Which OSI layer handles end-to-end transport with port numbers?
A CISSP practice question covering Domain 4: Communication and Network Security. Try answering before reading the explanation below.
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Why "Layer 4 — Transport" is the right answer
Layer 4 (Transport) hosts TCP and UDP, which use ports for endpoint identification. Layer 2 uses MAC addresses. Layer 3 uses IP addresses. Layer 7 contains applications and their protocols.
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