Computer Knowledge
Computer Networks
2,256 Questions
Computer networks form the backbone of digital communication, connecting multiple devices to share data and resources. This area covers network architectures, transmission media, modems, and topologies like LAN. These concepts are crucial for computer knowledge sections in banking and government exams.
Network topologiesModulation and demodulationNetwork addressingFiber optic cablesWireless infrastructure
Computer Networks Questions
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2, 000 bits
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1 bits
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20, 000 bits
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none of these
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2, 113, 658
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16, 382
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126
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128
A
Correct answer
Explanation
Class A: 2^7 - 2 = 126 IDs (first and last reserved), Class B: 2^14 - 16 = 16,382 IDs, Class C: 2^21 - 256 = 2,097,088 IDs. However, the question asks how many CAN exist - all classes combined: 126 + 16,382 + 2,097,088 = 2,113,596.
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ring network
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start network
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mesh network
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bus based network
A
Correct answer
Explanation
FDDI (Fiber Distributed Data Interface) is a token-passing ring network standard operating at 100 Mbps over fiber optic cable. Its dual-ring architecture provides redundancy and high reliability for campus backbones.
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telephone lines
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microwaves
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satellites
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all of the above
D
Correct answer
Explanation
Wide Area Networks operate over long distances using various transmission media. Telephone lines (leased lines), microwave links, and satellite communications are all common WAN backbone technologies.
A
Correct answer
Explanation
In Ethernet LAN using CSMA/CD protocol, only one pair of stations can transmit data at any given time to avoid collisions. When one station is transmitting, all others must listen.
B
Correct answer
Explanation
WAN connects devices over large geographical areas using communication satellites and telephone lines. Unlike LAN which covers small areas, WAN spans countries or continents.
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Remote Communication Network (RCN)
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Local Area Network (LAN)
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Wide Area Network (WAN)
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Value Added Network (VAN)
B
Correct answer
Explanation
LAN connects computers within a small geographical area like a building or campus without using telephone lines. It's designed for local resource sharing.
C
Correct answer
Explanation
LANs enable microcomputer users in a local area to share resources like data, software, and hardware devices. This is the primary purpose of local area networking.
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A simplex mode
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A half-duplex mode
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A full-duplex mode
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An asynchronous mode
B
Correct answer
Explanation
Half-duplex mode allows data transmission in both directions, but not at the same time. Devices take turns transmitting and receiving, like walkie-talkies.
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serial
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parallel
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series parallel
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direct
A
Correct answer
Explanation
Computer communication predominantly uses serial transmission because it's more cost-effective over long distances and avoids synchronization issues that parallel transmission faces.
B
Correct answer
Explanation
DDS (Digital Data Service) provides digital communication, while DDD and WATS are analog telephone services. DDT is not a communication service at all.
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Computer
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Modem
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Printer
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Cable
B
Correct answer
Explanation
Modems are used to connect to wide area networks (WAN) or the internet through telephone lines, not for local area networks. LANs connect devices like computers, printers, and cables within a limited physical area like a building or campus.
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Wireless Area Network
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Wide Area Network
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Wide Area Net
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Wap Area Network
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None of these
B
Correct answer
Explanation
WAN is a computer network that spans a relatively large geographical area.
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It is self-replicating.
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It has zero population growth.
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It does not rely on other executable codes.
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It can affect the entire network of the system.
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Worm has no parasite.
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Slowing down of the system
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Problem in shut down or restart
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lot of pop-up ads
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Unusable web pages
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DOS attack