Cisco ENCOR Practice Exam 2025 – All-in-One Comprehensive Guide to Mastering Enterprise Network Core Technologies!

Unidirectional Link Detection (UDLD) serves a crucial role in maintaining the integrity of network communications. Its primary function is to monitor the status of links between devices to ensure that they are functioning as expected. When UDLD detects that traffic is only flowing in one direction on a link, it indicates a potential failure in the link or misconfiguration that can lead to network issues such as loops or loss of connectivity.

By shutting down the port when unidirectional traffic is detected, UDLD effectively prevents these problems from occurring, enhancing network stability and reliability. This proactive approach ensures that traffic can only traverse links that are confirmed to be operating bidirectionally, mitigating the risks associated with misconfigured or failing connections.

The other options describe functionalities that are not related to UDLD’s specific purpose. For example, allowing traffic to flow in multiple directions does not align with the unidirectional focus of UDLD. Similarly, VLAN management and establishing backup connections are tasks handled by other network protocols and mechanisms, rather than UDLD itself.