Security+ Guide to Network Security Fundamentals

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5. Note that one of the most dreaded attacks is a denial of service (DoS) attack or distributed denial of service (DDoS), which attempts to prevent a system from performing its normal functions through a deliberate attempt to prevent authorized users from access to the system. 6. Describe how a SYN flood attack works and how to defend against it. 7. Define a log, which is a record of events that occur. Logs related to computer security have become particularly important. 8. Discuss the common types of hardware logs, including: a. Network intrusion detection systems (NIDS) b. Domain Name System (DNS) c. Proxy servers d. Firewalls 9. Discuss the types of items that should be examined in a firewall log: a. IP addresses that are being rejected and dropped b. Probes to ports that have no application services running on them c. Source-routed packets d. Suspicious outbound connections e. Unsuccessful logins Network Design Management 1. Explain that network separation to prevent bridging, loop protection, and VLAN management are three of the principles that should be considered in network design management. 2. Discuss the importance of using network separation to protect sensitive network resources such as human resources. 3. Use Figure 7-8 to explain a switching loop which causes a broadcast storm. 4. Explain that it is possible to segment a network by physical devices grouped into logical units through a virtual LAN (VLAN).
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Security+ Guide to Network Security Fundamentals, Fourth Edition 7-6 5. Discuss the general principles for managing VLANs. Port Security 1. Explain ports can be secured through disabling unused ports, using MAC limiting and filtering, and through IEEE 802.1x. 2. Discuss how you can help secure a network by disabling unused ports. 3. Note that MAC limiting and filtering will filter and limit the number of media access control (MAC) addresses allowed on a single port. 4. Use Table 7-5 to discuss the configuration options for MAC limiting and filtering. 5. Explain that IEEE 802.1x blocks all traffic on a port-by-port basis until the client is authenticated using credentials stored on an authentication server. Securing Network Applications 1. Explain that applications including virtualization, IP telephony, and cloud computing require special security considerations. Virtualization 1. Define virtualization, which is a means of managing and presenting computer resources by function without regard to their physical layout or location. 2. Explain that with operating system virtualization a virtual machine is simulated as a self-contained software environment by the host system (the native operating system to the hardware), but appears as a guest system (a foreign virtual operating system). 3. Discuss the security advantages to hosts running virtualization and contrast the advantages with the disadvantages.
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  • Transmission Control Protocol, File Transfer Protocol, Network Security Fundamentals, Security+ Guide

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