Questions and Answers
Which of the following functions are performed by the OSI Transport layer? (Select three.)
What is the basic purpose of the OSI Physical layer?
Coordinates rules for transmitting bits
Which of the following are included as part of Data Link layer specifications? (Select two.)
In the OSI model, what is the primary function of the Network layer?
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Which of the following tasks is associated with the Session layer?
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In the OSI model, which of the following functions are performed at the Presentation layer? (Select two.)
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In the OSI model, which of the following functions are performed at the Application layer? (Select all that apply.)
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Which of the following functions are performed at the Physical layer of the OSI model?
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The Data Link Layer of the OSI model is comprised of two sublayers. What are they? (Select two.)
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Which of the following are functions of the MAC sublayer? (Select two.)
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Which OSI model layer is responsible for guaranteeing reliable message delivery?
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Match each layer of the TCP/IP model on the left with the corresponding layer of the OSI model on the right.
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Match the networking function or device on the left with its associated OSI model layer on the right.
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During TCP/IP communications between two network hosts, information is encapsulated on the sending host and decapsulated on the receiving host using the OSI model. Match the information format on the left with the appropriate layer of the OSI model on the right.
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Study Notes
OSI Model Overview
- The OSI Model consists of seven layers, each with specific functions that facilitate network communication.
Transport Layer Functions
- Responsible for data segmentation and reassembly.
- Manages end-to-end flow control to ensure efficient data transmission.
- Guarantees reliable message delivery through error detection and recovery methods.
Physical Layer Purpose
- Coordinates the standards and rules for transmitting raw bits over physical media.
- Handles the physical connection between devices and the medium.
Data Link Layer Specifications
- Identifies physical network devices, ensuring they can be addressed and accessed.
- Controls how messages are transmitted across the network to maintain data integrity.
Network Layer Role
- Routes data packets between different networks, ensuring they reach their destination.
Session Layer Tasks
- Establishes, manages, and terminates connections between applications on different devices.
Presentation Layer Functions
- Encrypts and compresses data for secure transmission.
- Specifies the data format, such as file types (e.g., JPEG, MPEG).
Application Layer Functions
- Integrates network services into the host operating system for users.
- Facilitates communication between network clients and servers, enabling application interaction.
Physical Layer Functions
- Responsible for moving data across physical network cables, converting digital signals to physical signals.
Data Link Layer Sublayers
- Comprises two main sublayers:
- MAC (Media Access Control) manages device access to the local area network.
- LLC (Logical Link Control) handles communication and data packets between devices.
MAC Sublayer Functions
- Ensures devices can access the LAN efficiently, managing how data is sent and received.
- Assigns a unique hardware address to each device for identification and communication.
Reliable Message Delivery
- The Transport layer is designated for ensuring that messages are delivered reliably across the network.
TCP/IP and OSI Model Layer Matching
- TCP/IP model layers correspond to OSI model layers:
- Host-to-Host matches with Transport.
- Internet matches with Network.
- Network Access matches with Data Link.
- Application matches with Application and Presentation.
Networking Functions and OSI Model Layer Associations
- Application layer: HTTP provides web services.
- Presentation layer: ASCII supports data formatting.
- Session layer: Manages Session ID numbers for connections.
- Transport layer: Uses port numbers for communication.
- Network layer: Routers direct data packets.
- Data Link layer: Switches facilitate local network communication.
- Physical layer: Modems convert digital signals for transmission.
Encapsulation and Decapsulation
- In TCP/IP communications, data is encapsulated at the sending host and decapsulated at the receiving host:
- Segments are associated with the Transport layer.
- Packets correspond to the Network layer.
- Frames belong to the Data Link layer.
- Bits are related to the Physical layer.
Studying That Suits You
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Description
Test your knowledge of the OSI Model with these flashcards. Covering layers such as Transport, Physical, and Data Link, this quiz helps reinforce your understanding of their functions and purposes. Perfect for anyone studying networking concepts and protocols.
