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This book is designed for the course on Data Communication and Computer Networks offered to students taking the DOEACC's 'A' level certificate examination. The book will also be useful to the Diploma students who take a paper on Data Communications and Networks. Key features Comprehensive coverage of Communications and Transmission fundamentals. Data Link Layer covered in detail as two separate chapters. Detailed discussion on the Network Layer. The last 5 Question papers of DOEACC 'A' level examinations included at the end of the book as an appendix. Comprehensive coverage of Communications and Transmission fundamentals. Data Link Layer covered in detail. DOEACC 'A' level examination question papers included as an appendix.