Books like Data Communications and Networking
Behrouz A. Forouzan
Data Communications and Networking is 1,264 pages, about 23 hours 10 minutes at 250 words a minute.
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How long each takes
Data Communications, Computer Networks, and Open Systems 14.2 h 
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Data and Computer Communications 14.9 h 
Internetworking with TCP/IP 9.5 h 
Data Communications and Computer Networks 9.2 h 
Fiber Optic Communications 6.2 h Bar height shows length. Estimated at 250 words a minute.