Mac address for internet3/16/2023 ![]() Duplicate MAC addresses will not trigger any sort of security problem in an unmanaged switch (a switch without configuration software), or a managed switch (like most Cisco/HP/Junipers) that has not been configured for port security. The reachability of either host will flap on and off and be inconsistent.Ģ) Short answer: no. So if there are two hosts, both with the same MAC address, then the switch will update it's MAC table every time it receives a frame from either host. Upon receiving any frame, the source MAC is read and compared with the current switching table, and then added alongside whichever switchport it was received on. ![]() It bases this table on the source address of frames it receives during the normal operation of the network. So,ġ) In general, an Ethernet switch keeps a table of which MAC addresses are attached to which ports. It's possible for two hosts to have the same MAC, due to spoofing, a mistake during manufacturing, or willful negligence on the part of the manufacturer.
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