SSC CGL Computer – Networking – Devices, Topologies & Protocols – Level 1 · Warm-up
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TCP sets up a connection and guarantees delivery; UDP just sends.
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SSC CGL Computer – Networking – Devices, Topologies & Protocols – Level 1 · Warm-up – 12 questions, subject: Computer Knowledge. Every question has the correct answer with a one-line explanation; tap "Show Answer". Free practice for TNPSC, UPSC, SSC, Bank and RRB exams – Shanmugam IAS Academy, Coimbatore.
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1.
A network that covers a whole city is called a:
Correct Answer: C [MAN]
Explanation:
MAN = Metropolitan Area Network – a city.
2.
At which OSI layer is data sent as electrical, light or radio signals (raw bits)?
Correct Answer: D [Physical]
Explanation:
Layer 1, the Physical layer, carries raw bits as signals; frames are Layer 2, packets Layer 3.
3.
Which device simply regenerates (boosts) a weak signal so that it can travel further on a cable?
Correct Answer: B [Repeater]
Explanation:
A repeater only boosts signals – Layer 1; it reads no address.
4.
How many layers does the OSI reference model have?
Correct Answer: A [7]
Explanation:
Answer: 7. OSI = 7 layers; TCP/IP = 4.
5.
Which well-known port number does DNS use?
Correct Answer: D [53]
Explanation:
DNS 53; HTTP 80; SMTP 25; HTTPS 443.
6.
An IPv4 address is how many bits long?
Correct Answer: B [32]
Explanation:
IPv4 = 32 bits; MAC = 48; IPv6 = 128.
7.
Which device converts the computer's digital signals into analog signals for a telephone line and back?
Correct Answer: C [Modem]
Explanation:
Modem = modulator–demodulator.
8.
In which topology is every device connected to one central hub or switch?
Correct Answer: A [Star]
Explanation:
Star – all cables meet at the centre.
9.
What is the full form of DNS?
Correct Answer: B [Domain Name System]
Explanation:
DNS = Domain Name System – changes names into IP addresses.
10.
Which transmission medium carries data as pulses of light?
Correct Answer: D [Optical fibre]
Explanation:
Optical fibre – light; fastest and immune to electrical interference.
11.
Which address is used by a computer to refer to itself (loopback)?
Correct Answer: C [127.0.0.1]
Explanation:
Answer: 127.0.0.1. 127.0.0.1 = localhost.
12.
Which transport protocol is connection-oriented and re-sends lost data?
Correct Answer: A [TCP]
Explanation:
TCP sets up a connection and guarantees delivery; UDP just sends.
➤ Full notes, shortcuts and every answer explained – SSC CGL 2026 Computer Knowledge book (₹149): www.shanmugamiasacademy.in/study-materials/ssc-cgl-computer-knowledge
📘 SSC CGL 2026 – Computer Knowledge (Tier II Paper I – Section III)
Here you get the answer with a one-line explanation. 672 original questions with answer key and explanations · notes, figures, shortcut keys and memory aids · practice sets + 3 Computer Knowledge mock tests
Get the book – ₹149 More quizzes
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