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sible by all ports (called shared-memory queuing). Each location strategy has its advan-
tages and disadvantages. Finally, some switches also have multiple queues per port, which
are needed to address QoS issues (see Chapter 5).
As for a switch’s implementation model, this refers to the manner in which switching
decisions are made. For example, a centralized switch model relies on a central forwarding
table that is accessible by all ports, whereas a distributed switching model enables ports to
maintain their own lookup tables, which are synchronized with a master address table.
57. I have heard and read about ...