Cisco Certified Network Associate (CCNA) Practice Exam

When configuring a point-to-multipoint Frame Relay WAN, which command is used to define the local DLCI for the remote IP address?

1. (config-if)#frame-relay interface-dlci DLCI NUMBER

2. (config-if)#frame-relay map ip REMOTE IP ADDRESS LOCAL DLCI

3. (config-if)#ip address IP ADDRESS AND SUBNETMASK

4. (config-if)#no shut

The correct answer is: (config-if)#frame-relay map ip REMOTE IP ADDRESS LOCAL DLCI

In a point-to-multipoint Frame Relay configuration, defining the mapping between a remote IP address and a specific local Data Link Connection Identifier (DLCI) is essential for properly routing packets across the network. The command used for this purpose is designed to create a mapping entry that associates a particular IP address with its corresponding DLCI. The correct command achieves this by explicitly stating the remote IP address and the local DLCI that should be used to reach that address. This mapping allows the router to direct traffic toward the desired destination by looking up the local DLCI associated with the incoming packet's destination IP address. While other commands serve important functions in the configuration of Frame Relay, they do not specifically address the need to create a mapping between an IP address and its DLCI. For example, one command sets the IP address and subnet mask of the interface, while another is used to enable the interface. However, they do not establish the necessary association between IP addresses and DLCIs that the mapping command does, which is crucial in a Frame Relay environment where multiple virtual circuits are often present.