Leach, Donald P. <br/><br/>
Network fundamentals  CCNA exploration companion guide 
Mark A. Dye, Rick McDonald, Antoon W. Rufi. 
 - Reston, Va.  Reston Pub. Co.  c1979. 
 - xv, 431 p.  ill.  25 cm. 
<br/><br/><label>ISBN: </label>0835942775 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Electronics--Mathematics.