Security is the important topic in new CCNA exam because Cisco routers and switches forming the backbone to today's network infrastructures, it becomes especially important to keep security in mind. Should your backbone be breached, the entire network could be crippled, sensitive information could be eavesdropped on, and data could be corrupted or altered in a way that could have drastic effects on your operations. For this reason, Cisco expects you to have a general understanding of network security.

In section we would cover following topics

• Describing the increase in security threats and the need for a security policy
• Explaining general methods to mitigate threats
• Describing the functions of common security appliances/applications
• Describing the recommended practices of securing network devices