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For the following ports， which port is on every bridge in a 

题目
单选题
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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相似问题和答案

第1题：

Which of the following ports would have to be allowed through a firewall to allow SNMP traffic topass on its default port?() (Select TWO).

A.22

B.23

C.143

D.161

E.162

F.8080


参考答案：D, E

第2题：

Which of the following devices would need to be configured to block specific ports and protocols from entering the network?()

A. Bridge

B. Firewall

C. Port replicator

D. Gateway


参考答案：B

第3题：

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.


正确答案：ADE
A,D,E 解析：Explanation:
Designated port: Either a root port or a port that has been determined as having the best (lower) cost-a designated port will be marked as a forwarding port.

Root bridge: The root bridge is the bridge with the best bridge ID. With STP, the key is for all the switches in the network to elect a root bridge that becomes the focal point in the network. All other decisions in the network-like which port is to be blocked and which port is to be put in forwarding mode-are made from the perspective of this root bridge.

Root port: Always the link directly connected to the root bridge, or the shortest path to the root bridge. If more than one link connects to the root bridge, then a port cost is determined by checking the bandwidth of each link. The lowest cost port becomes the root port.

So these three components must be elected before the spanning tree protocol can converge in a switched LAN

第4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.

正确答案:D

第5题：

Free Radio Pratique will be granted by the Port Health Office in the following case ______ ．

A.Vessel with a case or suspected case of infectious disease on board

B.Vessel with a dead body on board

C.Vessel which has visited plague-infected ports during the current voyage

D.Cargo vessel which hasn't called at any plague infected ports during the current voyage and on which there is not any case of infectious disease，or any dead body


正确答案：D

第6题：

Which of the following is required if ports from VLANs on two separate switches need to broadcastto each other?()

A. Port mirroring

B. VPN

C. Trunking

D. Port authentication


参考答案：C

第7题：

材料：If，by reason of or in compliance with any such directions or recommendations，the vessel does not proceed to the port or ports named in the Bill of Lading or to which she may have been ordered pursuant thereto，the Vessel may proceed to any port as directed or recommended or to any safe port which the Owners in their discretion may decide on and there discharge the cargo．Such discharge shall be deemed to be due fulfillment of the contract of affreightment and the Owners shall be entitled to freight as if discharge had been effected at the port or ports named in the Bill of Lading or to which the Vessel may have been ordered pursuant thereto．

问题：If the vessel does not, under the directions of the Charterer, proceed to the port or ports named in the Bill of Lading or to which she may have been ordered pursuant thereto to, she may proceed to all the following ports except ______ ．

A.any port as directed

B.any port as recommended

C.any safe port which the Owners in their discretion may decide on

D.the port or ports of origin

At the substituted port, the carrier is entitled to ______ freight if he had dilivered full cargo there．A.full freight

B.half freight

C.no freight

D.reasonable freight

The contract of affreightment is referred to ______ ．A.a contract of carriage by which the carrier is entitled to carry certain amount of cargo in a specified time by any vessel or vessels either belonging to himself or to others

B.a contract of carriage, such as Gencon

C.a contract of trade

D.a contract of sales

This is a ______ ．A.a clause of a contract

B.an explanation of a clause in a contract

C.a requirement from a government

D.an article of an international convention

请帮忙给出每个问题的正确答案和分析，谢谢！


问题 1 答案解析：D


问题 2 答案解析：A


问题 3 答案解析：B


问题 4 答案解析：B

第8题：

When adding a FireWire adapter to a laptop, which of the following ports would MOST likely beused? ()

A. MMC port

B. SODIMM slot

C. Express card 34

D. USB 1.1 port


参考答案：C

第9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

正确答案:C

第10题：

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

正确答案:A

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