CCNA 3 Chapter 2 v5 Exam Answers 2016

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CCNA 3 Chapter 2 v5 Exam Answers 2016
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CCNA 3 Scaling Networks Chapter 2 v5 Exam Answers 2016


Which 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?


Rapid PVST+



Which 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.)




Rapid PVST+



Refer to the exhibit. Which protocol information is being displayed in the output?





A 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?

Link types can only be configured on access ports configured with a single VLAN.

Link types must be configured with specific port configuration commands.

Link types are determined automatically.*

Link types can only be determined if PortFast has been configured.

Which RSTP ports are connected to end devices?

root ports

designated ports

trunk ports

edge ports*

If no bridge priority is configured in PVST, which criteria is considered when electing the root bridge?

highest IP address

lowest MAC address*

lowest IP address

highest MAC address

Which port state will switch ports immediately transition to when configured for PortFast?





To 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.)

The role of the ports in all VLANs.*

The IP address of the management VLAN interface.

The number of broadcasts received on each root port.

The status of native VLAN ports.

The root bridge BID.*


Launch PT    Hide and Save PT
Open the PT Activity. Perform the tasks in the activity instructions and then answer the question.
Which switch is the root bridge?​





Fill in the blank. Do not use abbreviations.
The spanning-tree ” mode rapid-pvst ” global configuration command is used to enable Rapid PVST+.

Which STP priority configuration would ensure that a switch would always be the root switch?

spanning-tree vlan 10 root primary

spanning-tree vlan 10 priority 4096

spanning-tree vlan 10 priority 0*

spanning-tree vlan 10 priority 61440

Which nonproprietary protocol provides router redundancy for a group of routers which support IPv4 LANs?





Fill in the blank.
In FHRP operation, two or more routers are represented as a single ” virtual ” router.

Which three components are combined to form a bridge ID?

extended system ID*

MAC address*

port ID

IP address


bridge priority*

What is a characteristic of a Layer 2 loop?

A switch is continually forwarding the same unicast frame.

Broadcast frames are forwarded back to the sending switch.*

Routers continually forward packets to other routers.

The Time-to-Live attribute of a frame is set to infinity.

Which two network design features require Spanning Tree Protocol (STP) to ensure correct network operation? (Choose two.)

redundant links between Layer 2 switches*

removing single points of failure with multiple Layer 2 switches*

link-state dynamic routing that provides redundant routes

static default routes

implementing VLANs to contain broadcasts

What additional information is contained in the 12-bit extended system ID of a BPDU?

MAC address


port ID

IP address

What is an advantage of PVST+?

PVST+ optimizes performance on the network through load sharing.*

PVST+ requires fewer CPU cycles for all the switches in the network.

PVST+ reduces bandwidth consumption compared to traditional implementations of STP that use CST.

PVST+ optimizes performance on the network through autoselection of the root bridge.

What is the purpose of HSRP?

It prevents malicious hosts from connecting to trunk ports.

It enables an access port to immediately transition to the forwarding state.

It prevents a rogue switch from becoming the STP root.

It provides a continuous network connection when a router fails.*

In which two port states does a switch learn MAC addresses and process BPDUs in a PVST network? (Choose two.)






21. Match the step number to the sequence of stages that occur during the HSRP failover process.

Place the options in the following order:
The new forwarding router assumes both the IP and MAC address of the virtual router. -> Step 4
– not scored –
The standby router assumes the role of the forwarding router. -> Step 3
The forwarding router fails. -> Step 1
The standby router stops seeing hello messages from the forwarding router. -> Step 2


Refer to the exhibit. A network engineer is troubleshooting host connectivity on a LAN that uses a first hop redundancy protocol. Which IPv4 gateway address should be configured on the host?*

What is the outcome of a Layer 2 broadcast storm?

CSMA/CD will cause each host to continue transmitting frames.

ARP broadcast requests are returned to the transmitting host.

Routers will take over the forwarding of frames as switches become congested.

New traffic is discarded by the switch because it is unable to be processed.*

24. Which Cisco switch feature ensures that configured switch edge ports do not cause Layer 2 loops if a port is mistakenly connected to another switch?


extended system ID

BPDU guard*


25. What value determines the root bridge when all switches connected by trunk links have default STP configurations?

MAC address*


extended system ID

bridge priority

26. Which STP port role is adopted by a switch port if there is no other port with a lower cost to the root bridge?

root port*

disabled port


designated port

27. What could be the effect of duplicate unicast frames arriving at a destination device due to multiple active alternative physical paths?

The number of collision domains increases.

Frame collisions increase.

The number of broadcast domains increases.

Application protocols malfunction.*

28. Refer to the exhibit. A network administrator configured routers R1 and R2 as part of HSRP group 1. After the routers have been reloaded, a user on Host1 complained of lack of connectivity to the Internet The network administrator issued the show standby brief command on both routers to verify the HSRP operations. In addition, the administrator observed the ARP table on Host1. Which entry should be seen in the ARP table on Host1 in order to gain connectivity to the Internet?

the virtual IP address of the HSRP group 1 and the MAC address of R1

the IP address and the MAC address of R1

the virtual IP address of the HSRP group 1 and the MAC address of R2

the virtual IP address and the virtual MAC address for the HSRP group 1*

29. Refer to the exhibit. Which trunk link will not forward any traffic after the root bridge election process is complete?

30. Fill in the blank. Use a number.
The default hello timer value for STP BPDU frames is ___2__ seconds.

31. Fill in the blank. Do not abbreviate.
To enable Rapid PVST+ on a Cisco switch, the spanning-tree mode __rapid-pvst__ global configuration mode command is required

32. Which is the default STP operation mode on Cisco Catalyst switches?





Rapid PVST+

33. Which two concepts relate to a switch port that is intended to have only end devices attached and intended never to be used to connect to another switch? (Choose two.)


extended system ID

bridge ID

edge port*


34. Which two concepts relate to a switch port that is intended to have only end devices and never to be used to connect to another switch? (choose two)
bridge ID
extended system ID
edge port*

35. Match the spanning-tree feature with the protocol type. (Not all options are used.)

Place the options in the following order:

Cisco implementation of IEEE 802.1D ======> PVST+

Fast converging enhancement of IEEE 802.1D ======> RSTP

IEEE standard that reduces the number of STP instances ======+> MSTP

– not scored – =================> MST

Proprietary per VLAN implementation of IEEE 802.1w =====> Rapid PVST+

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