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What does the Spanning Tree Algorithm (STA) do?
A.) Restore lost frames
B.) Builds routing tables for routing through an internetwork
C.) Forward packets through a switch
D.) STA is implemented by STP to prevent loops
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Answer: D
IEEE 8021.d Spanning Tree Protocol (STP) was developed to
prevent
routing loops in a network. If a router, switch, or hub has
more then
one path to the same destination, a routing problem could
occur. To
prevent this, the Spanning Tree Protocol is executed between
the devices
to detect and logically block redundant paths from the
network. The main
function of the Spanning Tree Protocol is to allow redundant
network
paths without suffering the effects of loops in the network.
The Spanning Tree Algorithm (STA) implemented by STP
prevents loops by
calculating a stable Spanning Tree network topology. When
creating fault
tolerant internetworks, a loop-free path must exist between
all Ethernet
nodes in the network. Spanning Tree frames called Bridge
Protocol Data
Units (BPDUs) are sent and received by all switches in the
network at
regular intervals.
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