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Difficulty: Very hardOSI Model Layers and Functions

Match each network troubleshooting artifact or protocol header field to the primary OSI model layer at which it functions.

  • Ethernet frame header containing a 48-bit MAC address and LLC control fieldLayer 2 - Data Link Layer
  • TCP segment header containing a 32-bit sequence number and window sizeLayer 4 - Transport Layer
  • IPv6 packet header containing a Hop Limit field and 128-bit source addressLayer 3 - Network Layer
  • TLS protocol handshake exchanging record formats and cipher suite specificationsLayer 6 - Presentation Layer

Answer

Ethernet framing and MAC addressing correspond to Layer 2 (Data Link Layer). TCP sequence numbers and windowing correspond to Layer 4 (Transport Layer). IPv6 headers and Hop Limits correspond to Layer 3 (Network Layer). TLS encryption and data syntax negotiation correspond to Layer 6 (Presentation Layer).
Each artifact uniquely maps to its respective OSI layer depending on whether it provides physical node framing (Data Link Layer), logical network routing (Network Layer), process-to-process delivery control (Transport Layer), or data format encryption (Presentation Layer).

Step-by-Step Solution

1
Analyze physical framing and local media control artifacts.
Ethernet frames, MAC addresses, and LLC fields belong to Layer 2 (Data Link Layer).
Layer 2 handles physical addressing and frame construction across a single local network segment.
2
Analyze transport flow control and connection delivery metrics.
TCP sequence numbers and sliding window mechanisms belong to Layer 4 (Transport Layer).
Layer 4 manages process-to-process transport reliability, sequencing, and flow control.
3
Analyze logical host addressing and inter-network hop controls.
IPv6 packet headers and Hop Limit fields belong to Layer 3 (Network Layer).
Layer 3 manages logical addressing and packet routing across independent subnets.
4
Analyze data syntax translation and security formatting.
TLS negotiation and cipher suite record formatting belong to Layer 6 (Presentation Layer).
Layer 6 manages syntax formatting, compression, and cryptographic encryption/decryption before passing data to the application layer.

Key Concept

OSI Model Layer Functions and Protocol Header Fields
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Topics

OSI Model Layers and Functions

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