CCNA: Cisco Certified Network Associate — Question 641

A network administrator needs to aggregate 4 ports into a single logical link which must negotiate layer 2 connectivity to ports on another switch. What must be configured when using active mode on both sides of the connection?

Answer options

• A. LLDP
• B. LACP
• C. Cisco vPC
• D. 802 1q trunks

Correct answer: B

Explanation

The correct answer is B, LACP, as it is the protocol used to dynamically aggregate multiple physical ports into a single logical link, allowing for load balancing and redundancy. LLDP (A) is a discovery protocol, Cisco vPC (C) is for creating a virtual port channel in Cisco environments but doesn't directly relate to the aggregation of ports, and 802.1q trunks (D) are used for VLAN tagging but do not aggregate ports.