Clark, David,  1960- <br/><br/>
IT manager's guide to virtual private networks / 
David Leon Clark. 
 - New York :  McGraw-Hill,  1999. 
 - xxvii, 323 p. :  ill.  24 cm. 
<br/><br/> Includes index. 
<br/><br/><label>ISBN: </label>0071352023  RM221.10 
<br/><br/><label>LCCN: </label>99-035354 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Extranets (Computer networks)--Security measures.<br/>Business enterprises--Computer networks--Security measures.<br/>Internet--Security measures.<br/>Computer network protocols.