Examkin

Question

Difficulty: EasyOSI Model Layers and Functions

A network administrator is reviewing protocol operations at Layer 4 (Transport Layer) of the OSI model. Which of the following core functions are performed at this layer? (Select TWO.)

  1. Process-to-process multiplexing using port numbersAnswer
  2. Flow control and connection management using segment sliding windowsAnswer
  3. C
    Logical IP addressing and path determination across intermediate routers
  4. D
    Hardware MAC addressing and frame error detection using a FCS trailer

Answer

The Transport Layer (Layer 4) provides process-to-process multiplexing via port numbers and flow control through segment sequencing and sliding windows.
Layer 4 (Transport Layer) manages end-to-end communication between software processes on different hosts. Key responsibilities include process-to-process multiplexing using TCP/UDP port numbers and flow control (such as sliding window mechanisms in TCP) to prevent sender buffer overrun.

Step-by-Step Solution

1
Identify the OSI layer referenced in the question stem
The target is Layer 4, the Transport Layer.
Understanding which OSI layer is being queried narrows down the protocol data units (PDUs) and functional scope.
2
Evaluate each function against Layer 4 duties
Multiplexing via port numbers and flow control/windowing are primary responsibilities of Transport layer protocols like TCP and UDP.
Layer 4 is responsible for end-to-end communication services between process sockets.
3
Eliminate functions associated with lower OSI layers
Logical IP routing is a Layer 3 (Network) task, and MAC address framing is a Layer 2 (Data Link) task.
Differentiating adjacent layer functions prevents misidentifying PDU operations.

Key Concept

OSI Transport Layer (Layer 4) Primary Functions
Estimated Time:1m 0s
Rate this question

Topics

OSI Model Layers and Functions

More questions from this topic