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Transistor–transistor logic (TTL) is a logic family built from bipolar junction transistors.Its name signifies that transistors perform both the logic function (the first "transistor") and the amplifying function (the second "transistor"), as opposed to resistor–transistor logic (RTL) or diode–transistor logic (DTL). Time to live (TTL) or hop limit is a mechanism that limits the lifespan or lifetime of data in a computer or network. TTL may be implemented as a counter or timestamp attached to or embedded in the data. Once the prescribed event count or timespan has elapsed, data is discarded or revalidated. Aug 19, 2009 · TTL value tells local resolving name servers how long a record should be stored locally before a new copy of the record must be retrieved from DNS. The record storage is known as the DNS cache, and the act of storing records is called caching. Looking for online definition of TTL or what TTL stands for? TTL is listed in the World's largest and most authoritative dictionary database of abbreviations and acronyms The Free Dictionary Nov 30, 2015 · Time-to-live (TTL) is a value in an Internet Protocol packet that tells a network router whether or not the packet has been in the network too long and should be discarded. In IPv6 the TTL field in each packet has been renamed the hop limit. Content Continues Below
Time to live (TTL) refers to the amount of time or “hops” that a packet is set to exist inside a network before being discarded by a router. TTL is also used in other contexts including CDN caching and DNS caching.
2016-11-17 TTL电路 - 搜狗百科
RS232电平、CMOS电平、TTL电平是什么，区别是 …
Jul 14, 2020 · DNS TTL (time to live) is a setting that tells the DNS resolver how long to cache a query before requesting a new one. The information gathered is then stored in the cache of the recursive or local resolver for the TTL before it reaches back out to collect new, updated details. Amazon DynamoDB Time to Live (TTL) allows you to define a per-item timestamp to determine when an item is no longer needed. Shortly after the date and time of the specified timestamp, DynamoDB deletes the item from your table without consuming any write throughput. DTECH USB to TTL Serial 3.3V Adapter Cable TX RX Signal 4 Pin 0.1 inch Pitch Female Socket PL2303 Prolific Chip Windows 10 8 7 XP Vista (6ft, Black) 4.4 out of 5 stars 17 $12.29 $ 12 . 29 What is a TTL file? Every day thousands of users submit information to us about which programs they use to open specific types of files. While we do not yet have a description of the TTL file format and what it is normally used for, we do know which programs are known to open these files. Shipping TTL abbreviation meaning defined here. What does TTL stand for in Shipping? Top TTL abbreviation related to Shipping: ToTaL IP Time to Live (TTL) and Hop Limit Basics Steven Iveson May 6, 2019 To ensure IP packets have a limited lifetime on the network all IP packets have an 8 bit Time to Live (IPv4) or Hop Limit (IPv6) header field and value which specifies the maximum number of layer three hops (typically routers) that can be traversed on the path to their The Flashpoint Xplor 300 Pro TTL R2 ($499) is a go-anywhere flash with automatic TTL exposure support for today's most popular camera systems, and manual operation for any model with a hot shoe