Which hardware device works at Layer 3 of the OSI model, tracking network path metrics to route packets across separate networks? MCQ with Answer and Explanation

Question
Which hardware device works at Layer 3 of the OSI model, tracking network path metrics to route packets across separate networks?
A. Passive Hub Array
B. Layer 3 Router
C. Layer 1 Repeater
D. Layer 2 Bridge
Answer: Option B
Solution (By JKSSB Mock Tests)
Routers operate at the Network Layer (Layer 3), managing data routing across separate subnets based on logical destination IP addresses.
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Question #1
At which layer of the OSI model does a hub operate?
A. Network layer
B. Application layer
C. Physical layer
D. Data link layer
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Correct Answer: Option C

Explanation:
A hub is a physical layer device that simply repeats signals to all ports without any intelligence.
This question belongs to: Computer Computer Networking
Question #2
Which device is responsible for modulating digital computer signals into analog waves for transmission over traditional telephone lines, and demodulating them back?
A. Bridge
B. Gateway
C. Router
D. Modem
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Correct Answer: Option D

Explanation:
A modem (Modulator-Demodulator) converts digital signals from a computer into analog signals for communication cables, and vice versa.
This question belongs to: Computer Computer Networking
Question #3
Which system assigns dynamic, temporary IP addresses automatically to client workstations whenever they connect to a local area network?
A. ARP
B. DHCP
C. NAT
D. DNS
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Correct Answer: Option B

Explanation:
DHCP (Dynamic Host Configuration Protocol) automates the allocation of IP addresses, subnet masks, and gateway pointers to connecting clients.
This question belongs to: Computer Computer Networking
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