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

A port that is enabled but not forwarding any traffic is categorized as a Blocking Port. In network terminology, this state is part of the Spanning Tree Protocol (STP) which is used to prevent loops in a network topology. When a port is in the blocking state, it actively listens to traffic and can learn about the MAC addresses on the network, but it does not forward any data frames.

The blocking state is essential for maintaining a loop-free topology. When a switch detects a potential loop created by redundant connections, it will block certain ports. This ensures that there is a single active path to any destination within the network. The port can transition to the listening or learning state if it is deemed safe, thereby allowing traffic to be forwarded if necessary.

In contrast, ports in learning, forwarding, or disabled states have different functions: a Learning Port is in the process of discovering MAC addresses; a Forwarding Port actively sends and receives traffic; while a Disabled Port is completely inactive and not participating in the network. Thus, the correct term for a port that is enabled yet not forwarding traffic is indeed Blocking Port.