Answers to Review Questions
179
13.
C. Switches forward all frames that have an unknown destination
address. If a device answers the frame, the switch will update the MAC
address table to reflect the location of the device.
14.
D. FragmentFree looks at the first 64 bytes of a frame to make sure
a collision has not occurred. It is sometimes referred to as modified
cut-through.
15.
D. By default, 1900 switches use the FragmentFree LAN switch type.
The 1900 can use the store-and-forward method.
16.
D. The bridge ID is sent via a multicast frame inside a BPDU update.
17.
B. Root ports are determined by using the lowest cost of a link to the
root bridge.
18.
B. Only one root bridge can be used in any network.
19.
B, C. Broadcast storms and multiple frame copies are typically found
in a network that has multiple links to remote locations without some
type of loop avoidance scheme.
20.
A. The default priorities on all switches are 32768.
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