What is the primary service responsibility provided by the Transport Layer in the OSI reference model?
The Transport Layer provides logical communication between application processes running on different hosts (process-to-process delivery), whereas the Network Layer provides host-to-host delivery.
Which addressing identifier is used by the Transport Layer to deliver data to the correct application process on a destination host?
Port numbers are 16-bit integers used at the Transport Layer to uniquely identify specific application processes running on a host.
What is the range of well-known port numbers assigned by IANA for standard system and application services?
IANA assigns port numbers into three ranges: Well-Known Ports (0 to 1023), Registered Ports (1024 to 49151), and Dynamic/Private/Ephemeral Ports (49152 to 65535).
Which of the following describes the key differences between TCP and UDP?
All three statements are fundamental architectural differences between Transmission Control Protocol (TCP) and User Datagram Protocol (UDP).
What is the fixed size of a standard User Datagram Protocol (UDP) header?
A standard UDP header is exactly 8 bytes (64 bits), so none of the listed numeric sizes is correct.