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1
An Introduction to computer networks : / Peter L. Dordal.
Minneapolis : Open Textbook Library , 2014
745 p. : ill. ; 29 cm.
2
Applied data communications : a business-oriented approach / James E. Goldman.
New York : J. Wiley, c1998.
xiv, 663 p. : ill. ; 27 cm.
3
Business data communications : basic concepts, security, and design / Jerry FitzGerald
New York : Wiley, c1984
xx, 502 p. : ill. ; 25 cm.
4
Business data communications : introductory concepts and techniques / Gary B. Shelly, Thomas J. Cashman, Judy A. Serwatka.
Cambridge, Mass. : Course Technology, 1998.
1v. : ill. (some col.) ; 28 cm.
5
CCNA : Cisco Certified Network Associate study guide / Todd Lammle.
San Francisco, Calif. : SYBEX, 2005
xlii, 675 p. : ill. ; 23 cm.1 computer optical disc (4 3/4 in.)

A book you need to prepare for Cisco s CCNA exam, 640 801. It provides coverage of various CCNA exam objective; expanded IP addressing and subnetting coverage; detailed information on EIGRP and OSPF; and, leading edge exam preparation software.