December 2005
Intermediate to advanced
1032 pages
29h 12m
English
Content preview from The Complete Cisco VPN Configuration Guide
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Traffic Issues
VPNs were developed initially to deal with security issues of transmitting clear text data across a network. Clear text data is information that can examined and understood by any person, including the source, destination, and anyone in between. Examples of applications that send traffic in a clear text format are Telnet, file transfers via FTP or TFTP, e-mail using the Post Office Protocol (POP) or Simple Mail Transfer Protocol (SMTP), and many others. Unethical individuals, such as hackers, can take advantage of applications that send clear text data to execute the following types of attacks:
Eavesdropping
Masquerading
Man-in-the-middle
Each type of attack exposes your data and company assets to various risks. The following three ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.