Security - We will get there

1. Higher security, less noise: The traffic will not deliever to your network if you have not defined that ip. No matter it's tcp/udp/icmp etc.

14:33:05.062277 arp who-has 209.*.*.50 tell 209.*.*.61
14:33:05.065794 arp who-has 209.*.*.56 tell 209.*.*.61
14:33:05.066148 arp who-has 209.*.*.59 tell 209.*.*.61
14:33:05.066506 arp who-has 209.*.*.51 tell 209.*.*.61
14:33:05.066859 arp who-has 209.*.*.53 tell 209.*.*.61
14:33:05.067207 arp who-has 209.*.*.52 tell 209.*.*.61
14:33:05.067552 arp who-has 209.*.*.54 tell 209.*.*.61
14:33:05.068195 arp who-has 209.*.*.55 tell 209.*.*.61
14:33:05.068782 arp who-has 209.*.*.57 tell 209.*.*.61

2. Help with the layered data center design approach instead of using subnets for different layers which has a router in the center of all subnets.

To be continued...