References
“Cisco Guide to Harden Cisco IOS Devices,” http://www.cisco.com/c/en/us/support/docs/ip/access-lists/13608-21.html
“Catalyst 3560 Software Configuration Guide, Release 12.2(52)SE: Configuring Private VLANs,” https://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst3560/software/release/12-2_52_se/configuration/guide/3560scg/swpvlan.html
“Cisco IOS Security Configuration Guide, Release 12.2: Configuring Unicast Reverse Path Forwarding,” https://www.cisco.com/c/en/us/td/docs/ios/12_2/security/configuration/guide/fsecur_c/scfrpf.html