This section contains carefully selected MCQs and Previous Year Questions with explanations to help students understand concepts and prepare effectively for examinations, interviews, and competitive tests.
Q: 1__________ is a device that combines a large number of low-speed transmission lines into a high-speed line.
Option A
A Multiplexer (MUX) is a communication device that combines data from multiple input lines into a single high-speed transmission line.
It allows several low-speed signals to share one high-speed communication channel, which improves the utilization of the transmission medium.
For example, if several low-speed devices need to send data through one high-speed communication link, a multiplexer combines their signals at the sending end.
At the receiving end, a Demultiplexer (DEMUX) separates the combined signal back into the individual signals.
Q: 2Devices in Data Link Layer are _____________.
Option B
In computer networking, each OSI layer is associated with specific devices based on the type of work it performs.
Devices working at Data Link Layer must understand MAC addresses and operate on frames.
Switch:
Bridge:
| DEVICE | LAYER | FUNCTION |
|---|---|---|
| Modem | Physical Layer | Converts digital signals into analog and vice versa. |
| Repeater | Physical Layer | Regenerates weak signals to extend transmission distance. |
| Hub | Physical Layer | Sends incoming data to all connected devices without filtering. |
| Switch | Data Link Layer | Forwards frames to the correct port using MAC addresses. |
| Bridge | Data Link Layer | Connects LAN segments and filters traffic using MAC addresses. |
| Router | Network Layer | Routes packets between networks using IP addresses. |
Q: 3
Match List—1 with List—2?
| List—1 | List—2 |
|---|---|
| (i) Repeater | A. Network Layer |
| (ii) Bridge | B. Transport Layer |
| (iii) Routers | C. Data Link Layer |
| (iv) Gateway | D. Physical Layer |
Option C
Repeater: A repeater works with signals at the Physical Layer. It receives a signal, regenerates it, and transmits it again to extend the communication distance.
Bridge: A bridge works at the Data Link Layer and uses MAC addresses to filter and forward frames between network segments.
Router: A router operates at the Network Layer and uses IP addresses to determine the appropriate path for packets.
Gateway: In the classification used by this question, the gateway is matched with the Transport Layer because it can perform protocol conversion at higher layers.
Q: 4__________ are used to connect a computer to a network.
Option B
A Gateway is a device or software component that connects two different networks and lets data move between them. It often also translates protocols, which is why it is called the “entry point” or “exit point” between networks.
Q: 5The size of MAC address (in bits) is—
Option B
A MAC (Media Access Control) address is a hardware identifier assigned to each Network Interface Card (NIC). It works at the Data Link Layer of the OSI model and ensures that each device on a local network can be uniquely identified.
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