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GK One-Line Question & Answer

15541+ short questions with short answers, covering every category and sub-category on the site — no long articles to scroll through. Good for a fast recap before an exam, or a few minutes of daily practice.

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Computer Fundamentals → Introduction to Computer 34

A hub operates at which OSI layer?
Layer 1
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Which OSI layer is responsible for reliable data transmission?
Transport
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DNS stands for?
Domain Name System
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HTTP stands for?
HyperText Transfer Protocol
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HTTPS adds which security feature to HTTP?
Encryption (SSL/TLS)
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Which layer of OSI model manages encryption?
Presentation
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Which is the correct full form of URL?
Uniform Resource Locator
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SMTP is used for?
Sending email
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A MAC address is?
48-bit hardware identifier
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Which topology connects all devices to a central hub?
Star
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Which topology has highest fault tolerance?
Mesh
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LAN stands for?
Local Area Network
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WAN stands for?
Wide Area Network
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Which device connects two different network types?
Gateway
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Cloud computing refers to?
Delivering computing services over the internet
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SaaS stands for?
Software as a Service
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IaaS stands for?
Infrastructure as a Service
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Which type of virus attaches to executable files?
File virus
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Ransomware encrypts user files and demands?
Payment for decryption key
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SSL stands for?
Secure Socket Layer
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Encryption converts?
Plaintext to ciphertext
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Decryption converts?
Ciphertext to plaintext
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Which is a symmetric encryption algorithm?
AES
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RSA is an example of?
Asymmetric encryption
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MD5 and SHA are examples of?
Hashing algorithms
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A digital signature provides?
Authentication and non-repudiation
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Which port does HTTP use by default?
80
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Which port does HTTPS use?
443
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Port 22 is associated with which protocol?
SSH
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Which of the following is a VPN?
Virtual Private Network
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Bandwidth of a network is measured in?
bps/Mbps/Gbps
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Latency in networking refers to?
Delay in data transmission
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Which protocol provides reliable, connection-oriented service?
TCP
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UDP is preferred over TCP when?
Speed is more important than reliability
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Computer Fundamentals → Internet Basics 2

Email protocol for receiving mail is?
POP3/IMAP
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The internet is a?
WAN
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Computer Fundamentals → Computer Security 3

A firewall is used to?
Block unauthorized network access
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A Trojan horse is?
Malware disguised as legitimate software
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Phishing is?
Fraudulent attempt to obtain sensitive information
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Computer Fundamentals → Memory Units 1

A worm differs from a virus in that?
Worms self-replicate without needing host files
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