Time limit: 0
Quiz-summary
0 of 26 questions completed
Questions:
- 1
- 2
- 3
- 4
- 5
- 6
- 7
- 8
- 9
- 10
- 11
- 12
- 13
- 14
- 15
- 16
- 17
- 18
- 19
- 20
- 21
- 22
- 23
- 24
- 25
- 26
Information
Good luck!
You have already completed the quiz before. Hence you can not start it again.
Quiz is loading...
You must sign in or sign up to start the quiz.
You have to finish following quiz, to start this quiz:
Results
0 of 26 questions answered correctly
Your time:
Time has elapsed
You have reached 0 of 0 points, (0)
| Average score |
|
| Your score |
|
Categories
- Not categorized 0%
- 1
- 2
- 3
- 4
- 5
- 6
- 7
- 8
- 9
- 10
- 11
- 12
- 13
- 14
- 15
- 16
- 17
- 18
- 19
- 20
- 21
- 22
- 23
- 24
- 25
- 26
- Answered
- Review
-
Question 1 of 26
1. Question
1 pointsWhich spanning tree standard supports only one root bridge so that traffic from all VLANs flows over the same path?Correct
Incorrect
Hint
MST is the Cisco implementation of MSTP, an IEEE standard protocol that provides up to 16 instances of RSTP. PVST+ provides a separate 802.1D spanning-tree instance for each VLAN that is configured in the network. 802.1D is the original STP standard defined by the IEEE and allows for only one root bridge for all VLANs. 802.1w, or RSTP, provides faster convergence but still uses only one STP instance for all VLANs. -
Question 2 of 26
2. Question
1 pointsWhich two types of spanning tree protocols can cause suboptimal traffic flows because they assume only one spanning-tree instance for the entire bridged network? (Choose two.)Correct
Incorrect
Hint
STP and RSTP assume only one IEEE 802.1D spanning-tree instance for the entire bridged network irrespective of the number of VLANs, This can result in suboptimal traffic flow issues. PVST+ provides a separate spanning-tree instance for each VLAN configured. Rapid PVST+ provides a separate instance of 802.1w per VLAN, and MSTP maps multiple VLANs that have the same traffic flow requirements into the same spanning-tree instance but allows for more than one instance for dissimilar traffic flows. -
Question 3 of 26
3. Question
1 pointsWhich two network design features require Spanning Tree Protocol (STP) to ensure correct network operation? (Choose two.)Correct
Incorrect
Hint
Spanning Tree Protocol (STP) is required to ensure correct network operation when designing a network with multiple interconnected Layer 2 switches or using redundant links to eliminate single points of failure between Layer 2 switches. Routing is a Layer 3 function and does not relate to STP. VLANs do reduce the number of broadcast domains but relate to Layer 3 subnets, not STP. -
Question 4 of 26
4. Question
1 pointsWhich STP priority configuration would ensure that a switch would always be the root switch?Correct
Incorrect
Hint
Although the spanning-tree vlan 10 root primary command will ensure a switch will have a bridge priority value lower than other bridges introduced to the network, the spanning-tree vlan 10 priority 0 command ensures the bridge priority takes precedence over all other priorities. -
Question 5 of 26
5. Question
1 pointsFill in the blank. Do not use abbreviations.- The spanning-tree (mode rapid-pvst) global configuration command is used to enable Rapid PVST+.
Correct
Incorrect
-
Question 6 of 26
6. Question
1 pointsWhat port type is used to interconnect switches in a switch stack?Correct
Incorrect
Hint
Switches configured to operate in a switch stack are connected together through StackWise ports. -
Question 7 of 26
7. Question
1 pointsWhat is the purpose of the Spanning Tree Protocol (STP)?Correct
Incorrect
Hint
The Spanning-Tree Protocol (STP) creates one path through a switch network in order to prevent Layer 2 loops. -
Question 8 of 26
8. Question
1 pointsWhat additional information is contained in the 12-bit extended system ID of a BPDU?Correct
Incorrect
Hint
The BPDU has three fields; the bridge priority, the extended system ID, and the MAC address. The extended system ID contains 12 bits that identify the VLAN ID. -
Question 9 of 26
9. Question
1 pointsRefer to the exhibit. Which trunk link will not forward any traffic after the root bridge election process is complete?Correct
Incorrect
Hint
S4 has the lowest bridge ID, thus S4 is the root bridge. Because the path cost S1-S2-S4 is lower than the path cost S1-S3-S4, path S1-S2-S4 is the preferred path for S1 to reach S4. Thus, STP will set the S1 port Fa0/1 to a blocking state, and the trunk link Trunk2 will not forward any traffic. -
Question 10 of 26
10. Question
1 pointsWhich protocol provides up to 16 instances of RSTP, combines many VLANs with the same physical and logical topology into a common RSTP instance, and provides support for PortFast, BPDU guard, BPDU filter, root guard, and loop guard?Correct
Incorrect
Hint
MST is the Cisco implementation of MSTP, an IEEE standard protocol that provides up to 16 instances of RSTP and combines many VLANs with the same physical and logical topology into a common RSTP instance. Each instance supports PortFast, BPDU guard, BPDU filter, root guard, and loop guard. STP and RSTP assume only one spanning-tree instance for the entire bridged network, regardless of the number of VLANs. PVST+ provides a separate 802.1D spanning-tree instance for each VLAN that is configured in the network. -
Question 11 of 26
11. Question
1 pointsWhich port state will switch ports immediately transition to when configured for PortFast?Correct
Incorrect
Hint
PortFast allows a switch port to bypass the listening and learning states and transition immediately to the forwarding state. -
Question 12 of 26
12. Question
1 pointsRefer to the exhibit. Which switch will be elected the root bridge and which switch will place a port in blocking mode? (Choose two.)
Correct
Incorrect
Hint
The spanning-tree root bridge election process determines which switch becomes root bridge based first on the lowest priority number and then by lowest MAC address. Because all of the switches have the same priority value, SW3 becomes the root bridge based on lowest MAC address. To determine which ports are blocking or forwarding, first determine which ports become the root port on each switch. Then determine which port becomes the designated port for each link. -
Question 13 of 26
13. Question
1 pointsWhat is an advantage of PVST+?Correct
Incorrect
Hint
PVST+ results in optimum load balancing. However, this is accomplished by manually configuring switches to be elected as root bridges for different VLANs on the network. The root bridges are not automatically selected. Furthermore, having spanning-tree instances for each VLAN actually consumes more bandwidth and it increases the CPU cycles for all the switches in the network. -
Question 14 of 26
14. Question
1 pointsTo obtain an overview of the spanning tree status of a switched network, a network engineer issues the show spanning-tree command on a switch. Which two items of information will this command display? (Choose two.)Correct
Incorrect
Hint
The show spanning-tree command will display the status of STP for all VLANs that are defined on a switch and other information including the root bridge BID. It does not show the number of broadcast packets received on the ports. The IP address of the management VLAN interface is not related to STP and is displayed by the show running-configuration command. -
Question 15 of 26
15. Question
1 pointsA network administrator is preparing the implementation of Rapid PVST+ on a production network. How are the Rapid PVST+ link types determined on the switch interfaces?Correct
Incorrect
Hint
When Rapid PVST+ is being implemented, link types are automatically determined but can be specified manually. Link types can be either point-to-point, shared, or edge. -
Question 16 of 26
16. Question
1 pointsIf no bridge priority is configured in PVST, which criteria is considered when electing the root bridge?Correct
Incorrect
Hint
Only one switch can be the root bridge for a VLAN. The root bridge is the switch with the lowest BID. The BID is determined by priority and the MAC address. If no priority is configured then all switches use the default priority and the election of the root bridge will be based on the lowest MAC address. -
Question 17 of 26
17. Question
1 pointsWhat is the outcome of a Layer 2 broadcast storm?Correct
Incorrect
Hint
When the network is saturated with broadcast traffic that is looping between switches, new traffic is discarded by each switch because it is unable to be processed. -
Question 18 of 26
18. Question
1 pointsOpen the PT Activity. Perform the tasks in the activity instructions and then answer the question. Which switch is the root bridge?Correct
Incorrect
Hint
Click on each PC. Use the Terminal application. Issue the command show spanning-tree. The switch that is the root bridge will be stated in the root bridge MAC address field. -
Question 19 of 26
19. Question
1 pointsIn which two port states does a switch learn MAC addresses and process BPDUs in a PVST network? (Choose two.)Correct
Incorrect
Hint
Switches learn MAC addresses at the learning and forwarding port states. They receive and process BPDUs at the blocking, listening, learning, and forwarding port states. -
Question 20 of 26
20. Question
1 pointsWhich Cisco switch feature ensures that configured switch edge ports do not cause Layer 2 loops if a port is mistakenly connected to another switch?Correct
Incorrect
Hint
If switch access ports are configured as edge ports using PortFast, BPDUs should never be received on those ports. Cisco switches support a feature called BPDU guard. When it is enabled, BPDU guard will put an edge port in an error-disabled state if a BPDU is received by the port. This will prevent a Layer 2 loop occurring. PVST+ is an implementation of the Spanning Tree Protocol. The extended system ID is a mechanism of including VLAN ID information in the bridge ID (BID) for each VLAN. -
Question 21 of 26
21. Question
1 pointsWhat is a characteristic of a Layer 2 loop?Correct
Incorrect
Hint
A Layer 2 loop occurs when broadcast frames are forwarded back to the sending switch via a backup link. Layer 2 frames do not have a Time-to-Live (TTL) attribute. Routers forward packets at Layer 3 (the network layer) not Layer 2. -
Question 22 of 26
22. Question
1 pointsRefer to the exhibit. What is the role of the SW3 switch?
Correct
Incorrect
Hint
Switch SW3 is the STP root as can be seen in the show spanning-tree command output. -
Question 23 of 26
23. Question
1 pointsWhich three components are combined to form a bridge ID? (Choose three.)Correct
Incorrect
Hint
The three components that are combined to form a bridge ID are bridge priority, extended system ID, and MAC address. -
Question 24 of 26
24. Question
1 pointsWhich RSTP ports are connected to end devices?Correct
Incorrect
-
Question 25 of 26
25. Question
1 pointsQuestion as presented:
Sort elements
- Rapid PVST+
- PVST+
- RSTP
- MSTP
-
Proprietary per VLAN implementation of IEEEE 802.1w
-
Cisco implementation of IEEE 802.1D
-
Fast converging enhancement of IEEE 802.1D
-
IEEE standard that reduces the number of STP instances
Correct
Incorrect
Hint
MST is the Cisco implementation of MSTP (IEEE 802.1s). -
Question 26 of 26
26. Question
1 pointsIn which two PVST+ port states are MAC addresses learned? (Choose two.)Correct
Incorrect
Hint
The two PVST+ port states during which MAC addresses are learned and populate the MAC address table are the learning and the forwarding states.
