Kerio Tech Network Monitor Instrukcja Użytkownika Pobierz pdf (Strona 68)

Chapter 9 Glossary of Terms

Proxy server An older method of Internet connection sharing. Client in a local network

does not communicate directly with the target computer in the Internet but it passes

its request to a proxy server. The proxy server will process the request and deliver

the response.

SMTP Basic protocol used for e-mail delivery in the Internet. Sender and recipient are

identiﬁed by an e-mail address.

By default, TCP protocol and port 25 is used.

Service In network terminology, application used in an network environment is called

a service. In TCP/IP, the service is identiﬁed by a transport protocol and port (e.g.

HTTP uses TCP protocol and port 80).

SSL Protocol for secured and encrypted TCP connection. Originally, it was created to

secure the transmission of WWW pages by the HTTP protocol (this protocol is called

HTTPS). Today, almost all standard Internet services — SMTP, POP3, IMAP, LDAP, etc.

— supports SSL.

Communicatin starts by the exchange of an encryption key, which is later used for a

(symetrical) encryption of the real data.

TLS Transport Layer Security. SSL successor, de facto SSL version 4.

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Kerio Tech Network Monitor Instrukcja Użytkownika Strona 68