Which of the following components must be elected before the Spanning Tree Protocol can converge in a switched LAN?A. Designated ports.B. Duplex operating mode.C. Fast mode ports.D. Root bridge.E. Root ports.F. BDPU priority.

题目

Which of the following components must be elected before the Spanning Tree Protocol can converge in a switched LAN?

A. Designated ports.

B. Duplex operating mode.

C. Fast mode ports.

D. Root bridge.

E. Root ports.

F. BDPU priority.

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相似问题和答案

第1题：

You want to influence the root bridge selection within the Ezonexam LAN. Which two values are used by spanning tree protocol to elect a root bridge? (Choose two.)

A. Amount of RAM

B. Speed of the links

C. IOS Version

D. MAC Address

E. Bridge Priority

F. IP Address

G. Router ID

正确答案：DE
D,E

第2题：

Refer to the exhibit. Which statement is true?()

A.The Fa0/11 role confirms that SwitchA is the root bridge for VLAN 20.

B.VLAN 20 is running the Per VLAN Spanning Tree Protocol.

C.The MAC address of the root bridge is 0017.596d.1580.

D.SwitchA is not the root bridge, because not all of the interface roles are designated.

参考答案：D

第3题：

Which three statements are true about the operation of a full-duplex Ethernet network, which is being used in the Ezonexam LAN? (Choose three)

A．Ethernet hub ports are preconfigured for full-duplex mode.

B．The host network card and the switch port must be capable of operating in full-duplex mode.

C．There are no collisions in full-duplex mode.

D．In a full-duplex environment, the host network card must check for the availability of the network media before transmitting.

E．A dedicated switch port is required for each full-duplex node.

正确答案：BCE
解析：Explanation:
Half-duplex Ethernet is defined in the original 802.3 Ethernet and Cisco says you only use one wire pair with a digital signal running in both directions on the wire. It also uses the CSMA/CD protocol to help prevent collisions and to permit retransmitting if a collision does occur. If a hub is attached to a switch, it must operate in half-duplex mode because the end stations must be able to detect collisions.

Half-duplex Ethernet-typically 10BaseT-is only about 30 to 40 percent efficient as Cisco sees it, because a large 10BaseT network will usually only give you 3- to 4Mbps-at most. Full-duplex Ethernet uses two pairs of wires, instead of one wire pair like half duplex. Also, full duplex uses a point-to-point connection between the transmitter of the transmitting device and the receiver of the receiving device, which means that with full-duplex data transfer, you get a faster data transfer compared to half duplex.

And because the transmitted data is sent on a different set of wires than the received data, no collisions occur. The reason you don't need to worry about collisions is because now Full-duplex Ethernet is like a freeway with multiple lanes instead of the single-lane road provided by half duplex. Full-duplex Ethernet is supposed to offer 100 percent efficiency in both directions; this means you can get 20Mbps with a 10Mbps Ethernet running full duplex, or 200Mbps for FastEthernet.

第4题：

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

正确答案:A,E,F

第5题：

Refer to the exhibit. Given the output shown from this Cisco Catalyst 2950, what is the most likely reason that interface FastEthernet 0／10 is not the root port for VLAN 2?()

A.This switch has more than one interface connected to the root network segment in VLAN 2.

B.This switch is running RSTP while the elected designated switch is running 802.1d Spanning Tree.

C.This switch interface has a higher path cost to the root bridge than another in the topology.

D.This switch has a lower bridge ID for VLAN 2 than the elected designated switch.

参考答案：C

第6题：

Which four Cisco Spanning Tree Protocol enhancements are supported with rapid per－VLAN Spanning－Tree plus?()

A. PortFast

B. UplinkFast

C. loop guard

D. root guard

E. BPDU guard

F. BackboneFast

参考答案：A, C, D, E

第7题：

Refer to the exhibit. Why has this switch not been elected the root bridge for VLAN1?()

A.It has more than one interface that is connected to the root network segment.

B.It is running RSTP while the elected root bridge is running 802.1d spanning tree.

C.It has a higher MAC address than the elected root bridge.

D.It has a higher bridge ID than the elected root bridge.

参考答案：D

第8题：

When is a switched network that is running the Spanning Tree Protocol considered to be fully converged?

A．when all switches have the same BID as the root switch

B．when all switches have received the MAC address of each neighboring switch

C．when every enabled switch port has been assigned a unique identifier

D．when every operating switch port is in either the blocking or forwarding state

E．when all switches are in either client, server, or transparent mode

正确答案：D
解析：Explanation:
States of the Spanning Tree Protocol:
Blocking A blocked port won't forward frames; it just listens to BPDUs. All ports are in blocking state by default when the switch is powered up. The purpose of the blocking state is to prevent the use of looped paths.

Listening The port listens to BPDUs to make sure no loops occur on the network before passing data frames. A port in listening state prepares to forward data frames without populating the MAC address table.

Learning The switch port listens to BPDUs and learns all the paths in the switched network. A port in learning state populates the MAC address table but doesn't forward data frames.

Forwarding The port sends and receives all data frames on the bridged port.

Disabled A port in the disabled state does not participate in the frame. forwarding or STP. A port in the disabled state is virtually nonoperational. In Blocking States, all ports are in blocking state. The purpose of the blocking state is to prevent the use of looped paths. The forward state sends and receives the all data frames in a loop free network. So these two states are considered to be fully converged.

第9题：

Catalyst 6500 (Catalyst OS系统)中设置主root的命令格式是______。A.spanning－tree lan r

Catalyst 6500 (Catalyst OS系统)中设置主root的命令格式是______。

A．spanning-tree lan ＜vans＞ root primary

B．spanning-tree lan ＜vans＞ root secondary

C．set spantree root ＜vans＞

D．set spantree root secondary ＜vans＞

正确答案：C
解析：选项A、B分别是Catalyst 3500(CiscoIOS系统)的STP主root、备份root设置命令；选项D是Catalyst6500 (Catalyst OS系统)的STP备份root设置命令，故选C。

第10题：

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

正确答案:B,D

Which of the following components must be elected before the Spanning Tree Protocol can converge in a switched LAN?A. Designated ports.B. Duplex operating mode.C. Fast mode ports.D. Root bridge.E. Root ports.F. BDPU priority.

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