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

Which hardware device works at Layer 3 of the OSI model, tracking network path metrics to route packets across separate networks?
A. Layer 1 Repeater
B. Layer 2 Bridge
C. Passive Hub Array
D. Layer 3 Router
Answer: Option D
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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What is a frame in networking?
A. Data unit at the application layer
B. Data unit at the data link layer
C. Data unit at the transport layer
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Correct Answer: Option B


Explanation:
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What happens on a shared Ethernet network using a Bus Topology layout if a data frame reaches either extreme physical endpoint without encountering a terminator component?
A. The signal bounces back along the cable, creating interference that corrupts ongoing network traffic.
B. The signal transforms into an analog wave profile.
C. The data frame loops back through the local host interface automatically.
D. The data frame is safely archived on the primary server.

Correct Answer: Option A


Explanation:
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Which technology translates human-readable domain names (like [www.example.com](https://www.example.com)) into machine-routable numerical IP addresses?
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