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Contractors refurbishing parts of the building) As a network designer it is often your responsibility to collate data on the environmental and physical attributes relevant for any network equipment. These attributes do not directly impact the modeling process but are, nevertheless, important in determining overall costs and feasibility. Given their importance we will briefly outline the key data you need to collate. Environmental data You should aim to establish the following information about all network equipment to be deployed and any already installed: 9 Heat dissipation (output in BTU/hour) per device 9 Power consumption per device, AC or DC 9 Restrictions on operating temperature and storage temperature 9 Equipment weightmold buildings may have tight limitations on load bearing 9 Vertical rack space required, per device, for standard 19-inch wide rack equipment.

9 Bridges can reconfigure around topology changes, but the process is typically much slower than for touters. 9 Different implementations of STA do not interwork and can cause stability problems. , those capable of dropping packets under load) can cause serious stability problems if STP packets are being lost. Spanning Tree configurations can also be expensive for resilient WAN configurations, and there are no standards for load sharing over multiple paths with separate bridges. 9 Transparent bridges use only a subset of network topology at any one time, since only a single path can exist at any time between two points in a bridged internetwork.

Routers can use redundant paths and determine optimal routes even in a dynamically changing network. Routers are necessary to ensure scalability as the network grows and expands. They provide the following capabilities, which are vital in network designs" 9 Broadcast and multicast control 9 Broadcast segmentation 9 Security 9 Quality of Service (QoS) 9 Multimedia support Since routers operate at Layer 3, they can enforce a hierarchical addressing structure. Therefore, a routed network can tie a logical addressing structure to a physical infrastructure~for example, through IP subnets for each segment.

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CCIE Practical Studies Labs


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