B. performs a lookup to learn the destination interface. Explanation: Frame switching involves forwarding Ethernet frames based on the destination MAC address. When a switch receives a frame, it looks up the destination MAC address in its MAC address table (also known as CAM table or forwarding table). The lookup process helps the switch determine the outgoing interface (port) through which the frame should be forwarded. This lookup is essential for efficient and accurate forwarding of frames within a local network segment.

B is correct In frame switching, when a frame is received, the switch examines its destination MAC address and performs a lookup in its MAC address table to determine the appropriate outgoing interface. This allows the switch to forward the frame directly to the destination device without flooding it to all ports, which enhances network efficiency.

is CISCLOWN time!! try and guess which one is the least incorrect out of 4 awful questions!!!! .. B seems to be the least incorrect, i just don't care enough anymore A -> switches don't do that, thats a function of a router or layer3 switch C -> he just

I guess the answer is B but I don’t like how it is worded. The device that performs a lookup to learn the destination interface in frame switching is a Layer 2 switch. Layer 2 switches do not change the MAC addresses of frames; instead, they filter, forward, or flood frames based on the information in the MAC address table[1]. When a frame is received by a Layer 2 switch, it checks the destination MAC address against its MAC address table to determine the appropriate outgoing interface for forwarding the frame. This lookup process allows the switch to efficiently direct frames to their intended destinations within the network without altering the source and destination MAC addresses[3].