Which of the following does Link Aggregation (LAG) improve in high availability scenarios?

Link Aggregation (LAG), defined by the IEEE 802.3ad standard, improves high availability by providing both redundancy and increased bandwidth. It bundles multiple physical network links into a single logical link. If any single physical link within the LAG fails, traffic is automatically and transparently redistributed among the remaining active links, ensuring uninterrupted connectivity. This provides link-level redundancy. Additionally, the bandwidth of the logical link is the aggregate of the bandwidths of all member physical links, thus improving bandwidth utilization.

A. LAG operates at Layer 2 and has no direct effect on the size of Layer 3 routing tables.

C. LAG is a Layer 2 technology and does not influence the number of Layer 3 IP addresses required for a device.

D. LAG does not primarily reduce router CPU load; its main goals are increased bandwidth and link redundancy.

1. Juniper Networks TechLibrary. (2023). Junos OS Services for Switches. "Understanding Link Aggregation and Link Aggregation Control Protocol

" Section: Link Aggregation. "Link aggregation... enables you to group Ethernet interfaces to form a single link layer interface... The LAG balances traffic across the member links within an aggregated Ethernet bundle and effectively increases the uplink bandwidth. Another advantage of link aggregation is increased availability

because the LAG is composed of multiple member links."

2. Juniper Networks TechLibrary. (2023). Junos OS High Availability User Guide. "Link Redundancy

" Section: Link Aggregation. "Link aggregation... provides redundancy by load-balancing traffic across multiple links."