01-08-2012, 02:15 AM
An IPsec tunnel is use to encrypt 'interesting' traffic. Here's an example that shows a tunnel that encrypts ICMP(ping) traffic.
http://www.netdogo.com/cisco-vpn-tunnel-...ec-tunnel/
The interesting traffic is defined by an access list. You can specify your normal ACL stuff like host/destination IP's, ports, TCP or UDP traffic, etc.
But that's way off topic for the CCNA, it's just looking for an overview of network security as it applies to Cisco devices.
http://www.netdogo.com/cisco-vpn-tunnel-...ec-tunnel/
The interesting traffic is defined by an access list. You can specify your normal ACL stuff like host/destination IP's, ports, TCP or UDP traffic, etc.
But that's way off topic for the CCNA, it's just looking for an overview of network security as it applies to Cisco devices.