Quick Revision

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 39

Which protocol resolves domain to IP?
DNS
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IMAP vs POP3: IMAP?
Keeps mail on server, syncs across devices
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Which protocol provides secure remote shell access?
SSH
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SFTP stands for?
Secure FTP
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VPN tunnel encrypts?
All traffic between client and VPN server
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Which OSI layer handles physical transmission?
Layer 1
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Parity check detects how many bit errors?
Single bit errors
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CRC stands for?
Cyclic Redundancy Check
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Which network device regenerates signal without processing data?
Repeater
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VLAN stands for?
Virtual Local Area Network
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QoS in networking stands for?
Quality of Service
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BGP stands for?
Border Gateway Protocol
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OSPF stands for?
Open Shortest Path First
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Token Ring uses which topology?
Ring
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CSMA/CD is used in?
Ethernet
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CSMA/CA is used in?
Wi-Fi (802.11)
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Which is NOT a network protocol?
ALU
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Packet switching sends data as?
Variable-size packets with routing info
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Circuit switching is used in?
Traditional telephone networks
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ATM in networking stands for?
Asynchronous Transfer Mode
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Which is the default subnet mask for Class A network?
255.0.0.0
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Class B IP addresses range is?
128.0.0.0 to 191.255.255.255
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Class C default subnet mask is?
255.255.255.0
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Multicast addresses belong to?
Class D
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APIPA address range is?
169.254.x.x
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Which addressing is used in IPv6 for same-network devices?
Link-local
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Which is a valid IPv6 address?
2001:db8::1
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What does '::' represent in IPv6?
Consecutive groups of all-zero octets
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CIDR stands for?
Classless Inter-Domain Routing
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A /28 subnet has how many host addresses?
14
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Proxy server acts as?
Intermediary between client and internet
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Reverse proxy is placed?
Between internet and web servers
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Content filtering by proxy is used to?
Block access to certain websites
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What is the purpose of TTL in IP packets?
Time To Leave packet on network — prevents infinite loops
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Which layer does SSL/TLS operate at?
Between Transport and Application layers
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WEP encryption for Wi-Fi is?
Deprecated — has serious security flaws
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WPA3 is the most secure Wi-Fi protocol because?
Uses SAE (Simultaneous Authentication of Equals)
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SSID is?
Service Set Identifier — Wi-Fi network name
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802.11b Wi-Fi maximum speed is?
11 Mbps
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Computer Fundamentals → Internet Basics 1

POP3 downloads email and?
Usually deletes from server
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