The classic Spanning Tree Protocol （802.1D  1998） uses which sequence of variables to determine the best received BPDU？（）

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  A . VLAN instance mapping and revision number B . VLAN instance mapping and member list C . VLAN instance mapping， revision number， and member list D . VLAN instance mapping， revision number， member list， and timer

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• Spanning Tree Protocol IEEE 802.1 s defines the ability to deploy which of these？（）

  A . one global STP instance for all VLANs B . one STP instance for each VLAN C . one STP instance per set of VLANs D . one STP instance per set of bridge

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  A . designated ports. B . duplex operating mode. C . fast mode ports. D . root bridge. E . root ports. F . BDPU priority.

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• Which term describes a spanning-tree network that has all switch ports in either the blocking or forwardingstate？ （）

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• At which layer of the OSI model does the Spanning Tree Protocol （STP） operate at？（）

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• Which two of these are used in the selection of a root bridge in a network utilizing Spanning Tree  Protocol IEEE 802.1D？ （）

  A . Designated Root Cost B . bridge ID priority C . max age D . bridge ID MAC address E . Designated Root Priority F . forward delay

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• The classic Spanning Tree Protocol （802.1D 1998） uses which sequence of variables to determine the best received BPDU？（）

  A .  1） lowest root bridge id，2）lowest sender bridge id，3）lowest port id，4）lowest root path cost B .  1） lowest root path cost，2）lowest root bridge id，3）lowest sender bridge id，4）lowest sender port id C .  1） lowest root bridge id，2）lowest sender bridge id，3）lowest root path cost 4）owest sender port id D .  1） lowest root bridge id，2）lowest root path cost，3）lowest sender bridge id，4）lowest sender port id

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• Which two of these are used in the selection of a root bridge in a network utilizing Spanning Tree ProtocolIEEE 802.1 D？（）

  A . Designated Root Cost B . bridge ID priority C . max age D . bridge ID MAC address E . Designated Root Priority F . forward delay

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• Spanning Tree Protocol IEEE 802.1s defines the ability to deploy which of these？ （）

  A . one global STP instance for all VLANs B . one STP instance for each VLAN C . one STP instance per set of VLANs D . one STP instance per set of bridge

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• Which of the following three port types are valid Spanning Tree port types？（Choose the best threeanswers.）（）

  A . Designated port B . Nonswitch port C . Switch port D . Nonroot port E . Nondesignated port F . Root port

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• Why would an administrator change the value of the spanning-tree priority of a switch?（）

  A . in order to optimize the path that frames take from source to destination B . to increase the priority so a designated port will become a root port C . to increase the BID, so the switch is more likely to become root bridge D . in order to allow VLANs to be sent from one switch to another across a single link E . to force a given switch to become an STP server

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• Refer to the exhibit. Based on the output of the show spanning-tree command， which statement is true？ （） https://assets.asklib.com/images/image2/2018073109395889496.jpg

  A . Switch SW1 has been configured with the spanning-tree vlan 1 root primary global configuration command. B . Switch SW1 has been configured with the spanning-tree vlan 1 root secondary global configuration command. C . Switch SW1 has been configured with the spanning-tree vlan 1 priority 24577 global configuration command. D . Switch SW1 has been configured with the spanning-tree vlan 1 hello-time 2 global configuration command. E . The root bridge has been configured with the spanning-tree vlan 1 root secondary global configuration command.

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• The Company network utilizes the Multiple-instance Spanning Tree protocol in its switched LAN.   Which three statements about the MST protocol （IEEE 802.1S） are true？ （）

  A .  To verify the MST configuration， the show pending command can be used in MST configuration  mode. B .  When RSTP and MSTP are configured； UplinkFast and BackboneFast must also be enabled. C .  All switches in the same MST region must have the same VLAN-to-instance mapping， but  different configuration revision numbers. D .  All switches in an MST region， except distribution layer switches， should have their priority  lowered from the default value 32768. E .  An MST region is a group of MST switches that appear as a single virtual bridge to adjacent  CST and MST regions. F .  Enabling MST with the "spanning-tree modemst" global configuration command also enables  RSTP.

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• Which two of these are used in the selection of a root bridge in a network utilizing Spanning Tree Protocol IEEE 802.1D？（）

  A .  Designated Root Cost B .  bridge ID priority C .  max age D .  bridge ID MAC address E .  Designated Root Priority F .  forward delay

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• Which of the following are spanning tree port states?（）

  A . Learning B . Spanning C . Listening D . Forwarding E . Initializing F . Filtering G . Permitting

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• For the following ports， which port is on every bridge in a Spanning Tree Protocol IEEE 802.1w network except the root bridge？（）

  A . root port B . backup port C . designated port D . alternate port

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• pany uses MSTP within their switched LAN.  What is the main purpose of Multiple Instance  Spanning Tree Protocol （MSTP）？（）

  A .  To enhance Spanning Tree troubleshooting on multilayer switches B .  To reduce the total number of spanning tree instances necessary for a particular topology  C .  To provide faster convergence when topology changes occur in a switched network D .  To provide protection for STP when a link is unidirectional and BPDUs are being sent but not  received E .  None of the other alternatives apply

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• The following was configured on a switch：  Switch（config） # spanning-tree portfast bpdufilter default  What is the effect of this configuration command？（）

  A . If BPDUs are received by a port configured for PortFast， they are ignored and none are sent. B . The command will enable BPDU filtering on all ports regardless of whether they are configured for BPDU filtering at the interface level. C . If BPDUs are received by a port configured for Portfast， the port will transition to forwarding state. D . If BPDUs are received by a port configured for PortFast， then PortFast is disabled and the BPDUs are processed normally. E . None of the other alternatives apply.

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• By default, which of the following factors determines the spanning-tree path cost?（）

  A . It is the individual link cost based on latency B . It is the sum of the costs based on bandwidth C . It is the total hop count D . It is dynamically determined based on load

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• Spanning Tree Protocol IEEE 802.1s defines the ability to deploy which of these？（）

  A .  one global STP instance for all VLANs B .  one STP instance for each VLAN C .  one STP instance per set of VLANs D .  one STP instance per set of bridge

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• Switch R1 has been configured with the root guard feature.  What statement is true if the spanning  tree enhancement Root Guard is enabled？ （）

  A .  If BPDUs are not received on a non-designated port， the port is moved into the STP loop- inconsistent blocked state B .  IF BPDUs are received on a PortFast enabled port， the port is disabled. C .  If superior BPDUs are received on a designated port， the interface is placed into the root- inconsistent blocked state. D .  If inferior BPDUs are received on a root port， all blocked ports become alternate paths to the  root bride.

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• Which three options are considered in the spanning-tree decision process？（）

  A . lowest root bridge ID B . lowest path cost to root bridge C . lowest sender bridge ID D . highest port ID E . highest root bridge ID F . highest path cost to root bridge

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• Which of the following specifications is a companion to the IEEE 802.1w Rapid Spanning Tree  Protocol （RSTP） algorithm， and warrants the use multiple spanning-trees？ （）

  A .  IEEE 802.1s （MST） B .  IEEE 802.1Q （CST） C .  Cisco PVST+ D .  IEEE 802.1d （STP） E .  None of the other alternatives apply

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