Index Introduction2Designing Widget Worlds Networks3LAN Technologies for Widget World3WAN Design for Widget World4WAN Technologies4Utilizing Remote Connection Design5Determining Widget Worlds Network Internetworking Requirements5The Design Problem Optimizing Availability and Cost5Assessing User Requirements6Assessing Proprietary and Nonproprietary Solutions7Assessing Costs8Estimating Traffic Work Load Modeling9Sensitivity Testing9Why Use a Hierarchical Model9Ciscos Hierarchical Design Model10Ciscos Enterprise Composite Network Model10Campus Topology Design10Enterprise Campus Modules10A Simple Campus Redundant Design11Bridges and Switches use Spanning-Tree Protocol (STP) to Avoid Loops11Bridges (Switches) Running STP11Elect a Root12Workstation-to-Router Communication12HSRP12Security Control Characteristics12Managing E-Mail Security13Hardware Software for Network Security13Backup Design for Widget Worlds Network 14Disaster Avoidance Plan for Widget Worlds Network14Disaster Recovery Plan for Widget Worlds Network14Avoiding Unnecessary Backups 15Choosing an Appropriate Time for Backup 16References16 Introduction Internetworking is the communication between two or more networks encompasses every aspect of connecting computers together. Internetworks have grown to support vastly disparate end-system communication requirements. An internetwork requires many protocols and features to permit scalability and manageability without constant manual intervention. Widget Worlds Network can consist of the following three distinct components Campus networks i.e. a Central Office complex in Missouri, a New Mexico Plant and a California plant, which consist of locally connected users in a building or group of buildings Wide-area networks (WANs), which connect sites together