Company XYZ wants design recommendations for Layer 2 redundancy (using Layer 2 technologies). The company wants to prioritize flexibility and scalability elements in the new design. Which two…

DHCP snooping is a Layer 2 security feature that prevents rogue DHCP servers, but it does not contribute to redundancy, flexibility, or scalability in the network design.

Switch clustering at the distribution layer using technologies like VSS or StackWise allows multiple physical switches to appear as a single logical device, providing redundancy and simplified management while improving scalability by removing STP convergence delays between clustered units.

Unidirectional Link Detection detects and disables unidirectional links to prevent STP loops, but it is a protective mechanism rather than a technology that adds flexibility or scalability.

Avoiding stretched VLANs limits broadcast domain size and failure domains, improving scalability and flexibility by keeping Layer 2 segments local and reducing the risk of network-wide broadcast storms or STP topology changes.

Root guard prevents external switches from becoming the STP root bridge, which is a stability protection feature rather than a mechanism for improving flexibility or scalability.