CCIE Data Center (legacy) — Question 43

Which two statements about UCS switch mode are true? (Choose two.)

Answer options

• A. Disjoint Layer 2 networks are supported only when the Ethernet switching mode of the fabric interconnects is configured for switch mode.
• B. Server-to-server multicast and broadcast traffic is sent through all uplink ports in the same VLAN.
• C. Broadcast packets flood out of all ports except the port that it was received on.
• D. Switch mode is the default Ethernet switching mode.
• E. Ethernet switching mode must be used only if the fabric interconnect is connected directly to a router. BC

Correct answer:

Explanation

Option A is correct because disjoint Layer 2 networks are only supported in switch mode. Option D is also correct as switch mode is indeed the default. The other options are incorrect because B misrepresents how traffic is sent, C inaccurately describes broadcast behavior, and E is misleading about the connection requirements for Ethernet switching mode.