Which statement correctly describes the role of Link Aggregation Control Protocol (LACP) in SD-WAN networking?

• A. It aggregates multiple physical links into a single logical link for higher bandwidth and redundancy.
• B. It assigns IP addresses to hosts automatically.
• C. It filters traffic based on application layer data.
• D. It provides encryption for data in transit.

Answer: (A)

LACP is used to bond multiple physical links into one logical link, boosting available bandwidth and adding redundancy. In SD-WAN, this lets several WAN paths—like multiple broadband lines or a mix of transports—behave as a single, higher-capacity path between edge devices. LACP negotiates and maintains this aggregation between endpoints, and traffic is distributed across the member links so a failure on one link doesn’t drop connectivity—the others can keep carrying traffic. It doesn’t deal with IP address assignment, application-layer filtering, or encryption; those functions come from DHCP, firewalls/QoS, and encryption protocols like IPsec/TLS, respectively.