EBK NETWORK+ GUIDE TO NETWORKS
8th Edition
ISBN: 9781337671644
Author: ANDREWS
Publisher: CENGAGE LEARNING - CONSIGNMENT
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Expert Solution & Answer
Chapter 10, Problem 1RQ
Program Description Answer
At the Application layer of the OSI model, the proxy servers manage security.
Hence, the correct answer is option “C”.
Expert Solution & Answer
Explanation of Solution
OSI model:
Network is the collection of two or more computers linked together.
- OSI (Open System Interconnection) is a reference model for the communication network.
- Communication network is the process of allowing nodes to communicate or exchange the data between the nodes through the link.
- It provides seven-layer architecture for the OSI model.
Seven layers of OSI model:
- Physical layer
- Data link layer
- Network layer
- Transport
- Session
- Presentation
- Application
Layer 7: Application layer:
- It interacts with the software application program and provides semantic of data.
- It is the highest layer in the OSI model and close to the end user.
- At the Application layer of the OSI model, the proxy servers manage security.
Explanation for incorrect options:
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.
Hence, the option “A” is wrong.
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 “B” 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 “D” is wrong.
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Chapter 10 Solutions
EBK NETWORK+ GUIDE TO NETWORKS
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