Question: Data link protocols almost always
Data link protocols almost always put the CRC in a trailer rather than in a header. Why?
Answer to relevant QuestionsA channel has a bit rate of 4 kbps and a propagation delay of 20 msec. For what range of frame sizes does stop-and-wait give an efficiency of at least 50 percent?In protocol 6, when a data frame arrives, a check is made to see if the sequence number differs from the one expected and nonak is true. If both conditions hold, a NAK is sent. Otherwise, the auxiliary timer is started. ...Frames of 1000 bits are sent over a 1-Mbps channel using a geostationary satellite whose propagation time from the earth is 270 msec. Acknowledgements are always piggybacked onto data frames. The headers are very short. ...What is the minimum overhead to send an IP packet using PPP? Count only the overhead introduced by PPP itself, not the IP header overhead.A LAN uses Mok and Ward's version of binary countdown. At a certain instant, the ten stations have the virtual station numbers 8, 2, 4, 5, 1, 7, 3, 6, 9, and 0. The next three stations to send are 4, 3, and 9, in that order. ...
Post your question