OSI Model

OSI Model

The OSI model is a seven-layer framework that standardizes network communication. Each layer has a specific function in data transmission.

Application layer

Sessionlayer

Networklayer

Physicallayer

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Pressentationlayer

Transportlayer

Data-link layer

TIMELINE Diagram

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Application Layer:

• The application layer is the top layer of the OSI model. It provides the interface and protocols for end-user applications to communicate over a network. This layer handles services like email, file transfer, and web browsing, using protocols such as HTTP, FTP, and SMTP. It directly interacts with software applications to enable network communication.

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Session Layer

• The session layer manages and controls communication sessions between devices. It establishes, maintains, and terminates sessions, ensuring data is exchanged in an organized manner. It also handles dialogue control (full or half-duplex) and synchronization (like checkpoints for resuming interrupted sessions).

Data-link layer...

The Data Link Layer ensures reliable data transfer over a physical link using framing, error detection, MAC addressing, and flow control. It manages access to the medium (Ethernet, Wi-Fi) and enables device communication within a network.

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Presentation Layer:

• The presentation layer is responsible for translating, encrypting, and compressing data for the application layer. It ensures that data sent between systems is in a readable format, handling tasks like data encoding (e.g., ASCII, JPEG) and encryption/decryption to maintain security. It also deals with data compression to optimize transmission.

Transport layer

The transport layer is responsible for reliable end-to-end communication between devices over a network. It handles tasks like breaking data into smaller segments, error detection, flow control, and ensuring that data is delivered correctly. Key protocols include TCP (reliable, connection-oriented) and UDP (faster, connectionless). It ensures efficient and error-free data transmission between devices.

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Physical layer...

The Physical Layer is responsible for transmitting raw bits over a physical medium like cables or wireless signals. It defines hardware specifications, transmission modes (simplex, half-duplex, full-duplex), and encoding methods. Common technologies include Ethernet cables, fiber optics, Wi-Fi, and hardware like NICs and hubs. It ensures bit transmission but does not handle addressing or security

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Network layer...

The Network Layer manages routing and addressing to ensure data packets reach their destination across multiple networks. It handles IP addressing, packet forwarding, and path selection. Key protocols include IPv4, IPv6, ICMP, and routing protocols (OSPF, BGP).

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