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101 · Question #614
101 Question #614: Real Exam Question with Answer & Explanation
The correct answer is A: Link Aggregation Control Protocol (LACP). LACP (IEEE 802.3ad) bundles multiple physical Ethernet links into one logical channel, providing both redundancy and combined bandwidth beyond any single link.
Question
An administrator needs to connect a new device to a switched network. The interconnect must be both redundant and combined bandwidth than a single link Which low-level protocol will help facilitate this?
Options
- ALink Aggregation Control Protocol (LACP)
- BLink Allocation & Configuration Protocol (LACP)
- CLink Local Distribution Protocol (LLDP)
- DLink Layer Discovery Protocol (LDP)
Explanation
LACP (IEEE 802.3ad) bundles multiple physical Ethernet links into one logical channel, providing both redundancy and combined bandwidth beyond any single link.
Common mistakes.
- B. 'Link Allocation and Configuration Protocol' is a fabricated name with no corresponding networking standard or RFC.
- C. LLDP (Link Layer Discovery Protocol) is a vendor-neutral Layer 2 neighbor-discovery protocol used for topology mapping, not for bundling links or increasing bandwidth.
- D. LDP (Label Distribution Protocol) distributes MPLS label-to-FEC bindings in MPLS networks and is entirely unrelated to link aggregation or bandwidth combining.
Concept tested. Link aggregation using LACP IEEE 802.3ad
Reference. https://www.ieee802.org/3/ad/
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