Tag: osi-model

To answer this question, you need to understand the OSI (Open Systems Interconnection) model. The OSI model is a conceptual framework that standardizes the functions of a communication system into seven distinct layers.

Let's go through each option to understand why it is correct or incorrect:

Option A) physical - This option is incorrect because the physical layer is responsible for the actual transmission and reception of data bits over a physical medium, such as cables or wireless signals.

Option B) transport - This option is incorrect because the transport layer is responsible for reliable end-to-end data delivery. It ensures that data is delivered error-free, in the correct order, and with flow control and congestion control mechanisms. Examples of protocols that operate at the transport layer include TCP (Transmission Control Protocol) and UDP (User Datagram Protocol).

Option C) network - This option is correct because routers operate at the network layer. The network layer is responsible for logical addressing, routing, and the delivery of packets from the source to the destination across multiple networks. Routers examine the destination IP address in the packet's header and make decisions on how to route the packet to its destination.

Option D) MAC sublayer of the data link layer - This option is incorrect because the MAC (Media Access Control) sublayer is a component of the data link layer, which is responsible for node-to-node data transfer. The MAC sublayer is primarily concerned with the control of access to the physical medium and the addressing of devices on a local network. Ethernet is an example of a protocol that operates at the data link layer.

The correct answer is C) network. Routers operate at the network layer and are responsible for routing packets between networks based on the destination IP address.

• Thanks
• Wrong explanation

To answer this question, you need to understand the layers of the OSI model and their functions.

The OSI model is a conceptual framework that standardizes the functions of a communication system into seven layers. Each layer has a specific role and interacts with the layers above and below it.

The correct answer is A) data link.

The data link layer is responsible for the packaging of bits into frames. It takes the raw stream of bits from the physical layer and organizes them into frames, which can be transmitted over the network. The data link layer also adds necessary control information, such as destination and source addresses, to the frames.

Option B) transport is incorrect because the transport layer is responsible for the reliable delivery of data between end systems, not the packaging of bits into frames.

Option C) physical is incorrect because the physical layer is responsible for the transmission of raw bits over the physical medium, not the packaging of bits into frames.

Option D) presentation is incorrect because the presentation layer is responsible for data formatting and encryption, not the packaging of bits into frames.

Option E) application is incorrect because the application layer is responsible for providing services to the end-user applications, not the packaging of bits into frames.

Therefore, the correct answer is A) data link because it is the layer that packages bits into frames.

• Thanks
• Wrong explanation

To answer this question, you need to understand the concept of the OSI (Open Systems Interconnection) model. The OSI model is a conceptual framework that standardizes the functions of a communication system into seven different layers.

Each layer of the OSI model has a specific set of functions and protocols associated with it. The upper layers of the OSI model are responsible for providing services and interfaces to the user or application.

The upper layer protocols include the application, presentation, and session layers. These layers are responsible for tasks such as data formatting, encryption/decryption, session management, and application-specific functions.

Let's go through each option to understand why it is correct or incorrect:

Option A) presentation and session - This option is incorrect because it only includes two out of the three upper layer protocols. The correct answer should include all three: application, presentation, and session.

Option B) application and presentation - This option is incorrect because it only includes two out of the three upper layer protocols. The correct answer should include all three: application, presentation, and session.

Option C) application, presentation, and session - This option is correct because it includes all three upper layer protocols: application, presentation, and session.

Option D) application, presentation, session, and transport - This option is incorrect because it includes the transport layer, which is not part of the upper layers. The upper layers consist of the application, presentation, and session layers.

Option E) application - This option is incorrect because it only includes one out of the three upper layer protocols. The correct answer should include all three: application, presentation, and session.

The correct answer is Option C) application, presentation, and session. This option is correct because it includes all three upper layer protocols according to the OSI model.

• Thanks
• Wrong explanation

To answer this question, we need to understand the different layers of the OSI model.

The OSI (Open Systems Interconnection) model is a conceptual framework that standardizes the functions of a communication system into seven different layers. These layers are:

1. Physical Layer: This layer deals with the physical transmission of data over the network, including the electrical and mechanical specifications of the physical media.

2. Data Link Layer: This layer provides reliable data transfer between two directly connected nodes and is responsible for error detection and correction.

3. Network Layer: This layer is responsible for the routing of data packets across different networks. It determines the best path for data transmission and handles logical addressing.

4. Transport Layer: This layer provides end-to-end reliable data transfer between hosts. It ensures that data is delivered in the correct order and without errors.

5. Session Layer: This layer establishes, manages, and terminates communication sessions between applications.

6. Presentation Layer: This layer handles data formatting, encryption, and compression for the application layer.

7. Application Layer: This layer provides services directly to the end user or application, such as file transfer, email, and web browsing.

Based on the given options, flow control takes place at the transport layer (Option C). The transport layer is responsible for controlling the flow of data between two hosts to ensure that neither the sender overwhelms the receiver nor the receiver gets overloaded with data.

Therefore, the correct answer is C. transport.

• Thanks
• Wrong explanation