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What value is primarily used to determine which port becomes

题目
单选题
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

参考答案和解析
正确答案： C
解析： 暂无解析
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相似问题和答案

第1题：

What is the purpose of the OSPF router ID in a OR／BOR election?()

A. It is used with the OSPF priority values to determine which OSPF router will become the DR or BOR in a point-to-point network

B. It is used with the OSPF priority values to determine which interface will be used to form a neighbor relationship with another OSPF router

C. It is used with the OSPF priority values to determine which router will become the DR or BOR in a multi access network

D. It is used to determine which interfaces will send Hello packets to neighboring OSPF routers


参考答案：C

第2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

正确答案:E

第3题：

What value is primarily used to determine which port becomes the root port on each nonroot 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

F. None of the above


正确答案：A
A 解析：Explanation:
At the conclusion of the root bridge election process, the switches move on to selecting Root Ports. The Root Port of a bridge is the port that is closest to the Root Bridge in terms of Path Cost.

Every non-Root Bridge must select one Root Port. Again, bridges use the concept of cost to measure closeness. As with some routing metrics, the measure of closeness using STP is not necessarily reflected by hop count. Specifically, bridges track what is referred to as Root Path Cost, which is the cumulative cost of all links to the Root Bridge.

第4题：

What is the purpose of a network mask?（）

  • A、It is used in conjunction with the wildcard mask to determine the number of hosts on a network
  • B、It is used to define which parts of the IP address are allocated to host addresses and network prefixes
  • C、It is used to hide subnets from external networks by masking the subnets with NAT
  • D、It is used to differentiate a network as a classful network or a classless network

正确答案:B

第5题：

What two things will occur when an edge port receives a BPDU？（）

  • A、The port immediately transitions to the Forwarding state.
  • B、The switch generates a Topology Change Notification （TCN） BPDU.
  • C、The port immediately transitions to the err-disable state.
  • D、The port becomes a normal STP switch port.

正确答案:B,D

第6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

正确答案:E

第7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

正确答案:A

第8题：

Which of the following is primarily used for VoIP?()

A.TLS

B.RDF

C.NTP

D.RTP


参考答案：D

第9题：

An administrator needs to determine what the default run level of a system is.  Which command would be used（）

  • A、Isitab init
  • B、telinit -d
  • C、cat/etc/.init.state
  • D、init

正确答案:A

第10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

正确答案:A,C,D

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