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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 39

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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802.11g maximum speed is?
54 Mbps
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802.11n (Wi-Fi 4) maximum speed is?
Up to 600 Mbps
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802.11ac (Wi-Fi 5) operates on?
5 GHz only
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Computer forensics is used for?
Investigating digital crimes and evidence
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Chain of custody in forensics ensures?
Integrity of evidence from collection to court
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Which hashing algorithm is recommended for password storage?
bcrypt/SHA-256+salt
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Salting a password before hashing?
Prevents identical passwords from having identical hashes
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PKI stands for?
Public Key Infrastructure
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In asymmetric encryption, data encrypted with public key can only be decrypted by?
The corresponding private key
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Which standard defines digital certificates?
X.509
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Kerberos is used for?
Network authentication protocol
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LDAP stands for?
Lightweight Directory Access Protocol
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Active Directory is a service by?
Microsoft
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Which command tests DNS resolution in Windows?
nslookup
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A white hat hacker is?
Ethical hacker testing with permission
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Computer Fundamentals → Computer Security 1

Ethical hacking is also called?
Penetration testing
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