Transport and Application Services
- Explain TCP, UDP, ports, and application dependencies
- Apply the idea to evidence from a realistic technology scenario
- Justify a decision using security, reliability, cost, and user impact
Transport and Application Services
TCP provides connection-oriented, ordered delivery with retransmission; UDP has lower overhead and lets applications decide how to handle loss. Port numbers identify services on a host. The right transport depends on whether completeness, timing, or application-controlled recovery matters most.
Decision lens
Strong technical decisions connect evidence → mechanism → impact → response. Identify what the evidence shows, explain the system behavior that produced it, state the likely effect on people or data, and choose a response that addresses the cause without creating unnecessary disruption.
A live voice application receives one packet late and another not at all.
- 1.Waiting to retransmit old audio may be worse than a brief gap.
- 2.Real-time voice commonly prioritizes timeliness over perfect delivery.
- 3.UDP supports that design, while the application handles jitter and loss.
- 4.Signaling and account functions may still use reliable TCP connections.
Which feature is associated with TCP?
Which response best demonstrates complete reasoning about TCP, UDP, ports, and application dependencies?
For a scenario about TCP, UDP, ports, and application dependencies, identify the decisive evidence before naming a response. A defensible conclusion here is: Different parts of one application can choose different transports based on their requirements.
Answer the 2 checkpoints as you read.
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