CCNA Cisco Certified Network Associate Study Guide - FTP Server

Answers to Review Questions
Answers to Review Questions 97
1. B. Store-and-forward LAN switching checks every frame for CRC
errors. It has the highest latency of any LAN switch type.
2. A. The cut-through method does no error checking and has the lowest
latency of the three LAN switch types. Cut-through only checks the
hardware destination address before forwarding the frame.
3. A, C. BPDUs are still received on a blocked port, but no forwarding of
frames and BPDUs is allowed.
4. A, B. Layer-2 switching uses ASICs to provide frame filtering and is
considered hardware based. Layer-2 switching also provides wirespeed
frame transfers, with low latency.
5. A, C. Layer-2 devices running STP use the priority and MAC address
to determine the root bridge in a network.
6. B. For switches to determine the designated ports, the cost of the links
attached to each switch is used.
7. A, E, F, H. The four states are blocking, learning, listening, and
forwarding.
8. A, C, E. Layer-2 features include address learning, forwarding and filtering
of the network, and loop avoidance.
9. B. Bridge Protocol Data Units are used to send configuration messages
to neighboring switches, including the bridge IDs.
10. C. A blocked port will always listen for BPDUs to make sure that
when the port is put into forwarding state a loop will not occur.
11. A, B. Unlike a bridge, a switch can have many different spanning-tree
instances per switch. Bridges can only have one per bridge.
12. C, D. Bridges are considered software based and switches are considered
hardware based.