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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 → Introduction to Computer Networks 39

What is dynamic secrets in Vault
Short-lived automatically rotated credentials generated on demand
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What is certificate lifecycle management
Automated issuance renewal and revocation of certificates
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What is ACME protocol
Automated Certificate Management Environment (Let''s Encrypt)
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What is Let''s Encrypt
Free automated open CA providing TLS certificates
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What is PKI hierarchy depth
Root CA - Intermediate CA - End-entity certificates
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What is offline root CA benefit
Reducing exposure of root private key by keeping it offline
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What is HSM (Hardware Security Module)
Tamper-resistant hardware for cryptographic key protection
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What is key ceremony
Formal process for generating root CA keys with witnesses
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What is certificate revocation reason code
Reason for revocation like key compromise or CA compromise
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What is PKCS#12 file
Container format with certificate and private key
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What is DER format
Binary encoded certificate format
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What is CSR (Certificate Signing Request)
Request sent to CA containing public key and identity info
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What is wildcard certificate
Certificate covering all subdomains of a domain
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What is SAN certificate (Subject Alternative Name)
Certificate covering multiple domain names
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What is code signing certificate
Certificate verifying software came from known publisher
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What is email signing certificate (S/MIME)
Certificate for signing and encrypting email messages
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What is IoT device certificate
Certificate for device authentication and secure communication
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What is certificate transparency requirement
All publicly trusted TLS certs must be logged in CT logs
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What is SCT (Signed Certificate Timestamp)
Proof certificate was submitted to CT log
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What is Chrome CT policy
Requiring certificates to have valid SCTs for trust
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What is DANE record in DNS
TLSA record specifying certificate or CA for domain
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What is SSHFP DNS record
SSH fingerprint record for verifying SSH host keys via DNS
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What is BGP security best practice summary
RPKI prefix filtering IRR peering authentication and monitoring
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What is a network engineer key skill
Designing implementing troubleshooting and securing networks
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What is Cisco CCNA certification
Entry-level network associate certification by Cisco
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What is Cisco CCNP certification
Professional level Cisco networking certification
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What is Cisco CCIE certification
Expert level Cisco certification (lab exam required)
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What is CompTIA Network+ purpose
Vendor-neutral entry networking certification
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What is AWS Certified Solutions Architect
AWS cloud architecture certification
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What is GCP Professional Cloud Network Engineer
Google Cloud networking specialization certification
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What is Juniper JNCIA certification
Juniper Networks Certified Internet Associate
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What is Linux LPIC certification
Linux Professional Institute Certification
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What is CISSP certification focus
Certified Information Systems Security Professional
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What is OSCP certification
Offensive Security Certified Professional - hands-on pen test cert
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What is CEH certification
Certified Ethical Hacker certification
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What is CISM certification
Certified Information Security Manager
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What is CISA certification
Certified Information Systems Auditor
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What is SANS GIAC certifications focus
Technical security certifications in various specializations
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What is the role of RFC in networking
Defining and documenting internet standards and protocols
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Computer Networks → Presentation Layer 1

What is mTLS certificate requirements
Both client and server present certificates for mutual auth
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