A network engineer is designing a network that must incorporate seamless failover when a link failure occurs between the core and distribution layer. What two technologies will allow this? (Choose…

ECMP (Equal-Cost Multi-Path) allows a router or Layer 3 switch to install multiple equal-cost routes to the same destination and load-balance traffic across them, so when one link fails, traffic immediately uses the remaining equal-cost path with no reconvergence delay.

RSTP provides faster STP convergence than traditional STP but still blocks redundant paths, meaning a link failure requires a convergence event before traffic can use the backup path.

MEC (Multichassis EtherChannel) bonds links from a single downstream switch to multiple upstream chassis into a single logical port channel, eliminating the active/standby limitation of traditional EtherChannel and allowing all links to forward traffic simultaneously while providing instant failover if one chassis fails.

GLBP is a first-hop redundancy protocol that provides load balancing for default gateway traffic from end hosts, not a technology for core-to-distribution link failover.

HSRP is a first-hop redundancy protocol that provides a virtual gateway IP to end hosts, operating in active/standby mode and not providing link-level failover between network tiers.