December 2019
Beginner
510 pages
12h 7m
English
Content preview from Networking Fundamentals
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TTL
There is the possibility that data could be sent in a massive routing loop. For example, a router may receive some data and route it back to a router that has already seen the data, which then causes a loop. Potentially, data could be on the network forever. One of the ways this is avoided is through the use of TTL.
Every packet of data that is sent out includes a TTL value within the IP packet header. This refers to the number of hops data can go through before it is discarded. The Windows default TTL is 128 hops, though this can be adjusted by applications. To facilitate this, on receiving data, each router decrements the TTL value by 1. When a router receives some data with a TTL value of 1, it decrements it to 0 and sends an unreachable ...
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