What value is primarily used to determine which port becomes the root port on each nonroot switch in a spanning-tree topology?A. path costB. lowest port MAC addressC. VTP revision numberD. highest port priority numberE. port priority number and MAC addres

第1题：

What value is primarily used to determine which port becomes the root port on each nonroot switch in a spanning-treetopology?（）

• A、lowest port MAC address
• B、port priority number and MAC address.
• C、VTP revision number
• D、highest port priority number.
• E、pathcost

第2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3题：

What value is primarily used to determine which port becomes the root port on each nonroot switch in aspanning-tree topology？（）

• A、lowest port MAC address
• B、port priority number and MAC address.
• C、VTP revision number
• D、highest port priority number.
• E、path cost

第4题：

Each port that is configured to use LACP has an LACP port priority. Which statements are true about LACP port priority？ （）

• A、 Port priority value can be configured between 1 and 65535.
• B、 A higher port priority value means a higher priority of LACP.
• C、 Port priority can be configured so that specific links can be chosen as active links rather than the hot standby links within the port channel.
• D、 LACP uses the port priority with the port number to form the port identifier.
• E、 LACP Port priority default value should always be changed

第5题：

What value is primarily used to determine which port becomes the root port on each nonroot switch in a spanning-tree topology?（）

• A、lowest port MAC address
• B、port priority number and MAC address.
• C、VTP revision number
• D、highest port priority number.
• E、path cost

第6题：

When you enable port security on an interface that is also configured with a voice VLAN，  what is the maximum number of secure MAC addresses that should be set on the port？（）

• A、No more than one secure MAC address should be set.
• B、The default will be set.
• C、The IP phone should use a dedicated port， therefore only one MAC address is needed per port.
• D、No value is needed if the switchport priority extend command is configured. 
• E、No more than two secure MAC addresses should be set.

第7题：

A network administrator must configure 200 switch ports to accept traffic from only the currently attached host devices. What would be the most efficient way to configure MAC-level security on all these ports?（）

• A、Visually verify the MAC addresses and then telnet to the switches to enter the switchport-port security mac-address command
• B、Have end users e-mail their MAC addresses. Telnet to the switch to enter the switchport-port security mac-address command
• C、Use the switchport port-security MAC address sticky command on all the switch ports that have end devices connected to them
• D、Use show mac-address-table to determine the addresses that are associated with each port and then enter the commands on each switch for MAC address port-security

第8题：

第9题：

第10题：

第11题：

第12题：

第13题：

The classic Spanning Tree Protocol （802.1 D 1998） uses which sequence of variables to determine thebest 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） lowest 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14题：

What value is primarily used to determine which port becomes the root port on each non root switch in a spanning-tree topology?（）

• A、path cost
• B、lowest port MAC address
• C、VTP revision number
• D、highest port priority number
• E、port priority number and MAC address

第15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16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17题：

While deploying a new switch， you accidently connect ports 3/12 and 3/18 together， creating a loop. STP detected it and placed port 3/18 in blocking mode. Why did STP not place port 3/12 in blocking mode instead？ （）

• A、 Port 3/12 was already up and forwarding before the loop was created.
• B、 Port priority is based on lowest priority and lowest port number.
• C、 You connected the wire on port 3/18 last.
• D、 None of the above， it is purely random.

第18题：

Which statement is correct about RSTP port roles？（）

• A、The designated port is the switch port on every nonroot bridge that is the chosen path to theroot bridge. There can be only one designated port on every switch. The designated portassumes the forwarding state in a stable active topology. All switches connected to a given segment listen to all BPDUs and determine the switch that will be the root switch for a particular segment.
• B、The disabled port is an additional switch port on the designated switch with a redundant link to the segment for which the switch is designated. A disabled port has a higher port ID than the disabled port on the designated switch. The disabled port assumes the discarding state in astable active topology.
• C、The backup port is a switch port that offers an alternate path toward the root bridge. The backup port assumes a discarding state in a stable， active topology. The backup port will be present on nondesignated switches and will make a transition to a designated port if the current designated path fails.
• D、The root port is the switch port on every nonroot bridge that is the chosen path to the root bridge. There can be only one root port on every switch. The root port assumes the forwarding state in a stable active topology.

第19题：

第20题：

第21题：

第22题：

第23题：