Working at a Small-to-Medium Business or ISP CCNA ... - SCTE

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66 Working at a Small-to-Medium Business or ISP, CCNA Discovery Learning GuidePacket TracerActivityExploring Internetworking Devices (3.3.4)In this activity, you determine and install the correct modules in the 1841 ISR to provide network connectivity.In addition, you select the correct cables to connect various network devices to the 1841ISR. Use file d2-334 on the CD-ROM that accompanies this book to perform this activity usingPacket Tracer.Network Equipment UpgradesMany small networks were initially built using a low-end integrated router to connect wireless andwired users. This type of device is designed to support small networks, usually consisting of a few wiredhosts and possibly four or five wireless devices. When a small business outgrows the capabilities of itsexisting network devices, it must upgrade to more-capable devices. The devices used in this courseand book are the Cisco 1841 ISR and the Cisco 2960 switch, as shown in Figure 3-9.Figure 3-9Cisco 1841 ISR and 2960 SwitchCisco 1841 ISRCisco 2960 SwitchThe Cisco 1841 ISR is designed to be a branch office or medium-sized business router. As an entrylevelmultiservice router, it offers a number of different connectivity options. It is modular in designand can deliver multiple security services.The Cisco Catalyst 2960 series Intelligent Ethernet switches are a family of fixed-configuration,standalone devices that provide Fast Ethernet and Gigabit Ethernet connectivity to the desktop. Theseswitches can provide the high speeds and high-density switching capabilities that the smaller ISRswith integrated switching cannot. They are therefore a good option when upgrading networks builtwith either hubs or small ISR devices.The Catalyst 2960 family of switches, shown in Figure 3-10, provides entry-level, enterprise-class,fixed-configuration switching that is optimized for access layer deployments. They provide both FastEthernet and Gigabit Ethernet to the desktop and are ideal for entry-level enterprise, mid-market, andbranch-office environments. These compact switches often are deployed outside the wiring closet.
Chapter 3: Planning a Network Upgrade 67Figure 3-10Cisco Catalyst 2960 Family of SwitchesReliability and AvailabilityPurchasing network devices and the installation of cabling for a network upgrade is only the beginning.Networks must be both reliable and available. Reliability is usually achieved by adding redundantcomponents to the network, such as two routers instead of one. In this case, alternative data pathsare created, so if one router experiences problems, the data can take an alternative route to arrive atthe destination. For better reliability, all devices and connections should have complete redundancy.Unfortunately, this is extremely expensive in most environments. Therefore, the network design teammust determine the level of redundancy to incorporate to achieve the necessary reliability. Figure 3-11shows redundancy in a switched network.Figure 3-11Redundancy in a Switched NetworkA failure of any of theseswitches affects only thedirectly connected PCs.The failure of either one ofthese central switches doesnot stop network operation.
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Working at a Small-to-Medium Business or ISP CCNA ... - SCTE

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