Cisco routers can block or prevent many types of attacks, such as:

  • finger
  • system status
  • ping

Unauthorized access can also be controlled by access lists, TACACS+, or RADIUS. Many IP spoofing attacks can be prevented, and access to specific hosts or networks can be controlled. Additionally, Cisco routers have a logging capability that logs network errors, giving clues as to what kinds of attacks a hacker might be attempting.