Which feature is used to combine multiple physical links into a single logical link for bandwidth and redundancy?

• A. Spanning Tree Protocol
• B. LACP (Link Aggregation Control Protocol)
• C. Port-security
• D. VLAN tagging

Answer: (B)

Link aggregation via LACP lets several physical links act as one logical link (a port channel) to boost total bandwidth and provide redundancy. LACP negotiates with the other end to form the group, so traffic can be spread across all member links. If one link in the group fails, the remaining links continue carrying traffic, preserving connectivity without a single point of failure. This is different from methods that manage topology, security, or traffic segmentation: Spanning Tree Protocol focuses on preventing loops by blocking redundant paths rather than increasing aggregate bandwidth; Port-security limits which devices can connect to a port; VLAN tagging separates traffic into different virtual networks.