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Data and Computer Communications is a comprehensive book for undergraduate students of computer science. The book comprises of chapters on data communications, data networking and the internet, protocol architecture, transmission media, digital data communications techniques, cellular wireless networks, and wireless LANs. In addition, the book consists of several solved and unsolved questions for thorough revision and final practice. This book is essential for undergraduate students of computer science engineering. About William Stallings William Stalling is an American academic author and educationist. He has written several textbooks on computer science topics like operating system and computer organization. He has authored several books including Cryptography and Network Security: Principles and Practice, Local and Metropolitan Area Networks and Network Security Essentials: Applications and Standards. •