Company XYZ asks for design recommendations for Layer 2 redundancy. The company wants to prioritize fast convergence and resiliency elements in the design. Which two technologies are recommended?…

MC-LAG allows a device to bundle uplinks to two physically separate switches into a single logical LAG, enabling active-active forwarding with sub-second failover and eliminating the need for STP to block any redundant paths.

DHCP snooping is a Layer 2 security feature that validates DHCP messages to block rogue DHCP servers; it has no effect on redundancy or convergence speed.

Root guard enforces STP root bridge placement by blocking ports that receive superior BPDUs, which is a topology stability and security measure rather than a convergence acceleration or resiliency mechanism.

BPDU guard disables access ports upon receipt of any BPDU to protect against unauthorized switch connections, serving a security purpose on edge ports rather than improving convergence or resiliency in the core.

UniDirectional Link Detection continuously monitors links for the condition where one fiber strand stops passing traffic, and immediately error-disables the affected port to prevent silent forwarding blackholes and potential STP topology corruption.