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filter data that travels along a network

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What are the most effective ways to filter data that travels along a network (wired or wireless). IE. By MAC or IP, what are some others ways to secure data on a wired or wireless network.

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How to filter data that travels along a network

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MAC

MAC address filtering allows the switch to drop unwanted traffic. The switch will drop any traffic when it sees the specified MAC address in either the source address or destination address of the incoming packet. For example, if your network is congested because of high utilization from a MAC address, you can filter all traffic transmitted from that address and restore network flow, while you troubleshoot the problem.
The MAC address is a unique value associated with a network adapter. MAC addresses are also known as hardware addresses or physical addresses. They uniquely identify an adapter on a LAN.
MAC addresses are 12-digit hexadecimal numbers (48 bits in length). By convention, MAC addresses are usually written in one of the following two formats:
MM:MM:MM:SS:SS:SS

MM-MM-MM-SS-SS-SS
The first half of a MAC address contains the ID number of the adapter manufacturer. These IDs are ...

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