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Auria > OSI Model > Flashcards

OSI Model Flashcards

1
Q

Layer 1

A

Physical

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2
Q

Layer 2

A

Data Link

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3
Q

Layer 3

A

Network

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4
Q

Layer 4

A

Transport

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5
Q

Layer 5

A

Session

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6
Q

Layer 6

A

Presentation

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7
Q

Layer 7

A

Application

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8
Q

Why is the OSI Model important?

A

Standardization:
Provides a universal framework for understanding and developing network protocols.
Interoperability:
Ensures that different hardware and software systems can communicate effectively.
Troubleshooting:
Helps network engineers isolate and resolve issues by focusing on specific layers.
Modularity:
Changes in one layer do not affect others, making it easier to update and improve protocols.

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9
Q

Purpose of Physical Layer

A

Physical connection between devices and the transmission of raw binary data (0s and 1s) over a physical medium.

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10
Q

Purpose of Data Link Layer

A

Provides reliable transmission of data across a physical network link by detecting and possibly correcting errors.

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11
Q

Purpose of Network Layer

A

Handles the routing and forwarding of data between devices across different networks.

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12
Q

Purpose of Transport Layer

A

Ensures reliable data delivery between devices, including error recovery and flow control.

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13
Q

Purpose of Session Layer

A

Manages and controls the establishment, maintenance, and termination of communication sessions between devices.

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14
Q

Purpose of Presentation Layer

A

Translates and formats data to ensure it can be understood by the application layer and by the receiving device.

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15
Q

Purpose of Application Layer

A

Provides network services to end users and interfaces with applications. It’s the layer users interact with directly.

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16
Q

What are the functions of the Physical Layer?

A

Converts digital data into electrical, optical, or radio signals for transmission.
Defines cables, connectors, voltages, frequencies, and data rates.

17
Q

What are the functions of the Data Link Layer?

A

Organizes data into frames for transmission.
Handles MAC (Media Access Control) addresses to identify devices on the same network.
Ensures error-free delivery using checksums and acknowledgments.

18
Q

What are the functions of the Network Layer?

A

Divides data into packets.
Determines the best path for data to reach its destination (routing).
Uses IP addresses for addressing and delivery.

19
Q

What are the functions of the Transport Layer?

A

Divides data into segments for transmission.
Provides error detection and correction.
Ensures complete and ordered delivery of data using retransmissions when necessary.
Protocols:
TCP (Transmission Control Protocol): Reliable, connection-oriented.
UDP (User Datagram Protocol): Unreliable, connectionless, faster.

20
Q

What are the functions of the Session Layer?

A

Synchronizes communication by establishing, maintaining, and ending sessions.
Coordinates dialog control (full-duplex, half-duplex).

21
Q

What are the functions of the Presentation Layer?

A

Handles data encryption, decryption, compression, and conversion.
Ensures compatibility between systems with different data formats.

22
Q

What are the functions of the Application Layer?

A

Handles application-level protocols for specific services.
Facilitates file transfers, email, and web browsing.

23
Q

Examples of the Physical Layer

A

Ethernet cables, fiber optics, Wi-Fi signals.
Hubs, repeaters.

24
Q

Examples of the Data Link Layer

A

Ethernet (IEEE 802.3), Wi-Fi (IEEE 802.11).
Switches, bridges.

25
Q

Examples of the Network Layer

A

Internet Protocol (IP), IPv4, IPv6.
Routers.

26
Q

Examples of the Transport Layer

A

TCP, UDP.
Port numbers (e.g., port 80 for HTTP, port 443 for HTTPS).

27
Q

Examples of the Session Layer

A

Session management in Remote Procedure Calls (RPC).
NetBIOS, SMB.

28
Q

Examples of the Presentation Layer

A

SSL/TLS encryption.
Data formats like JPEG, PNG, MP4, ASCII, EBCDIC.

29
Q

Examples of the Application Layer

A

HTTP/HTTPS (web browsing), SMTP (email), FTP (file transfer), DNS (domain name resolution).

Auria (7 decks)

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