What does MTU stand for, and what happens when frames exceed it due to mismatch?

What does MTU stand for, and what happens when frames exceed it due to mismatch?

• A. Maximum Transmission Unit; mismatches cause drops or black holes for large frames.
• B. Most Transmission Unit; mismatches improve throughput.
• C. Mean Transmission Utility; mismatches have no effect.
• D. Message Transmission Unit; mismatches reroute frames.

Answer: (A)

MTU stands for Maximum Transmission Unit. It defines the largest frame size that can traverse a single link without being fragmented. When a frame is larger than the MTU on a link and fragmentation isn’t supported or allowed, the frame can’t be forwarded and is dropped. If adjacent devices have mismatched MTU values, oversized frames are likely to be discarded at the point they exceed the local MTU, effectively creating a data “black hole” where the information disappears and throughput drops. The other phrasings aren’t standard terminology and don’t describe this behavior.

MTU stands for Maximum Transmission Unit. It defines the largest frame size that can traverse a single link without being fragmented. When a frame is larger than the MTU on a link and fragmentation isn’t supported or allowed, the frame can’t be forwarded and is dropped. If adjacent devices have mismatched MTU values, oversized frames are likely to be discarded at the point they exceed the local MTU, effectively creating a data “black hole” where the information disappears and throughput drops. The other phrasings aren’t standard terminology and don’t describe this behavior.