OSI Model — Set 7
Computers · OSI मॉडल · Questions 61–70 of 70
Which layer converts bits into electrical or optical signals?
Correct Answer: B. Physical Layer
The Physical Layer is responsible for the actual transmission of data as physical signals. It defines the hardware, cables, and signal levels used for communication. This layer ensures that digital 1s and 0s are successfully moved across the wires.
Which layer is responsible for 'Segmentation' of the data?
Correct Answer: B. Transport Layer
The Transport Layer breaks down large messages into smaller segments for easier transmission. Each segment is numbered so it can be put back together in the right order at the destination. This helps in managing network traffic more efficiently.
What is the data unit at the Data Link Layer called?
Correct Answer: A. Frame
At the Data Link Layer, data units are called 'Frames'. Frames include headers and trailers that contain physical addresses and error-checking information. This terminology helps in specifying the level of network troubleshooting.
Which OSI layer provides the services for 'E-mail' and 'File Transfer'?
Correct Answer: B. Application Layer
The Application Layer is where protocols like SMTP (for email) and FTP (for file transfer) operate. It provides the software-level services that users interact with directly. It is the topmost layer in the seven-layer model.
Which layer is known for providing 'Node-to-Node' delivery?
Correct Answer: B. Data Link Layer
The Data Link Layer ensures that data is accurately transferred between two directly connected nodes. it handles the local movement of data within a single physical link. The Network Layer, by contrast, handles delivery across multiple networks.
Which layer handles the 'Logical Addressing' of a network?
Correct Answer: C. Network Layer
The Network Layer is responsible for logical addressing, primarily through IP addresses. This allows data to be sent to a specific destination even if it's in a different part of the world. it is the brain of the routing process in networking.
Which layer acts as a 'Translator' for the network?
Correct Answer: B. Presentation Layer
The Presentation Layer translates data between the format the application uses and the standard network format. it ensures that computers with different data representations can still communicate. it handles tasks like character encoding (ASCII to EBCDIC).
Which layer is responsible for 'Checkpoints' and recovery during a file transfer?
Correct Answer: B. Session Layer
The Session Layer allows applications to set checkpoints during a data transfer. If the connection fails, the transfer can resume from the last successful checkpoint instead of starting over. This is very useful for large file downloads.
What is the correct sequence of the first three layers starting from the bottom?
Correct Answer: B. Physical-Data Link-Network
Starting from the bottom (Layer 1), the first three layers are Physical, Data Link, and Network. These are often called the 'Network Support' layers as they handle the hardware and transmission. The upper layers focus more on the user applications.
At which layer of the OSI model does a 'Bridge' operate?
Correct Answer: A. Layer 2
A Bridge is a network device that functions at the Data Link Layer (Layer 2). it filters and forwards data based on MAC addresses to connect separate network segments. Bridges help in reducing network congestion within a local area network.