What is the primary function of a network switch? MCQ with Answer and Explanation

Question
What is the primary function of a network switch?
A. To connect to the Internet
B. To forward frames based on MAC addresses
C. To broadcast signals
D. To route packets based on IP addresses
Answer: Option B
Solution (By JKSSB Mock Tests)
Switches forward frames at the data link layer using MAC address tables.
This question belongs to: Computer Computer Networking
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Question #1
What is the primary role of the Domain Name System (DNS) in computer networks?
A. To assign dynamic IP addresses to workstations on boot.
B. To translate human-readable domain names into machine-routable numerical IP addresses.
C. To translate private IP paths to public gateway channels.
D. To resolve hardware MAC pointers to subnet masks.
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Correct Answer: Option B

Explanation:
DNS translates alphanumeric domain names (like [www.example.com](https://www.example.com)) into the numerical IP addresses used by computers to route data.
This question belongs to: Computer Computer Networking
Question #2
Which topology requires a central controller (like a hub or switch) to manage data transmission?
A. Star
B. Ring
C. Mesh
D. Bus
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Correct Answer: Option A

Explanation:
Star topology relies on a central device to which all nodes connect.
This question belongs to: Computer Computer Networking
Question #3
Which of the following IPv4 address blocks is strictly reserved by the IETF for private local area networks and is non-routable over the public internet?
A. 192.168.0.0 /16
B. 8.8.8.0 /24
C. 224.0.0.0 /4
D. 12.0.0.0 /8
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Correct Answer: Option A

Explanation:
The 192.168.0.0 to 192.168.255.255 range is a standard private IP address block designated by RFC 1918 for internal LAN use.
This question belongs to: Computer Computer Networking
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