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Difficulty: EasyOSI Model Layers and Functions

An administrator is auditing network traffic and needs to categorize functions performed at Layer 3 (Network Layer) of the OSI model. Which of the following functions operate at Layer 3? (Select TWO.)

  1. Evaluating logical IP addresses to determine routing paths across networksAnswer
  2. Encapsulating transport layer segments into network packetsAnswer
  3. C
    Managing physical MAC addresses to deliver frames within a single broadcast domain
  4. D
    Establishing and maintaining port-to-port connections between end systems using TCP or UDP

Answer

Evaluating logical IP addresses to determine routing paths across networks, and encapsulating transport layer segments into network packets.
Evaluating logical IP addresses for routing across subnets and encapsulating Transport segments into Network packets are fundamental Layer 3 (Network Layer) duties.

Step-by-Step Solution

1
Identify the primary functions performed at Layer 3 (Network Layer) of the OSI model.
Layer 3 is responsible for logical addressing (IPv4/IPv6 addresses), packet creation, and path determination (routing) across interconnected subnets.
Understanding layer responsibilities enables accurate classification of network operations.
2
Evaluate each choice against Layer 3 characteristics.
Logical IP addressing and segment-to-packet encapsulation are Layer 3 processes. Hardware MAC addressing belongs to Layer 2, while port multiplexing with TCP/UDP belongs to Layer 4.
Differentiating PDUs and operational mechanisms isolates Network layer processes from Data Link and Transport layer processes.

Key Concept

OSI Layer 3 (Network Layer) Functions and Protocols
Estimated Time:45s
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Topics

OSI Model Layers and Functions

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