This document provides guidance on how to design a local area network (LAN) for a Business Ready Branch or autonomous Business Ready Office where corporate services such as voice, video, and data are converged onto a single office network. This document provides an overview of LAN architecture. Because of the numerous combinations of features, platforms, and customer requirements that make up an office design, this version of the design guide focuses on various LAN design discussions for voice and data services without making specific design recommendations. LAN Services Overview LAN services provide connectivity to end devices into the corporate network within the office. With the convergence of services onto a single network infrastructure, devices such as computers, telephones, surveillance cameras, cash registers, kiosks, and inventory scanners all require connection to the corporate network via the LAN. This assortment of devices requires simplified connectivity tailored to the demands of each device. For example, devices such as IP telephones or cameras may be powered via the LAN switch, automatically assigned an IP address, and be placed in a virtual LAN (VLAN) to securely segment them from the other devices. Wireless access points may be used to provide secure mobile access for laptop computers, scanning devices, wireless IP phones, or kiosks. These are just a few examples of the LAN services that are used in the Business Ready Branch or Office solution. In addition to providing the integrated voice, video and data services for the employees, branch offices also require guest network access, and in some cases should support demilitarized zones (DMZs). The guest access can be for partners or customers, and guest access includes both wired and wireless access. Regardless of the presence of DMZ, security in branch offices is a key element of branch LAN services. The LAN must be protected against malicious attacks, and the users accessing the corporate network must be authorized/authenticated
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