Brian Gamble
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Chapter 1 quiz

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Brian Gamble
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Ch 1 quiz

Question 1 of 11

1

What is Step 2 in how a LAN switch forwards a frame?

Select one of the following:

  • add the source MAC address to the MAC address table, with incoming
    interface and VLAN ID

  • determine the VLAN in which the frame should be forwarded

  • choose the designated port on each LAN segment

  • place each port in either forwarding or blocking state

Explanation

Question 2 of 11

1

What are the classes of problems caused by NOT using STP in Redundant
LANs? (Choose all that apply.)

Select one or more of the following:

  • broadcast storms

  • prevention of looping

  • MAC table instability

  • multiple frame transmission

  • single frame transmission

Explanation

Question 3 of 11

1

With STP timers, if the hellos do not show up again within MaxAge time, the
switch reacts by taking steps to change the _________________________.

Select one of the following:

  • forward delay

  • STP topology

  • hellos

  • BIDs

Explanation

Question 4 of 11

1

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?

Select one of the following:

  • the highest bridge ID

  • the lowest root BID

  • the lowest switch MAC address

  • the highest switch MAC address

Explanation

Question 5 of 11

1

On a nonroot switch, STP places its port that has the least cost to the root,
called that switch’s _____________________________, in forwarding state.

Select one of the following:

  • root cost

  • root port (RP)

  • designated port (DP)

  • LANs port (LP)

Explanation

Question 6 of 11

1

What are the messages called that are used by switches to exchange information
with each other?

Select one of the following:

  • STPs

  • BIDs

  • MAC addresses

  • BPDU

Explanation

Question 7 of 11

1

Timer values on the root switch includes the hello time, MaxAge time and
_______________ time.

Select one of the following:

  • forward delay

  • blocking

  • reevaluating

  • switch

Explanation

Question 8 of 11

1

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.

Select one or more of the following:

  • A - Learning

  • A - Listening

  • B - Learning

  • B - Listening

Explanation

Question 9 of 11

1

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.

Select one of the following:

  • PortFast

  • EtherChannel

  • Rerouting

  • Rapid Spanning Tree Protocol (RSTP)

Explanation

Question 10 of 11

1

The IEEE cost of 100 is what Ethernet speed?

Select one of the following:

  • 10 Mbps

  • 100 Mbps

  • 1 Gbps

  • 10 Gbps

Explanation

Question 11 of 11

1

What is Step 3 in the steady-state operation when nothing is currently changing
in the STP topology?

Select one of the following:

  • the nonroot switches receive the hello on their root parts

  • the interface is on the root switch, so it becomes the DP on that link

  • Steps 1 and 2 repeat until something changes

  • the root cost of 0, out all its working interfaces (those in forwarding state)

Explanation

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