Cisco Certified Network Associate (CCNA) Practice Exam

How are traffic congestion control bits initially set in a Frame Relay frame header?

1. Set to 1

2. Set to 0

3. Set to 10

4. Set to 255

The correct answer is: Set to 0

In a Frame Relay frame header, traffic congestion control bits are initially set to 0. This indicates that there is no congestion being reported on the network at the time of frame transmission. Setting these bits to 0 is an essential aspect of congestion control mechanisms within Frame Relay, as it allows the network devices to monitor traffic and adjust accordingly when congestion occurs. When the traffic congestion control bits are set to 0, it reflects an ideal state without any network overload, enabling efficient data transmission. If congestion were to develop, these bits can be modified to indicate the need for traffic management, thereby facilitating a proactive approach to maintaining network performance. Understanding the initial state of these bits is crucial for network engineers to effectively manage data flow and ensure quality of service in a Frame Relay environment.