ccna 200-301 exam materials

ccna 200-301 exam materials.Mitigating cyber attacks is the job of the cybersecurity practitioner. In this chapter, we will master the foundational theories of cybersecurity that are necessary to begin the in-depth practice of cybersecurity. This chapter is about introducing methods for mitigating cyber attacks, and the implementation of these methods is presented in the rest of this course.2 Chapter 1 The Modern Network Security Widdens Concord1.1 Basic Principles of a Secure Network1.1.1 The Evolution of Network Security1.1.L1 The Code Red Worm AttackIn July 2001, the worm "Code Red" attacked Web servers worldwide, infecting more than 350,000 hosts. The worm not only disrupted access to the infected servers, but also affected the local networks hosting the servers, making those networks very slow or unstable. "The Code Red worm caused a Denial of Service (DoS) for millions of users.If the network security practitioners responsible for these Code Red-infected servers had developed and implemented security policies, security patches could have been applied in a timely manner. "The impact of the Code Red worm could have been halted early, leaving only a footnote in the history of cybersecurity.Cybersecurity is directly related to the business continuity of an organization. Cybersecurity incidents can affect e-business, lead to the loss of business data, threaten people's privacy and compromise the integrity of information. Such incidents can lead to damage to company assets, theft of intellectual property, litigation, and even threats to public safety.Maintaining a secure network ensures the safety of network users and protects business interests. Keeping a network secure requires the vigilance of an organization's cybersecurity practitioners. Network security practitioners must remain aware of new and evolving threats and attacks on the network, as well as the parts of devices and applications that are vulnerable to attack. This information is used to write, develop, and implement techniques to mitigate attacks. However, the security of the network is ultimately the responsibility of each network user. For this reason, one of the jobs of cybersecurity practitioners is to ensure that all users receive security awareness training. Maintaining a secure, protected network provides a more stable and usable work environment for everyone.1.1.1.2 Evolution of Security Threats