6.1.5 Check Your Understanding – Purpose of the Data Link Layer Answers

1. What is another name for the OSI data link layer?

  • Layer 1
  • Layer 2
  • Layer 3
  • Layer 6

Explanation: The data link layer is Layer 2 of the OSI model.

2. The IEEE 802 LAN/MAN data link layer consists of which two sublayers? (Choose two.)

  • Network Control Protocol
  • Logical Link Control
  • Media Access Control
  • Link Control Protocol

Explanation: The data link layer consists of two sublayers. These are Logical Link Control (LLC) and Media Access Control (MAC)

3. What is the responsibility of the MAC sublayer?

  • Adds Layer 3 addresses to the frame
  • Communicates with the network layer (Layer 3)
  • Provides the method to get the frame on and off the media
  • Transmits the bits on the media

Explanation: The MAC sublayer of the data link layer is responsible for getting frames on and off the media.

4. What Layer 2 function does a router perform? (Choose three.)

  • Accepts a frame from a medium
  • De-encapsulates the frame
  • Refers to its Layer 3 routing table for a matching destination network
  • Re-encapsulates the packet into a new frame

Explanation: Routers perform four functions at Layer 2. They accept a frame from the media, de-encapsulate the packet from a frame, re-encapsulate the packet into a new frame, and forwards the new frame appropriate to the medium of that segment of the physical network.

5. The media access control method used depends on which two criteria?

  • Layer 3 IP protocol
  • Media sharing
  • Topology
  • Transport layer protocol
  • Type of data

Explanation: The two criteria for determining the media access control method used are the type of media sharing involved and the topology.

6. Which organization defines standards for the network access layer (i.e., the OSI physical and data link layers)?

  • Cisco
  • IANA
  • IEEE
  • IETF

Explanation: The IEEE defines standards for the TCP/IP network access layer, which are the OSI physical and data link layers.

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