The field used in a protocol (such as DNS or ICMP) to indicate how many more network hops are allowed before the packet is dropped (discarded) (and, in terms of a TCP protocol as opposed to a UDP protocol) an error returned to the sender.
In general packet switching, a field that should be defined in the packet header used for switching (usually Layer 3, but possibly Layer 2), such that any unassured (or unreliable) network switching service is protected against the consequences of a route loop. Specifically in the Internet Protocol, a field processed by each IP router to prevent route loops. A "U" is a Unit of Measurement for Co-Location. 1U = 1.75" of Vertical Rack Space 2U = 3.5" of Vertical Rack Space 3U = 5.25" of Vertical Rack Space 4U = 7.00" of Vertical Rack Space
A timer value included in packets sent over TCP/IP-based networks that tells the recipients how long to hold or use the packet or any of its included data before expiring and discarding the packet or data. 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: DNS Server; Domain Name System (DNS); packet; resource record (RR); Transmission Control Protocol/Internet Protocol (TCP/IP); zone
A field in the IP header which indicates how long this packetshould be allowed to survive before being discarded. It isprimarily used as a hop count. See also: Internet Protocol.[Source: MALAMUD] TITLE (of a document)
Time to live (sometimes abbreviated TTL) is a limit on the period of time or number of iterations or transmissions in computer and computer network technology that a unit of data (e.g. a record) can experience before it should be discarded.
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