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ITE PC v4.0 Chapter 1
ITE PC v4.0 Chapter 1

...  Forwarded message to an Ethernet network, attaches header information to the packet, contains the source and destination MAC address  Each NIC views information to see if the destination MAC address in the frame matches the device’s physical MAC address stored in RAM  No match, the device discar ...
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...  Include design modules that can be added, upgraded, and modified, without affecting the design of the other functional areas of the network.  Create a hierarchical addressing scheme.  Use routers or multilayer switches to limit broadcasts and filter traffic. ...
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... failure. Designers must warn users of the equipment or systems if adequate protection against failure has not been included in the system design. Designers must include this Important Notice in operating procedures and system manuals. These products should not be used in non-industrial applications ...
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Virtual LAN

A virtual LAN (VLAN) is any broadcast domain that is partitioned and isolated in a computer network at the data link layer (OSI layer 2). LAN is an abbreviation of local area network.To subdivide a network into virtual LANs, one configures a network switch or router. Simpler network devices can only partition per physical port (if at all), in which case each VLAN is connected with a dedicated network cable (and VLAN connectivity is limited by the number of hardware ports available). More sophisticated devices can mark packets through tagging, so that a single interconnect (trunk) may be used to transport data for multiple VLANs. Since VLANs share bandwidth, a VLAN trunk might use link aggregation and/or quality of service prioritization to route data efficiently.VLANs allow network administrators to group hosts together even if the hosts are not on the same network switch. This can greatly simplify network design and deployment, because VLAN membership can be configured through software. Without VLANs, grouping hosts according to their resource needs necessitates the labour of relocating nodes or rewiring data links.
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