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CCNA Routing and Switching Deluxe Study Guide: Exams 100-101, 200-101, and 200-120 by William Tedder, Todd Lammle

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images By default, the Cisco IOS runs some services that are unnecessary to its normal operation, and if you don't disable them, they can be easy targets for denial-of-service (DoS) attacks and break-in attempts.

DoS attacks are the most common attacks because they are the easiest to perform. Using software and/or hardware tools such as an intrusion detection system (IDS) and intrusion prevention system (IPS) can both warn and stop these simple, but harmful, attacks. However, if we can't implement IDS/IPS, there are some basic commands we can use on our ...

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