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

第1题：

第2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3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4题：

Which two of the following statements describe a routed switch port on a multilayer switch？（）

• A、Layer 2 switching and Layer 3 routing are mutually supported.
• B、The port will not be associated with any VLAN.
• C、The routed switch port supports VLAN subinterfaces.
• D、The routed switch port is used when a switch has only one port per VLAN or subnet.
• E、The routed switch port ensures that STP remains in the forwarding state.

第5题：

A network interface port has collision detection and carrier sensing enabled on a shared twisted pair network. From this statement, what is known about the network interface port?（）

• A、This is a 10 Mb/s switch port.
• B、This is a 100 Mb/s switch port.
• C、This is an Ethernet port operating at half duplex.
• D、This is an Ethernet port operating at full duplex.
• E、This is a port on a network interface card in a PC

第6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7题：

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

• A、redundant
• B、spanned
• C、provisioned
• D、converged

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第13题：

A network interface port has collision detection and carrier sensing enabled on a shared twisted pair network. From this statement, what is known about the network interface port（）。

• A、This is a 10 Mb/s switch port
• B、This is a 100 Mb/s switch port
• C、This is an Ethernet port operating at half duplex
• D、This is an Ethernet port operating at full duplex
• E、This is a port on a network interface card in a PC

第14题：

A port in a redundant topology is currently in the blocking state and is not receiving BPDUs. To ensure that this port does not erroneously transition to the forwarding state，  which command should be configured to satisfy the requirement？（）

• A、Switch（config）#spanning-tree loopguard default
• B、Switch（config-if）#spanning-tree bdpufilter
• C、Switch（config）#udld aggressive
• D、Switch（config-if）#spanning-tree bpduguard

第15题：

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

• A、redundant
• B、spanned
• C、provisioned
• D、converged

第16题：

The network administrator has enabled BPDU guard on the LAN.  Why is an effective way to prevent an unauthorized rogue switch from altering the spanning-tree topology of this network？ （）

• A、BPDU guard can be used to prevent invalid BPDUs from propagating throughout the network. 
• B、BPDU guard can guarantee proper selection of the root bridge.
• C、BPDU guard can be utilized to prevent the switch from transmitteing BPDUs and incorrectly altering the root bridge election.
• D、BPDU guard can be utilized along with PortFast to shut down ports when a switch is connected to the port.
• E、None of the other alternatives apply

第17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18题：

What is the function of the no switchport catalyst switch interface configuration command?（）

• A、Disables the interfaces to prevent traffic flow
• B、Clears all the configurations on the interface
• C、Switches the port from access mode to trunk mode
• D、Converts the port from physical Layer 2 port to physical Layer 3 port

第19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.

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