Mindtap Computing, 2 Terms (12 Months) Printed Access Card For Dean/andrews/west's Network+ Guide To Networks, 7th
Mindtap Computing, 2 Terms (12 Months) Printed Access Card For Dean/andrews/west's Network+ Guide To Networks, 7th
7th Edition
ISBN: 9781305658950
Author: Tamara Dean, Jean Andrews, Jill West
Publisher: Cengage Learning
Expert Solution & Answer
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Chapter 11, Problem 1RQ
Program Description Answer

LANs and WANs supports same protocol at the “Layer 3” of OSI model.

Hence, the correct answer is option “B”.

Expert Solution & Answer
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Explanation of Solution

Layer 3: Network layer

  • It is the third level of the Open System Interconnection Model (OSI Model).
  • Network layer performs the routing of packet from source to destination.
  • For routing, it converts the data into packets, and after reaching the destination, it converts back to the data.
  • The primary responsibilities of this layer is to set up a logical connection, data forwarding, routing and error reporting.
  • Both LANs and WANs use the same protocol of layer 3 and other higher of OSI model.

Explanation for incorrect options:

Layer 2: Data link layer

  • It makes the transmission of data reliable, which is provided by the physical layer.
  • For reliable transfer, it divides the data into data frames and transmits through the communication channel.
  • At the destination, it checks for the transmission error and sends the acknowledgement to the source.

Hence, the option “A” is wrong.

Layer 4: Transport layer

  • Its purpose is to provide the reliable transfer of data between two processes in the computer.
  • This layer ensures the error-free delivery, no loss of data, and duplication.

Hence, the option “C” is wrong.

Layer 5: Session layer

  • Session layer deals with how two devices establish a connection, access, and control the connection in the network.
    • It controls the data transfer between two processes in the communicating host.
    • It establishes the logical connection between the source and destination.

Hence, the option “D” is wrong.

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