Which option describes the standard that combines multiple physical links into a single logical link?

Which option describes the standard that combines multiple physical links into a single logical link?

• A. Quality of Service
• B. PoE
• C. Spanning Tree Protocol
• D. IEEE 802.3ad standard that combines multiple physical links

Answer: (D)

Link aggregation is the practice of combining multiple physical Ethernet links into a single logical link to boost bandwidth and provide redundancy. The standard that defines this approach is IEEE 802.3ad, implemented as Link Aggregation Control Protocol (LACP). It allows switches and interfaces to negotiate and form a single logical channel called a link aggregation group (LAG) or EtherChannel, distributing traffic across the member links and remaining operational if one link fails. Both ends must support the same aggregation protocol and be configured accordingly, with the hashing method determining how traffic is spread across the links. Other options refer to different functions: Quality of Service prioritizes traffic, PoE provides power over Ethernet, and Spanning Tree Protocol prevents loops by blocking redundant paths rather than combining links into one logical path.

Link aggregation is the practice of combining multiple physical Ethernet links into a single logical link to boost bandwidth and provide redundancy. The standard that defines this approach is IEEE 802.3ad, implemented as Link Aggregation Control Protocol (LACP). It allows switches and interfaces to negotiate and form a single logical channel called a link aggregation group (LAG) or EtherChannel, distributing traffic across the member links and remaining operational if one link fails. Both ends must support the same aggregation protocol and be configured accordingly, with the hashing method determining how traffic is spread across the links. Other options refer to different functions: Quality of Service prioritizes traffic, PoE provides power over Ethernet, and Spanning Tree Protocol prevents loops by blocking redundant paths rather than combining links into one logical path.