Ping
A tool checking ICMP replies and packet round-trip time. No reply may result from filtering; successful ping does not prove a website works.
Definition and sourcesKNOWLEDGE / FROM A TO Z
Glossary
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Terms 35 / 685
Clear filtersPrivate browsing
A mode limiting retained browsing history and session data after windows close. It does not automatically hide activity from websites, employers or internet providers.
Definition and sourcesQUIC
A UDP-based transport with secure connection establishment and multiple streams. It underpins HTTP/3; using UDP does not mean lacking reliability.
Definition and sourcesSender Policy Framework
A DNS policy authorising sending sources for the envelope-sender domain. It neither signs content nor alone authenticates the visible From field.
Definition and sourcesSMTP TLS reporting
A mechanism reporting secure-email-transport problems. It supports policy monitoring but does not itself enforce encryption or delivery.
Definition and sourcesSSL and TLS
A historical family of secure-transport protocols superseded by TLS. SSL certificate remains colloquial terminology; obsolete SSL versions should not be enabled.
Definition and sourcesTraceroute
A tool showing responding hops along a packet route. Asterisks may mean filtering; the reverse path need not be identical.
Definition and sourcesTransport Layer Security
A protocol protecting communication through encryption and endpoint authentication. It needs current versions and certificate checks and does not certify website honesty.
Definition and sourcesUser-Agent
A header describing the client's declared software, such as a browser or crawler. It can be spoofed and should not be sole identity proof.
Definition and sourcesVPN (Virtual Private Network)
A virtual private network connecting devices or networks through other infrastructure. Common implementations encrypt traffic to the VPN endpoint. It provides neither complete anonymity nor phishing protection; tunnel scope and provider trust matter.
Definition and sourcesWebmail
A browser interface for email. It is not a separate email-delivery protocol; security depends on authentication and session protection among other controls.
Definition and sources