640-811 Interconnecting Cisco Networking Devices
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Note 2: 640-811 Answers are not shown in demo questions.
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Demo Question 11.
The EliteCertify switched LAN is displayed in the exhibit below: The switches are connected together as shown above, crating a loop. What is the type of loop that is caused in this setup, and what is the name of the protocol that prevents this from becoming a problem?
A. routing loops, hold down timers
B. switching loops, split horizon
C. routing loops, split horizon
D. switching loops, VTP
E. routing loops, STP
F. switching loops, STP
Display Answer
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Answer: F
Explanation: The Spanning-Tree Protocol (STP) prevents loops from being formed when switches or
bridges are interconnected via multiple paths. Spanning-Tree Protocol implements the
802.1D IEEE algorithm by exchanging BPDU messages with other switches to detect
loops, and then removes the loop by shutting down selected bridge interfaces. This
algorithm guarantees that there is one and only one active path between two network
devices.
Incorrect
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