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Telnet
A protocol that enables an Internet user to log on to and enter commands on a remote computer linked to the Internet, as if the user were using a text-based terminal directly attached to that computer. Telnet is part of the TCP/IP suite of protocols. The term telnet also refers to the software (client or server component) that implements this protocol.See also Transmission Control Protocol/Internet Protocol (TCP/IP).
Time to Live (TTL)
For Internet Protocol (IP), a field in the IP header of an IP packet that indicates the maximum number of links over which the packet can travel before being discarded by a router.For DNS, TTL values are used in resource records within a zone to determine how long requesting clients should cache and use this information when it appears in a query response answered by a DNS server for the zone.See also Domain Name System (DNS).See also Internet Protocol (IP).See also packet.See also Transmission Control Protocol/Internet Protocol (TCP/IP).
Transmission Control Protocol/Internet Protocol (TCP/IP)
A set of networking protocols widely used on the Internet that provides communications across interconnected networks of computers with diverse hardware architectures and various operating systems. TCP/IP includes standards for how computers communicate and conventions for connecting networks and routing traffic.See also Internet Protocol (IP).
Transport Layer Security (TLS)
A standard protocol that is used to provide secure Web communications on the Internet or intranets. It enables clients to authenticate servers or, optionally, servers to authenticate clients. It also provides a secure channel by encrypting communications. TLS is the latest and a more secure version of the SSL protocol.See also authentication.
Trivial File Transfer Protocol (TFTP)
A protocol used to download the initial files needed to begin the installation process.
trust relationship
A logical relationship established between domains to allow pass-through authentication, in which a trusting domain honors the logon authentications of a trusted domain. User accounts and global groups defined in a trusted domain can be given rights and permissions in a trusting domain, even though the user accounts or groups don't exist in the trusting domain's directory.See also authentication.See also domain.See also group.See also user account.
tunnel
A logical connection over which data is encapsulated. Typically, both encapsulation and encryption are performed, and the tunnel is a private, secure link between a remote user or host and a private network.See also encryption.
two-way trust
A trust relationship between two domains in which both domains trust each other. For example, domain A trusts domain B, and domain B trusts domain A. All parent-child trusts are two-way.See also domain.See also trust relationship.
