TAILIEUCHUNG - CompTIA Network+ Certification Study Guide part 51

CompTIA’s Network+ certification Study Guide part 51 is a globally-recognized, vendor neutral exam that has helped over 235,000 IT professionals reach further and higher in their careers. The 2009 Network+ exam (N10-004) is a major update with more focus on security and wireless aspects of networking. Our new study guide has been updated accordingly with focus on network, systems, and WAN security and complete coverage of today’s wireless networking standards. | 486 CHAPTER 10 Network Management FIGURE A Confusing Network Diagram. Image courtesy of FIGURE A Simple Physical Network Diagram. Image courtesy of Mark R. Lindsey mark@ Configuration Management 487 FIGURE A Complex Physical Network Diagram. Image courtesy of assistance of network diagram software like Microsoft Visio SmartDraw and or AutoCAD. Many physical network diagrams as represented in Figure have the site name location type of physical media connecting each site and the speed at which the site link is running at. Physically laying out your network devices will help you conserve time and money when you finally do decide to create or troubleshoot network issues. Logical Network Diagrams Logical network diagrams depict how your network looks from a computer s point of view and not as a physical structured layout as we might see it in our server rooms. Protocols configurations IP addressing subnets access control 488 CHAPTER 10 Network Management FIGURE A Logical Network Diagram. Image courtesy of Dustin L. Fritz lists security devices firewalls virtual private networks VPNs and so on and applications are all logically associated with a computer network and are drawn into logical network diagrams. Notice Figure does not show any of the physical characteristics of Figure . In fact Figure has details such as IP addresses subnets firewalls and logical network paths in and out of different subnets which are logical. Baselines Identifying how networks operate under normal conditions might help you recognize performance collision and utilization issues when comparing your normal conditions to previous periods of operation. Over a period of time you should document the pattern of normal behavior in your environment which is called a baseline. Baselines should be tracked at particular times of day. Baselining activities may include when servers reach maximum allocation when a router and switch .

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