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Difficulty: HardConnection-Oriented vs Connectionless Protocols

A network engineer is designing a transport layer architecture for an enterprise safety infrastructure. The deployment consists of two distinct components: a real-time emergency alert service that must rapidly transmit 64-byte emergency broadcast triggers to thousands of workstation endpoints simultaneously without session setup delay, and an automated audit compliance service that must transfer large system logs to a centralized server where every packet must be acknowledged and processed strictly in order. Which of the following transport protocol selections best satisfies both operational requirements while optimizing network overhead?

  1. Utilize UDP for the emergency alert trigger service and TCP for the audit compliance service.Answer
  2. B
    Utilize TCP for the emergency alert trigger service to ensure missed triggers are retransmitted, and UDP for the audit compliance service to prevent central server buffer exhaustion.
  3. C
    Utilize Data Link layer Ethernet frames directly for the log audit service to ensure reliability, and Transport layer UDP for the emergency alert triggers.
  4. D
    Utilize UDP on port 443 for guaranteed log audit delivery to bypass stateful firewalls, and TCP on port 53 for real-time emergency alert triggers.

Answer

Utilize UDP for the emergency alert trigger service and TCP for the audit compliance service.
UDP is connectionless and header-light (8 bytes), eliminating three-way handshake delays and retransmission buffers, which makes it ideal for real-time emergency alert triggers. TCP is connection-oriented, providing sequence numbers, acknowledgments, and flow control necessary for complete, ordered audit log delivery.

Step-by-Step Solution

1
Analyze the requirements for the emergency alert trigger service.
The alert service requires immediate, low-latency transmission of small messages to many endpoints without session establishment delays.
Connectionless UDP has minimal header overhead (8 bytes) and requires no three-way handshake, making it optimal for time-critical broadcast/multicast notifications.
2
Analyze the requirements for the audit compliance log transfer service.
The audit service requires guaranteed delivery, error checking, and strict in-order packet processing.
Connection-oriented TCP utilizes sequence numbers, acknowledgments (ACKs), retransmissions, and windowing to guarantee complete and ordered data delivery.
3
Map requirements to the appropriate transport protocol pair.
Match UDP to the alert trigger component and TCP to the audit log compliance component.
This alignment satisfies both the latency/overhead constraints of the alerts and the reliability constraints of the log audit.

Key Concept

Transport Layer Protocol Selection (Connection-Oriented TCP vs. Connectionless UDP)
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Topics

Connection-Oriented vs Connectionless Protocols

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