Which two of the following values does STP take into consideration when it elects the root bridge? (Select two answer choices)A. The BPDU version numberB. The access layer bridge settingC. The Bridge IDD. The spanning-tree update numberE. The bridge prior

第1题：

Which two values are used by Spanning Tree Protocol to elect a root bridge?（）

• A、amount of RAM
• B、bridge priority
• C、IOS version
• D、IP address
• E、MAC address
• F、speed of the links

第2题：

Which statement is true about TCN propagation？（）

• A、The originator of the TCN immediately floods this information through the network.
• B、The TCN propagation is a two step process.
• C、A TCN is generated and sent to the root bridge.
• D、The root bridge must flood this information throughout the network.

第3题：

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

• A、lowest root bridge id；lowest sender bridge id；lowest port id；lowest root path cost
• B、lowest root path cost；lowest root bridge id；lowest sender bridge id；lowest sender port id
• C、lowest root bridge id；lowest sender bridge id；lowest root path cost；lowest sender port id
• D、lowest root bridge id；lowest root path cost；lowest sender bridge id；lowest sender port id

第4题：

Which two of the following values does STP take into consideration when it elects the root bridge?（）

• A、The BPDU version number
• B、The access layer bridge setting
• C、The Bridge ID
• D、The spanning-tree update number
• E、The bridge priority
• F、The VLAN number

第5题：

Examine the following options，which Spanning Tree Protocol （STP） protection mechanism disables aswitch port if the port receives a Bridge Protocol Data Unit （BPDU）？（）

• A、Uplink Fast
• B、Port Fast
• C、BPDU Guard
• D、Root Guard

第6题：

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

第7题：

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

第8题：

Which two values are used by Spanning Tree Protocol to elect a root bridge (Choose two.)（）。

• A、amount of RAM
• B、bridge priority
• C、IOS version
• D、IP address
• E、MAC address
• F、speed of the links

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第13题：

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

第14题：

Which two statements are true when the extended system ID feature is enabled？ （）

• A、The BID is made up of the bridge priority value（two bytes） and bridge MAC address （six bytes）.
• B、The BID is made up of the bridge priority （four bits）， the system ID （12 bits）， and a bridge MAC address （48 bits）.
• C、The BID is made up of the system ID （six bytes） and bridge priority value （two bytes）.
• D、The system ID value is the VLAN ID （VID）.
• E、The system ID value is a unique MAC address allocated from a pool of MAC addresses assigned to the switch or module.
• F、The system ID value is a hex number used to measure the preference of a bridge in the spanning-tree algorithm.

第15题：

Which of the following settings will reduce packet overhead and overall latency in a standalonepoint-to-point bridge deployment？（）

• A、enable concatenation on the non-root bridge only
• B、enable concatenation on the root bridge only
• C、enable concatenation on both the root bridge and non-root bridge
• D、enable concatenation on the root bridge and set it as desirable on the non-root bridge
• E、set concatenation as desirable on the root bridge and enable it on the non-root bridge

第16题：

Which statement describes a spanning-tree network that has converged?（）

• A、All switch and bridge ports are in the forwarding state.
• B、All switch and bridge ports are assigned as either root or designated ports.
• C、All switch and bridge ports are in either the forwarding or blocking state.
• D、All switch and bridge ports are either blocking or looping.

第17题：

When two bridges are competing for the root bridge of an IEEE 802.1D spanning tree and both have the same bridge priority configured， which parameter determines the winner？（）

• A、highest-numbered IP interface
• B、MAC address
• C、device uptime
• D、root port cost

第18题：

What are the switch and bridge port characteristics of a layer two spanning-tree network that is fully converged?（）

• A、All switch and bridge ports are in the forwarding state.
• B、All switch and bridge ports are in the stand-by state.
• C、All switch and bridge ports are assigned as either root or designated ports.
• D、All switch and bridge ports are in either the forwarding or blocking state.
• E、All switch and bridge are either blocking or looping.

第19题：

Which three statements about STP timers are true？（）

• A、STP timers values （hello， forward delay， max age） are included in each BPDU.
• B、A switch is not concerned about its local configuration of the STP timers values. It will only consider the value of the STP timers contained in the BPDU it is receiving.
• C、To successfully exchange BPDUs between two switches， their STP timers value （hello， forward delay， max age） must be the same.
• D、If any STP timer value （hello， forward delay， max age） needs to be changed， it should at least be changed on the root bridge and backup root bridge.
• E、On a switched network with a small network diameter， the STP hello timer can be tuned to a lower value to decrease the load on the switch CPU.
• F、The root bridge passes the timer information in BPDUs to all routers in the Layer 3 configuration.

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