Revision Test - OSI Model

The OSI Model is a conceptual framework that standardizes the functions of a communication system into seven different layers. Each layer has a specific role and interacts with the layers above and below it to ensure efficient and reliable communication. These layers are: Physical, Data Link, Network, Transport, Session, Presentation, and Application. Therefore, the correct answer is 7 layers in the OSI Model.

The OSI Model is a conceptual framework that standardizes the functions of a communication system into seven different layers. Each layer in the OSI Model provides services to the layer above it and receives services from the layer below it. This hierarchical structure allows for modular design and facilitates interoperability between different network devices and protocols. Therefore, the statement that each layer provides services to the adjacent layer is true.

The protocols supported by the Application Layer are HTTP, HTTPs, FTP, and SMTP. These protocols are used for various purposes in the application layer of the network stack. HTTP is used for transferring hypertext documents, HTTPs is a secure version of HTTP, FTP is used for file transfer, and SMTP is used for sending email. These protocols enable communication between different applications running on different devices over a network.

Layer 5,6,7 are called User Support layers because they are responsible for providing services directly to the end user. Layer 5, the Session layer, manages the connections and sessions between applications. Layer 6, the Presentation layer, handles data formatting and encryption. Layer 7, the Application layer, allows users to interact with the network and provides services such as email, file transfer, and web browsing. These layers focus on supporting user applications and ensuring a seamless user experience.

In the OSI Model, logical addressing is not done by the Transport Layer. Logical addressing is actually performed by the Network Layer. The Transport Layer is responsible for providing reliable end-to-end communication between hosts, while the Network Layer handles logical addressing and routing of data packets across different networks. Therefore, the correct answer is False.

In the OSI Model, the Data Link Layer is responsible for providing physical addressing. This means that it adds a header to the data being transmitted, which includes the source and destination MAC addresses. This allows the data to be correctly delivered to the intended recipient on the local network. Therefore, the statement that physical addressing is done by the Data Link Layer in the OSI Model is true.

Layers 1, 2, and 3 are called the Network Support Layer because they provide support for the network infrastructure. Layer 1, the Physical layer, deals with the physical transmission of data over the network. Layer 2, the Data Link layer, is responsible for the reliable transmission of data between nodes on a network. Layer 3, the Network layer, handles the routing of data packets across different networks. These layers work together to ensure the smooth functioning and support of the network infrastructure.

The layer concerned with the syntax and semantics of the information exchanged between two systems is the Presentation layer. This layer is responsible for formatting, encrypting, and compressing the data to be transmitted. It ensures that the data is in a format that can be understood by the receiving system and handles any necessary data conversions. The Presentation layer also handles tasks such as data compression and encryption to ensure secure and efficient communication between the systems.

The Transport Layer is considered the heart of the OSI model because it is responsible for end-to-end communication between devices. It ensures reliable and efficient delivery of data by providing error detection, flow control, and congestion control mechanisms. The Transport Layer also establishes and terminates connections between devices and manages data segmentation and reassembly. Without the Transport Layer, communication between devices would not be possible, making it a critical component of the OSI model.

OSI stands for Open System Interconnection. It is a conceptual framework that standardizes the functions of a communication system into seven different layers. These layers include physical, data link, network, transport, session, presentation, and application layers. The OSI model helps in understanding how different network protocols and technologies interact with each other to enable communication between devices in a network. It provides a structured approach for designing and implementing network protocols, ensuring interoperability between different systems and vendors.

The layers called as Hardware/Lower Layers are the Network Layer, Data Link Layer, and Physical Layer. These layers are responsible for the actual transmission and reception of data over the network. The Network Layer handles routing and forwarding of data packets, the Data Link Layer manages the physical transmission of data between nodes on a network, and the Physical Layer deals with the actual hardware and physical connections used for data transmission. These layers are considered lower layers because they are closer to the physical hardware components of the network.

The Network Layer is responsible for routing packets from source to destination. This process involves moving packets across the network using the most appropriate paths. So, the correct answer is “Network”.