INTRODUCTION
OVERVIEW OF THE INTERNET
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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time to live
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tunnel transport link
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transport traffic link
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time to link
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Detailed explanation-1: -Time-to-live (TTL) is a value for the period of time that a packet, or data, should exist on a computer or network before being discarded.
Detailed explanation-2: -What is time-to-live (TTL) in networking? 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.
Detailed explanation-3: -A recommended initial value is 64. The time-to-live value can be thought of as an upper bound on the time that an IP datagram can exist in an Internet system. The TTL field is set by the sender of the datagram, and reduced by every router on the route to its destination.
Detailed explanation-4: -With a TTL of 3600 seconds, or 1 hour, that means that as a recursive server learns about example.com, it will store that information about the A-record at example.com for one hour.