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Q. 124
Which technology do catalyst switches use to resolve topology loops and ensure data use flows properly
through a single network path?
A. Virtual LANs.
B. Frame filtering.
C. Cut through switching.
D. Spanning tree protocol.
Answer: D
Explanation: Spanning Tree protocol builds ONE path through all the nodes, and eliminates any loops.
Anything sent along the tree will not encounter any loops because the protocol will eliminate any loops.
Incorrect Answers:
A is incorrect; VLANs is not a loop resolution technology.
B is incorrect; Frame Filtering is not a loop resolution technology.
C is incorrect; Cut Through switching is not a loop resolution technology. Rather it is a form of forwarding.
Steve McQuerry. Interconnecting Cisco Network Devices. (Cisco Press: 2000) pages 155-160.
Q. 125
Which two statements are true? (Choose two)
A. Ethernet 802.3 utilizes a half duplex method for data transfer.
B. In a 100mbps point to point connect, a full duplex connection can provide 400mbs of data transfer.
C. Ethernet switches can use the full duplex mode to connect multiple nodes on a single port office
switch.
D. Full duplex Ethernet takes advantage of UTP using one pair of transmission and other pair for
reception.
Answer: A and d.
Explanation: Half duplex Ethernet is most often found in a 802.3 network and full duplex achieves data
transmission by using one pair to receive data and another to send data.
Incorrect Answers:
B is incorrect; in full duplex you can maximize up to double – by transmitting and receiving at the same time,
for a nominal maximum throughput of 200mbps.
C is incorrect; when running full duplex, only one device can be attached to the port.