RSE CCNA 2 Chapter 9 Quiz Online

Hint

The clear ip nat translations command clears all dynamic address translation entries from the NAT translation table. The debug ip nat command is used to verify the operation of NAT. The show ip nat statistics command displays information about the total number of active translations, NAT configuration parameters, the number of addresses in the pool, and the number that have been allocated. The show ip nat translations command displays the active NAT translations.

Hint

ARP is the address resolution protocol and is used to obtain the MAC address of the destination device. Static NAT is a one-to-one mapping between the local and global addresses of a device. PAT, otherwise known as NAT overload, maps multiple private IP addresses to a singular public address or group of addresses. Dynamic NAT uses a pool of public IP addresses and assigns them to requesting devices on a first-come, first-served basis. In the case of dynamic NAT, each device would have a unique public IP address from the pool of public IP addresses as the source IP address in the packets that they send.

Hint

The displayed command establishes static translation between an inside local address and local port and an inside global address and global port. In order to identify the inside NAT interface, the command Router(config-if)# ip nat inside would have to be entered on the respective interface.

Hint

Dynamic NAT provides a dynamic mapping of inside local to inside global IP addresses. NAT is merely the one-to-one mapping of one address to another address without taking into account whether the address is public or private. DHCP is automatic assignment of IP addresses to hosts. DNS is mapping host names to IP addresses.

Hint

Static NAT translations are usually used when clients on the outside network (Internet) need to reach servers on the inside (internal) network. The process begins with the client trying to communicate with the web server by the use of the inside global address of the web server as the destination address. The router receives this on its outside interface, consults its NAT table, locates the destination address, and forwards the packet to the web server on the internal network via its inside local address. The web server response goes to the router, which replaces the web server inside local address with the global address (NAT table) and forwards the packet to the client on its external interface.

Hint

The correct syntax would be R1(config)# ip nat inside source static 192.168.11.11 209.165.200.1. (The inside local address is 192.168.11 and the inside global address is 209.165.200.1.)

Hint

Typically, the translation from private IP addresses to public IP addresses is performed on routers in corporate environments. In a home environment, this device might be an access point that has routing capability or the DSL or cable router.

Hint

The wildcard mask in the access control entry does not allow traffic from both the 192.168.11.0/24 and the 192.168.12.0/24 networks. The correct configuration command is R1(config)# access-list 1 permit 192.168.0.0 0.0.255.255.

Hint

In order for the ip nat inside source list 4 pool corp command to work, the following procedure needs to be used:

• Create an access list that defines the private IP addresses affected by NAT.
• Establish a NAT pool of starting and ending public IP addresses 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.

Hint

There is not enough information given because the router might not be attached to the network yet, the interfaces might not have IP addresses assigned yet, or the command could have been issued in the middle of the night. The output does match the given configuration, so no typographical errors were made when the NAT commands were entered.

Hint

NAT for IPv6 is a temporary measure to aid in the move from IPv4 to IPv6. NAT64 is replacing NAT-PT. Dual stack is a method for running IPv4 and IPv6 on the same network.