7.1.5 Check Your Understanding – Ethernet Switching Answers

1. Which part of an Ethernet Frame uses a pad to increase the frame field to at least 64 bytes?

  • EtherType
  • Preamble
  • Start of Frame Delimiter
  • Data field

Explanation: All frames must be at least 64 bytes long. Additional bits called a “pad” are used to increase the size of small frames to the minimum size.

2. Which part of an Ethernet frame detects errors in the frame?

  • Preamble
  • Start of Frame Delimiter
  • Frame Check Sequence

Explanation: The FCS field uses a CRC to detect errors in a frame.

3. Which part of an Ethernet Frame describes the higher-layer protocol that is encapsulated?

  • EtherType
  • Preamble
  • Start of Frame Delimiter
  • Frame Check Sequence

Explanation: The EtherType field identifies the upper layer protocol that is encapsulated in the Ethernet Frame.

4. Which part of an Ethernet Frame notifies the receiver to get ready for a new frame?

  • Start of Frame Delimiter
  • Frame Check Sequence
  • Preamble
  • Data field

Explanation: The first few bytes of the preamble inform the receiver of a new frame.

5. Which data link sublayer controls the network interface through software drivers?

  • MAC
  • LLC

Explanation: The LLC sublayer is responsible for controlling the network interface card through software drivers

6. Which data link sublayer works with the upper layers to add application information for delivery of data to higher level protocols?

  • MAC
  • LLC

Explanation: The LLC works with upper layers to support higher level protocols.

7. What is a function of the MAC sublayer? (Choose three.)

  • controls access to the media
  • checks for errors in received bits
  • uses CSMA/CD or CSMA/CA to support Ethernet technology
  • communicates between software at the upper layers and the device hardware at the lower layers
  • allows multiple Layer 3 protocols to use the same network interface and media

Explanation: The MAC sublayer checks for bit errors, supports Ethernet technologies, and controls access to the media.


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