1. Which network device operates at the Physical layer (Layer 1) of the OSI model?
A. Router
B. Switch
C. Hub
D. Firewall
Answer: C. Hub
Explanation: A hub works at the Physical layer (Layer 1) and simply repeats incoming signals to all connected devices without examining the data.
2. Which device is used to connect different networks and forward packets based on IP addresses?
A. Bridge
B. Switch
C. Router
D. Hub
Answer: C. Router
Explanation: A router operates at the Network layer (Layer 3) and uses IP addresses to determine the best path for forwarding packets between networks.
3. A switch primarily operates at which OSI layer?
A. Physical Layer
B. Data Link Layer
C. Network Layer
D. Transport Layer
Answer: B. Data Link Layer
Explanation: A traditional switch operates at Layer 2 and forwards frames based on MAC addresses. Each switch port forms a separate collision domain.
4. Which device regenerates weak signals to extend the transmission distance?
A. Repeater
B. Gateway
C. Router
D. Modem
Answer: A. Repeater
Explanation: A repeater receives weakened signals, regenerates them, and retransmits them to increase the communication distance.
5. Which device translates data between different network protocols or architectures?
A. Bridge
B. Gateway
C. Hub
D. Switch
Answer: B. Gateway
Explanation: A gateway acts as a protocol converter, enabling communication between networks using different protocols or architectures.
6. Which device divides a collision domain but not a broadcast domain?
A. Router
B. Hub
C. Bridge
D. Firewall
Answer: C. Bridge
Explanation: A bridge segments a network into multiple collision domains but forwards broadcast traffic, so the broadcast domain remains unchanged.
7. Which device converts digital signals into analog signals and vice versa?
A. Switch
B. Router
C. Modem
D. Repeater
Answer: C. Modem
Explanation: A modem (Modulator-Demodulator) converts digital data from a computer into analog signals for transmission and converts received analog signals back into digital form.
8. Which device filters frames based on MAC addresses?
A. Router
B. Hub
C. Switch
D. Modem
Answer: C. Switch
Explanation: A switch learns MAC addresses and forwards frames only to the port associated with the destination device, improving network efficiency.
9. Which device is used to provide wireless connectivity to users?
A. Access Point
B. Hub
C. Repeater
D. Bridge
Answer: A. Access Point
Explanation: An Access Point (AP) enables wireless devices to connect to a wired LAN through Wi-Fi communication.
10. Which device separates broadcast domains?
A. Switch
B. Bridge
C. Router
D. Repeater
Answer: C. Router
Explanation: Routers do not forward broadcast packets by default, making each interface a separate broadcast domain.
11. Which device broadcasts incoming data to all connected ports?
A. Switch
B. Router
C. Hub
D. Gateway
Answer: C. Hub
Explanation: A hub does not maintain a MAC address table. Therefore, it sends incoming data to every connected device.
12. Which network device creates a separate collision domain for each port?
A. Hub
B. Switch
C. Repeater
D. Modem
Answer: B. Switch
Explanation: Every switch port represents an independent collision domain, which reduces collisions and increases performance.
13. Which device is primarily used to secure a network from unauthorized access?
A. Firewall
B. Bridge
C. Repeater
D. Hub
Answer: A. Firewall
Explanation: A firewall monitors and filters incoming and outgoing traffic according to predefined security rules to prevent unauthorized access.
14. Which device amplifies signals without examining the content of the data?
A. Router
B. Repeater
C. Gateway
D. Switch
Answer: B. Repeater
Explanation: A repeater works at Layer 1 and simply regenerates electrical or optical signals without interpreting them.
15. Which network device connects a local network to an Internet Service Provider (ISP)?
A. Modem
B. Hub
C. Bridge
D. Repeater
Answer: A. Modem
Explanation: A modem establishes communication between a user’s network and the ISP by converting signals into a suitable format for transmission.