350-401 · Question #880
350-401 Question #880: Real Exam Question with Answer & Explanation
The correct answer is D: MRU. MRU (Maximum Receive Unit) is correct because it specifically defines the maximum packet size that a host interface is willing to accept on ingress (incoming traffic). It is a TCP-level parameter that informs the sender of the largest segment the receiver can handle, making it re
Question
Which component of TCP defines the maximum packet size that a host interface is able to accept on ingress?
Options
- AMTU
- BPATH MTU
- CWindow size
- DMRU
Explanation
MRU (Maximum Receive Unit) is correct because it specifically defines the maximum packet size that a host interface is willing to accept on ingress (incoming traffic). It is a TCP-level parameter that informs the sender of the largest segment the receiver can handle, making it receiver-focused by definition.
Why the distractors are wrong:
- MTU (A) defines the maximum packet size a network interface can transmit (egress), not receive - it's an outbound/layer 2 concept.
- Path MTU (B) refers to the smallest MTU across an entire network path between two hosts, used to avoid fragmentation - it's a path-wide discovery mechanism, not a single host's receive limit.
- Window size (C) controls how much unacknowledged data can be in flight at once (flow control), not the size of individual packets.
Memory Tip: Think of MRU = "Maximum Receiving Unit" - the "R" stands for Receive, so it's always about what comes in. Contrast this with MTU where "T" = Transmit (what goes out). If the question mentions ingress or receive, think MRU.
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