.0 (Routing & Switching Essentials v6) Chapter 9: NAT for IPv4: Check Your Understanding Questions Answers
1. Typically, which network device is used to perform NAT for a corporate environment?
- Switch
- Server
- DHCP server
- Router
- Host device
2. When NAT is employed in a small office, which address type is typically used for hosts on the local LAN?
- Both private and public IP addresses
- Global public IP addresses
- Internet-routable addresses
- Private 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?
- Dynamic NAT
- PAT
- Port forwarding
- Static NAT
4. Which type of NAT maps a single inside local address to a single inside global address?
- Dynamic
- Overloading
- Port address translation
- Static
5. What is a disadvantage of NAT?
- The costs of readdressing hosts can be significant for a publicly addressed network.
- The internal hosts have to use a single public IPv4 address for external communication.
- There is no end-to-end addressing.
- The router does not need to alter the checksum of the IPv4 packets.
6. How can NAT cause IPsec to fail?
- End-to-end IPv4 traceability is lost.
- Header values are modified, which causes issues with integrity checks.
- Network performance is degraded even more than with just NAT.
- Troubleshooting is made impossible.
7. Which statement accurately describes dynamic NAT?
- It always maps a private IP address to a public IP address.
- It dynamically provides IP addressing to internal hosts.
- It provides a mapping of internal host names to IP addresses.
- It provides an automated mapping of inside local to inside global IP addresses.
8. A network administrator configures the border router with the ip nat inside source list 4 pool NAT-POOL global configuration command. What is required to be configured for this particular command to be functional?
- A VLAN named NAT-POOL to be enabled and active and routed by R1
- A NAT pool named NAT-POOL that defines the starting and ending public IP addresses
- An access list named NAT-POOL 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
9. 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?
- All users can access the server.
- No users can access the server.
- The first user is disconnected when the seventh user makes the request.
- The request to the server for the seventh user fails.
10. What is the purpose of port forwarding?
- Port forwarding allows for translating inside local IP addresses to outside local addresses.
- 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 an external user to reach a service on a private IPv4 address that is located inside a LAN.
11. What is a characteristic of unique local addresses?
- Their implementation depends on ISPs providing the service.
- They allow sites to be combined without creating address conflicts.
- They are defined in RFC 3927.
- They are designed to improve the security of IPv6 networks.
12. Which prefix is used for IPv6 ULAs?
- FC00::/7
- FF02::1:FF00:0/104
- 2001:DB8:1:2::/64
- 2001:7F8::/29
13. Which technology would be used on a router that is running both IPv4 and IPv6?
- Dynamic NAT
- Dual stack
- NAT for IPv6
- Static NAT
14. 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 pool NAT-POOL 192.168.2.1 192.168.2.8 netmask 255.255.255.240
ip nat inside source list 1 pool NAT-POOL - access-list 1 permit 10.0.0.0 0.255.255.255
ip nat pool NAT-POOL 192.168.2.1 192.168.2.8 netmask 255.255.255.240
ip nat inside source list 1 pool NAT-POOL overload - 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 NAT-POOL 192.168.2.1 192.168.2.8 netmask 255.255.255.240
ip nat inside source list 1 pool NAT-POOL overload
ip nat inside source static 10.0.0.5 209.165.200.225
15. What are two of the required steps to configure PAT? (Choose two.)
- Create a standard access list to define applications that should be translated.
- Define a pool of global addresses to be used for overload translation.
- Define the hello and interval timers to match the adjacent neighbor router.
- Define the range of source ports to be used.
- Identify the inside interface.
16. What is the group of public IPv4 addresses used on a NAT-enabled router known as?
- Inside global addresses
- Inside local addresses
- Outside global addresses
- Outside local addresses