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Module 11 Exam

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1. STP was originally created by Radia Perlman and was later standardized by IEEE _____.

Question 1 of 25

2. Each switch usually assumes it is the spanning tree root until the BPDUs have all been exchanged between the switches.

Question 2 of 25

3. The default bridge priority of a Cisco switch is ______.

Question 3 of 25

4. All switches in the network take part in an election to decide the root of the spanning tree; this then leads to them making further decisions, such as which redundant path to block and which to open. The election is won by the switch with the highest BID.

Question 4 of 25

5. The STP root bridge will only ever have one root port.

Question 5 of 25

6. Match the STP cost of the ports with the port speed.
16 Mbps
19

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2

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62

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100

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4

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1 Gbps
19

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2

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62

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100

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4

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10 Gbps
19

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2

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62

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100

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4

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100 Mbps
19

Unselect

2

Unselect

62

Unselect

100

Unselect

4

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10 Mbps
19

Unselect

2

Unselect

62

Unselect

100

Unselect

4

Unselect

Question 6 of 25

7. STP ports can be in which five states?

Question 7 of 25

8. Match the timer to the port state.
Listening
15 seconds

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15 seconds

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20 seconds

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Learning
15 seconds

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15 seconds

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20 seconds

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Max age
15 seconds

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15 seconds

Unselect

20 seconds

Unselect

Question 8 of 25

9. The 802.1T standard introduced an extended system ID in order to conserve MAC addresses while still allowing for a unique BID. With extended system ID enabled (VLAN 10 in this example), the bridge priority is set to either ____ as a minimum or a multiple of ____.

Question 9 of 25

10. STP elections take place using the following order:
  • Lowest root path cost to the root bridge
  • Lowest sender bridge ID
  • Lowest root bridge ID
  • Lowest sender port ID

Question 10 of 25

11. The primary factor in deciding the STP root bridge is the ______ and in deciding the root ports on the non-root bridges is the _____, which is cumulative.

Question 11 of 25

12. Assuming no extra configurations, which switch will become root bridge?

figure_1.46

Question 12 of 25

13. Three timers monitor and age BPDUs:

Question 13 of 25

14. PortFast is typically enabled on an interface connected directly to a switch.

Question 14 of 25

15. STP is disabled on a port using PortFast.

Question 15 of 25

16. Th e command to configure PortFast is _________.

Question 16 of 25

17. A colleague calls you to ask how she can check if uplinkfast has been configured on the switch. What do you tell her to type?

Question 17 of 25

18. ______ works by finding an alternate path when an indirect link to the root port goes down.

Question 18 of 25

19. BackboneFast only need to be enabled on one master switch in order for this feature to work.

Question 19 of 25

20. With this feature configured, if a BPDU is received on a switch port, it will be put into an err-disabled mode and an administrator will have to bring up the port.

Question 20 of 25

21. When _____ is configured on a switch port that has been configured as PortFast, it will prevent the port from sending and receiving BPDUs on that port.

Question 21 of 25

22. Root Guard is designed to ensure that the port becomes a root port.

Question 22 of 25

23. What are the three RSTP link types?

Question 23 of 25

24. RSTP has defined which two new port roles?

Question 24 of 25

25. To configure RSTP you use which command?

Question 25 of 25

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