Cisco Certified Network Associate (CCNA) Practice Exam

What is the command sequence to configure a Frame Relay serial link on a Frame Relay network with one subnet per VC?

1. interface SERIAL INTERFACE and encapsulation frame-relay

2. interface SERIAL INTERFACE and no shut

3. interface SERIAL INTERFACE.SUB INTERFACE and ip address IP ADDRESS AND SUBNETMASK

4. All of the above

The correct answer is: All of the above

The correct answer encompasses all the elements needed to establish a Frame Relay serial link on a Frame Relay network, particularly when one subnet per Virtual Circuit (VC) is being utilized. Starting with the interface command, configuring the serial interface is fundamental. The command to enter the serial interface mode allows you to set parameters specific to that interface. Following this, the encapsulation frame-relay command is crucial because it defines the encapsulation type used over the link, which for Frame Relay, is essential for proper communication. Additionally, while not explicitly detailing the interface status, the "no shut" command is typically employed to ensure the interface is up and operational, promoting connectivity. The use of sub-interfaces is particularly important when classifying multiple logical connections over a single physical interface in Frame Relay, thereby allowing differentiation of traffic between various VLANs or subnets. With each sub-interface configured with an IP address and subnet mask, this establishes the routing capabilities of the network effectively. Each of these components plays a significant role in the overall configuration necessary for a successful Frame Relay setup.