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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 Networks → HTTP and HTTPS 4

HTTP is a
Connectionless stateless protocol
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HTTP cookies maintain
User state across stateless HTTP requests
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HTTP 1.1 key feature over 1.0 is
Persistent connections
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HTTPS uses which port
443
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Computer Networks → Introduction to Computer Networks 34

HTTP/2 major feature is
Header compression and multiplexing
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HTTP/3 uses which transport
UDP via QUIC
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DNS resolves
Domain name to IP address
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DNS query types include
Recursive and iterative
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DNS caching purpose is
Reduce lookup time by storing recent results locally
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MX record in DNS is for
Mail Exchange - directing email to mail server
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CNAME record is
Canonical Name record - alias for another hostname
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AAAA record maps
Domain to IPv6 address
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PTR record is used for
Reverse DNS - IP to hostname
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TXT record is used for
SPF DKIM DMARC email authentication
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URL stands for
Uniform Resource Locator
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WWW stands for
World Wide Web
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RSA is
Asymmetric public key algorithm
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In RSA n equals
p*q
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RSA public key is
(n,e)
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RSA private key is
(n,d)
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RSA encryption formula is
M^e mod n
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RSA decryption formula is
C^d mod n
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RSA security is based on
Integer factorization difficulty
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AES stands for
Advanced Encryption Standard
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DES key length is
56 bits
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AES key lengths are
128 192 256 bits
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Symmetric encryption uses
Same key for encryption and decryption
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Asymmetric encryption uses
Public and private key pair
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MD5 and SHA-256 are examples of
Hash functions
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Digital signature provides
Authentication and non-repudiation
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PKI stands for
Public Key Infrastructure
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CA in PKI stands for
Certificate Authority
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SHA-256 produces digest of
256 bits
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HMAC stands for
Hash-based Message Authentication Code
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Packet filter firewall inspects
Packet headers only
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Stateful inspection firewall tracks
State of network connections
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DMZ stands for
De-Militarized Zone
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IDS stands for
Intrusion Detection System
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Computer Networks → Presentation Layer 1

SSL/TLS protocol provides security between
Transport and Application layers
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Computer Networks → Application Layer 1

Application layer firewall operates at
Application layer
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