Cisco Certified Network Associate (CCNA) Practice Exam

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Which standard-based designation is used for Link Aggregation Control Protocol (LACP)?

  1. 802.1Q

  2. 802.3ad

  3. 802.3ae

  4. 802.3z

The correct answer is: 802.3ad

The correct designation for Link Aggregation Control Protocol (LACP) is indeed 802.3ad. This standard is part of the Ethernet specifications and outlines how to bundle multiple physical links into a single logical link, allowing for increased bandwidth and redundancy. LACP helps manage these link aggregates dynamically. Understanding this is essential because LACP allows for load balancing across multiple links while providing failover capabilities—if one link in the aggregation fails, the others can still handle traffic. The standard ensures compatibility and interoperability between devices from different manufacturers, which is crucial in multi-vendor network environments. The other options pertain to different Ethernet standards: 802.1Q relates to VLAN tagging, 802.3ae deals with 10 Gigabit Ethernet standards, and 802.3z concerns Gigabit Ethernet over fiber. These standards serve distinct purposes within networking and do not pertain to link aggregation control as LACP does.

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