October 2002
Intermediate to advanced
344 pages
10h 17m
English
Content preview from The ABCs of TCP/IP, 2nd Edition
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48
The ABCs of TCP/IP
As indicated in the lower portion of Exhibit 3, there are six settings defined
for the Type of Service sub-field. To understand how this sub-field is used,
assume an application is transmitting digitized voice that requires minimal
routing delays due to the effect of latency on the reconstruction of digitized
voice. By setting the Type of Service sub-field to a value of 1000, this would
indicate to each router in the path between source and destination network
that the datagram is delay sensitive and its processing by the router should
minimize delay.
In comparison, because routers are designed to discard packets under
periods of congestion, an application in which the ability of packets to reach
their destination is of primary importance ...
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