A network engineer is inspecting packet capture data from a host running a dual-protocol network diagnostic service. The service transmits real-time telemetry using a connectionless transport protocol while concurrently maintaining a stateful management session using a connection-oriented transport protocol. When evaluating the transport layer encapsulation of these two flows, which structural characteristic correctly distinguishes the connectionless transport header from the connection-oriented transport header?
- The connectionless header maintains a fixed 8-byte structure consisting strictly of Source Port, Destination Port, Length, and Checksum fields.Cevap
- BThe connectionless header offloads datagram sequencing and sliding window flow control to the IPv4 header, keeping its own header size at 20 bytes.
- CThe connectionless header dynamically omits its Checksum field whenever error checking is performed at Layer 2, reducing header overhead to 4 bytes.
- DThe connectionless header includes Sequence Number and Acknowledgment Number fields but sets their values to zero to bypass reliability checks.
Cevap
The connectionless transport header (UDP) maintains a minimalist, fixed 8-byte header structure containing only Source Port, Destination Port, Length, and Checksum fields, whereas connection-oriented TCP headers require at least 20 bytes to accommodate sequencing, acknowledgments, window size, and control flags.
The correct answer accurately describes the standard UDP header structure. UDP operates as a lightweight, connectionless protocol with a fixed 8-byte header overhead. It comprises exactly four fields, each 16 bits (2 bytes) in length: Source Port, Destination Port, Length, and Checksum. This minimal structure allows for rapid transmission with minimal latency and process overhead.
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Transport Layer TCP vs UDP Header Structure and Protocol Overhead