4370025
Description
Quiz by Brian Gamble, updated more than 1 year ago
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Created by Brian Gamble
almost 9 years ago
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Question 1
Question
What is Step 2 in how a LAN switch forwards a frame?
Answer
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add the source MAC address to the MAC address table, with incoming interface and VLAN ID
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determine the VLAN in which the frame should be forwarded
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choose the designated port on each LAN segment
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place each port in either forwarding or blocking state
Question 2
Question
What are the classes of problems caused by NOT using STP in Redundant
LANs? (Choose all that apply.)
Answer
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broadcast storms
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prevention of looping
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MAC table instability
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multiple frame transmission
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single frame transmission
Question 3
Question
With STP timers, if the hellos do not show up again within MaxAge time, the
switch reacts by taking steps to change the _________________________.
Answer
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forward delay
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STP topology
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hellos
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BIDs
Question 4
Question
During the root election the BID is broken down into its components. If there is
a tie with the lowest bridge ID what is next to be compared?
Answer
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the highest bridge ID
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the lowest root BID
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the lowest switch MAC address
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the highest switch MAC address
Question 5
Question
On a nonroot switch, STP places its port that has the least cost to the root,
called that switch’s _____________________________, in forwarding state.
Answer
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root cost
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root port (RP)
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designated port (DP)
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LANs port (LP)
Question 6
Question
What are the messages called that are used by switches to exchange information
with each other?
Answer
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STPs
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BIDs
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MAC addresses
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BPDU
Question 7
Question
Timer values on the root switch includes the hello time, MaxAge time and
_______________ time.
Answer
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forward delay
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blocking
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reevaluating
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switch
Question 8
Question
When a port that formerly blocked needs to transition to forwarding, the switch
first puts the port through two intermediate interface states. (choose the
correct state for each explanation)
A. Like the blocking state, the interface does not forward frames. The switch
removes old stale (unused) MAC table entries for which no frames are
received from each MAC address during this period. These stale MAC tab le
entries could be the cause of the temporary loops.
B. Interfaces in this state still do not forward frames, but the switch begins to
learn the MAC address of frames received on the interface.
Answer
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A - Learning
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A - Listening
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B - Learning
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B - Listening
Question 9
Question
The best way to lower STP’s convergence time is to avoid convergence all
together. ___________________________ provides a way to prevent STP
convergence from being needed when only a single port or cable failure
occurs.
Answer
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PortFast
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EtherChannel
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Rerouting
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Rapid Spanning Tree Protocol (RSTP)
Question 10
Question
The IEEE cost of 100 is what Ethernet speed?
Answer
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10 Mbps
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100 Mbps
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1 Gbps
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10 Gbps
Question 11
Question
What is Step 3 in the steady-state operation when nothing is currently changing
in the STP topology?
Answer
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the nonroot switches receive the hello on their root parts
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the interface is on the root switch, so it becomes the DP on that link
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Steps 1 and 2 repeat until something changes
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the root cost of 0, out all its working interfaces (those in forwarding state)
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