Layer 4 — CompTIA Network+ (N10-009) Practice Questions
Layer 4 of the OSI model is the Transport layer, responsible for end-to-end communication, segmentation, and reliable or unreliable delivery of data between hosts. The N10-009 exam tests knowledge of the two primary Transport layer protocols: TCP, which provides connection-oriented, reliable delivery with acknowledgments and flow control, and UDP, which offers connectionless, low-overhead transmission suited to real-time applications. Candidates must understand port numbers, socket pairs, and how Transport layer functions distinguish application traffic. Understanding Layer 4 is foundational for troubleshooting connectivity issues and analyzing network captures.
Free questions on layer 4
Which Layer 4 protocol is used by DNS for zone transfers and should be protected on internal networks?
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- Which protocol operates at Layer 4 and is connectionless? Unlock answer & explanation →