Held, Gilbert, <br/><br/>
Virtual private networking :  a construction, operation and utilization guide / 
Gilbert Held. 
 - Chichester ;  Hoboken, NJ :  Wiley,  c2004. 
 - xvi, 290 p. :  ill. ;  24 cm. 
<br/><br/>Introduction to Virtual Private Networking (Page-1), Understanding Authentication and Encryption (Page-23), Understanding the TCP/IP Protocol Suite (Page-53), Layer 2 Operations (Page-79), Higher Layer VPNs (Page-133), VPN Hardware and Software (Page-203), Service Provider –Based VPNs (Page-261).       
<br/><br/><label>ISBN: </label>0470854324 
<br/><br/><label>LCCN: </label>2004273037 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Extranets (Computer networks)
<br/><br/><label>Dewey Class. No.: </label>650.028,HEL