Examkin

Question

Difficulty: MediumOSI Model Layers and Functions

Match each OSI model layer on the left with its primary operational function and corresponding Protocol Data Unit (PDU) characteristics on the right.

  • Data Link Layer (Layer 2)Encapsulates data into Frames using physical MAC addressing for node-to-node transmission within a local network segment.
  • Network Layer (Layer 3)Encapsulates data into Packets with logical IP addresses to perform path determination and routing across networks.
  • Transport Layer (Layer 4)Organizes data into Segments using port numbers to manage end-to-end process-to-process communication and flow control.
  • Presentation Layer (Layer 6)Handles syntax translation, data compression, and encryption to ensure data is properly formatted for application use.

Answer

The Data Link Layer (Layer 2) pairs with node-to-node frame delivery via MAC addresses; the Network Layer (Layer 3) pairs with packet routing via IP addresses; the Transport Layer (Layer 4) pairs with end-to-end process multiplexing via segments and ports; and the Presentation Layer (Layer 6) pairs with syntax translation, compression, and encryption.
Each OSI layer serves a specific purpose in network communications: Layer 2 uses Frames and MAC addresses for local transmission; Layer 3 uses Packets and IP addresses for routing; Layer 4 uses Segments and port numbers for transport multiplexing; and Layer 6 provides data translation, compression, and encryption.

Step-by-Step Solution

1
Analyze Layer 2 (Data Link Layer) characteristics.
Layer 2 builds Frames using MAC addressing for physical network segment communication.
Hardware addressing and framing are defined at the Data Link Layer.
2
Analyze Layer 3 (Network Layer) characteristics.
Layer 3 manages Packets and IP routing across subnets.
Path selection and logical addressing occur at the Network Layer.
3
Analyze Layer 4 (Transport Layer) characteristics.
Layer 4 uses Segments and port numbers for end-to-end communication.
Process-to-process communication and multiplexing are handled by TCP/UDP at the Transport Layer.
4
Analyze Layer 6 (Presentation Layer) characteristics.
Layer 6 performs encryption, compression, and format conversion.
Data syntax standardization between sender and receiver occurs at the Presentation Layer.

Key Concept

OSI Layer Functions and PDU Mapping
Rate this question

Topics

OSI Model Layers and Functions

More questions from this topic