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Difficulty: HardConnection-Oriented vs Connectionless Protocols

A network administrator is conducting a packet capture analysis to troubleshoot performance variations between a legacy database synchronization utility and a newly deployed real-time voice conferencing application. The analysis reveals distinct transport-layer operational characteristics between the two streams. Which of the following statements accurately contrast connection-oriented and connectionless transport-layer protocols in this environment? (SELECT TWO)

  1. TCP relies on a three-way handshake (SYN, SYN-ACK, ACK) to establish session state and synchronize sequence numbers before payload transmission begins, whereas UDP transmits datagrams immediately without prior connection negotiation.Answer
  2. B
    UDP headers contain sequence and acknowledgment number fields to ensure ordered delivery at the destination, whereas TCP headers omit these fields to minimize protocol processing delay.
  3. TCP uses dynamic sliding window mechanisms to perform flow control and manage sender transmission rates based on receiver buffer availability, while UDP provides no native flow control mechanisms.Answer
  4. D
    UDP requires intermediate Layer 3 routers to maintain active connection state tables for each active flow, whereas TCP delegates connection tracking entirely to Layer 2 switches.
  5. E
    TCP uses 16-bit port numbers to identify destination processes, while UDP relies exclusively on Layer 2 MAC addresses to route payloads to upper-layer applications.

Answer

The statement regarding TCP utilizing a three-way handshake prior to payload transfer while UDP transmits immediately without setup, and the statement regarding TCP providing dynamic flow control via sliding windows while UDP provides no native flow control, are both correct.
Connection-oriented protocols like TCP establish an explicit state between endpoints via a three-way handshake prior to data exchange and use dynamic sliding windowing for flow control. Connectionless protocols like UDP send datagrams immediately without establishing state or offering native flow control.

Step-by-Step Solution

1
Evaluate session establishment mechanisms for TCP and UDP.
TCP requires a three-way handshake (SYN, SYN-ACK, ACK) to synchronize sequence numbers and establish state before data transfer. UDP transmits datagrams immediately without negotiation.
Connection-oriented protocols build endpoint state prior to data exchange, while connectionless protocols do not.
2
Evaluate reliability and header structure mechanisms.
TCP headers include 32-bit sequence numbers and acknowledgment numbers to reorder segments and request retransmissions. UDP headers lack sequence/ACK fields.
Connectionless protocols prioritize low overhead over guaranteed delivery.
3
Evaluate flow control and traffic management mechanisms.
TCP implements sliding window flow control to adjust transmission rates according to receiver capacity. UDP has no built-in flow control.
TCP maintains receiver feedback loops to manage throughput and prevent buffer exhaustion.

Key Concept

Connection-Oriented vs Connectionless Transport Protocols (TCP vs UDP)
Estimated Time:2m 0s
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Topics

Connection-Oriented vs Connectionless Protocols

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