Network Access Restrictions White Paper, NAR White Paper, Cisco Systems, page 2, http://www.cisco.com/en/US/products/sw/secursw/ps2086/products_white_paper09186a00801a8fd0.shtml
Network Access Restrictions White Paper, NAR White Paper, Cisco Systems, page 1, http://www.cisco.com/en/US/products/sw/secursw/ps2086/products_white_paper09186a00801a8fd0.shtml
