Cisco Networking Simplified

Part III. Making the Network Safe

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• Security 72

• Hacking 84

• Firewall and IDS 92

• VPNs 100

• Client Authentication and Public Key Encryption 108

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The Internet has opened boundless avenues for new forms of conducting business and trade. Such business and trade does not come without its drawbacks, however. We buy books and cars and other things on the Internet, but concerns remain about the credit-card numbers, personal information, or passwords being stolen from the Internet. In addition, employees want the ability to connect back to the corporate network from anywhere at any time; but there are many instances of commerce sites ...