Although a redundant topology eliminates some problems, it can introduce other problems.
STP is a Layer 2 link management protocol that provides path redundancy while preventing
undesirable loops in a switched network. It is a standard protocol as de?¬?ned by IEEE
802.1D.
This section identi?¬?es the problems caused by redundant switched-network topologies and
the functionality of STP to prevent these problems.
Building a Redundant Switched Topology
One of the key characteristics of a well-built communications network is that it is resilient.
This means that the network needs to be able to handle a device or link failure. To
accomplish this, you will need to select the best interconnection technologies.
Choosing Interconnection Technologies
A number of technologies are available to interconnect devices in a switched network. The
interconnection technology that you select depends on the amount of traf?¬?c the link must
carry. You will likely use a mixture of copper and ?¬?ber-optic cabling based on distances,
noise immunity requirements, security, and other business requirements. Figure 2-14
illustrates different connectivity for network devices providing services in the enterprise.
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