What action will occur if a switch receives a frame and does have the source MAC address in the MAC table?The switch forwards the frame to the associated port.The switch sends the frame to a connected router because the destination MAC address is not local.The switch refreshes the timer on that entry.The switch adds it to its MAC address table associated with the port number.Navigation Bar
Question
What action will occur if a switch receives a frame and does have the source MAC address in the MAC table?The switch forwards the frame to the associated port.The switch sends the frame to a connected router because the destination MAC address is not local.The switch refreshes the timer on that entry.The switch adds it to its MAC address table associated with the port number.Navigation Bar
Solution
When a switch receives a frame and the source MAC address is already in its MAC address table, the following actions occur:
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The switch refreshes the timer on the MAC address table entry. Each entry in the MAC address table has a timer associated with it to age out old entries. When the switch sees a frame from a MAC address, it resets this timer to keep the entry in the table.
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The switch checks the destination MAC address in the frame against its MAC address table. If the destination MAC address is in the table, the switch forwards the frame out the associated port. If the destination MAC address is not in the table, the switch floods the frame out all ports except the one it was received on.
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If the destination MAC address is not local (i.e., it's not in the same VLAN or subnet), the switch may send the frame to a connected router for further processing. This depends on the specific configuration of the switch and network.
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The switch does not add the source MAC address to its MAC address table associated with the port number, because it's already in the table. The switch only adds new source MAC addresses that it doesn't already know about.
Similar Questions
Refer to the exhibit. The exhibit shows a small switched network and the contents of the MAC address table of the switch. PC1 has sent a frame addressed to PC3. What will the switch do with the frame?Group of answer choicesThe switch will discard the frame.The switch will forward the frame to all ports.The switch will forward the frame only to port 2.The switch will forward the frame only to ports 1 and 3.The switch will forward the frame to all ports except port 4.
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The switch recordd the source MAC address and corresponding interface in the received data frame in the MAC address table. A. True B. False
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