Computer networks and security / 
3G E-Learning 
 - New York :  3G E-learning LLC,  2020. 
 - xiv, 325 p.: col. Ill.; 25.5 cm. 
<br/><br/>Includes index 
<br/><br/><label>ISBN: </label>9781984638496 
<br/><br/><label>Dewey Class. No.: </label>C 621.39 C738 2020