HP 635n Practical IPsec Deployment for Printing and Imaging Devices - Page 14

Switch Broadcast Behavior, Switch Unknown Destination Behavior

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Figure 11 - Switch Broadcast Behavior Here, the broadcast address is a special address that the Ethernet switch knows that it has to send out all ports. It is an address that makes the switch act like an Ethernet repeater. Another way in which the Ethernet switch will act like an Ethernet repeater is when it receives an Ethernet packet that is destined for a device which is not in its lookup table. In other words, the switch receives a packet and does not know which port the destination device resides on, the switch sends the packet out all ports or "floods" the packet, as is the common terminology. Refer to Figure 12 - Switch Unknown Destination Behavior. Figure 12 - Switch Unknown Destination Behavior This behavior is interesting. If Jane could confuse the switch so that it didn't know where any devices were located, it would constantly flood packets and act like an Ethernet repeater. How can an Ethernet switch be confused to act in this manner? Well, the Switch MAC Table is stored in memory 14

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14
Figure 11 - Switch Broadcast Behavior
Here, the broadcast address is a special address that the Ethernet switch knows that it has to send out
all ports.
It is an address that makes the switch act like an Ethernet repeater.
Another way in which
the Ethernet switch will act like an Ethernet repeater is when it receives an Ethernet packet that is
destined for a device which is not in its lookup table.
In other words, the switch receives a packet
and does not know which port the destination device resides on, the switch sends the packet out all
ports or “floods” the packet, as is the common terminology.
Refer to Figure 12 – Switch Unknown
Destination Behavior.
Figure 12 - Switch Unknown Destination Behavior
This behavior is interesting.
If Jane could confuse the switch so that it didn’t know where any devices
were located, it would constantly flood packets and act like an Ethernet repeater.
How can an
Ethernet switch be confused to act in this manner?
Well, the Switch MAC Table is stored in memory