NETWORK LAYER
INTRODUCTION
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Ensure packets reach destination within that time
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Discard packets that reach later than that time
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Prevent packets from looping indefinitely
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Limit the time for which a packet gets queued in intermediate routers.
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Detailed explanation-1: -TTL is a mechanism that limits the lifespan or lifetime of data in a network. Once the prescribed even count or time span has elapsed, data is discarded. TTL prevents a data packet form circulating indefinitely.
Detailed explanation-2: -How is the TTL field used to prevent indefinite looping of IP datagrams? The TTL field contains a counter value set by the source host. Each gateway that processes this datagram, decreases the TTL value by one. When the TTL value reaches zero, the datagram is discarded.
Detailed explanation-3: -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.