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In a switched environment, what does the IEEE 802.1Q standar

题目
单选题
In a switched environment, what does the IEEE 802.1Q standard describe?（）
A

the operation of VTP

B

a method of VLAN trunking

C

an approach to wireless LAN communication

D

the process for root bridge selection

E

VLAN pruning vlan

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相似问题和答案

第1题：

You need to decide on which trunking method to implement in the Ezonexam network. What is a characteristic of ISL and 802.1q frame. tagging in a switched LAN environment?

A．They are used to find the best path through a network.

B．They allow the exchange of filtering tables.

C．They specify different implementations of the Spanning-Tree Protocol.

D．They allow the exchange of routing tables

E．They provide inter-switch VLAN communication.


正确答案：E
解析：Explanation: A trunk link is the other type of Layer 2 port supported on Cisco switches. When a trunk port is configured, it begins marking frames as they exit the port to indicate which VLAN each frame. is associated with.

The trunk port can also read the markings, called tags, as they enter the trunk port. This enables the switch to send a frame. only to the ports for the given VLAN associated with the incoming frame. The main purpose of trunking is to carry traffic between switches and maintain the VLAN information.

Unlike an access link, the trunk link does not belong to a single VLAN but instead can carry traffic from several VLANs over a point-to-point link between two devices that understand the protocol. Two forms of trunking are used for Cisco switches on Ethernet networks: An IEEE industry standard called IEEE 802.1Q.

This is a frame-tagging mechanism that adds a VLAN identifier to the frame. by inserting a tag at Layer 2. Another form. of trunking on Cisco switches is called Inter-Switch Link (ISL), which is a Cisco proprietary trunking mechanism. ISL uses a frame. encapsulation method that adds a header to identify the VLAN.

Incorrect Answers:
A, D. These are the functions of routers, not switches.

B. Filtering tables can be used on certain Catalyst switches via the use of VLAN access control lists, but this information is never shared between switches.

C. A separate STP instance is created for each VLAN, but the STP implementation remains the same.

第2题：

In the Ezonexam switched LAN environment, what does the IEEE 802.1Q standard describe?

A. VLAN pruning

B. A method of VLAN trunking

C. An approach to wireless LAN communication

D. The operation of VTP

E. The process for root bridge selection

F. None of the above


正确答案：B
B 解析：Explanation:
A broadcast domain must sometimes exist on more than one switch in the network. To accomplish this, one switch must send frames to another switch and indicate which VLAN a particular frame. belongs to. On Cisco switches, a trunk link is created to accomplish this VLAN identification. ISL and IEEE 802.1Q are different methods of putting a VLAN identifier in a Layer 2 frame.

The IEEE 802.1Q protocol interconnects VLANs between multiple switches, routers, and servers. With 802.1Q, a network administrator can define a VLAN topology to span multiple physical devices. Cisco switches support IEEE 802.1Q for FastEthernet and Gigabit Ethernet interfaces. An 802.1Q trunk link provides VLAN identification by adding a 4-byte tag to an Ethernet Frame. as it leaves a trunk port.

第3题：

一台Cisco交换机和一台3COM交换机相连，相连端口都工作在Ⅵ,AN trunk模式，这两个端口应使用的VLAN协议是——。

A．ISL和IEEE 802．10

B．ISL和ISL

C．ISL和IEEE 802．1Q

D．IEEE 802．1Q和IEEE 802．1Q


正确答案：D
解析：ISL(Inter—Switch Link Protoc01)，交换链路内协议，是Cisco私有协议，主要用于维护交换机和路由器间的通信流量等VLAN信息。802.1Q协议，即Virtual Bridged I.oeal Area Networks协议。主要规定了VLAN的实现，是国际标准。不同厂家交换机互联，要实现VLAN Trunk功能，必须在直连的两台交换机端口都使用802.1Q协议。由上可知，答案选D)。

第4题：

Which of the following may illustrate the difference between "competence" and__________ "performance"?

A．What a person "knows" and what he/she "does".
B．What a person "can do" and what he/she "does".
C．What a person "does" and what he/she "knows".
D．What a person "does" and what he/she "can do".

答案：A
解析：
考查语言学知识。competence“语言能力”，指语言使用者对于语言规则系统的潜在意识；performance“语言运用”，指在具体场景中语言的实际运用，二者对应的分别为“knows”和“does”。故选A。

第5题：

In a switched environment, what does the IEEE 802.1Q standard describe?()

A.the operation of VTP

B.a method of VLAN trunking

C.an approach to wireless LAN communication

D.the process for root bridge selection

E.VLAN pruning vlan


参考答案：B

第6题：

What must the Ezonexam network administrator do in order to successfully configure a VLAN trunk between two switches named VE1 and VE2? (Select two answer choices)

A. Set each end of the trunk line to IEEE 802.1Q encapsulation.

B. Set the same VTP management domain name on both switches.

C. Set all ports on the two switched as access ports.

D. Configure one of the two switches as a VTP server.

E. Connect the two switches using a rollover cable.

F. Use a router to forward VTP traffic between the VLANs.


正确答案：BD
B,D 解析：Explanation:
All servers that need to share VLAN information must use the same domain name, and a switch can only be in one domain at a time. This means that a switch can only share VTP domain information with other switches if they're configured into the same VTP domain. You can use a VTP domain if you have more than one switch connected in a network, but if you've got all your switches in only one VLAN, you don't need to use VTP. VTP information is sent between switches via a trunk port.

Switches advertise VTP management domain information, as well as a configuration revision number and all known VLANs with any specific parameters. There's also something called VTP transparent mode, in it, you can configure switches to forward VTP information through trunk ports, but not to accept information updates or update their VTP databases. At least one of the switches will need to be configured as the VTP server in order to pass the VLAN info.

Incorrect Answers:
A. Although this is a valid option, it is not a requirement since using ISL as the encapsulation type is also a valid option.

E. A rollover cable is not used between switches for any of the port types.

F. Routers will be required for sending traffic from one VLAN to the other, but not to forward the actual VTP traffic.

第7题：

What must an administrator do in order to successfully configure a VLAN trunk between two switches?()

A. Set each end of the trunk line to IEEE 802.1Q encapsulation.

B. Set the same VTP management domain name on both switches.

C. Set all ports on the two switched as access ports.

D. Configure one of the two switches as a VTP server.

E. Connect the two switches using a rollover cable.

F. Use a router to forward VTP traffic between the VLANs.


参考答案：B, D

第8题：

一台Cisco交换机和一台3COM交换机相连，相连端口都工作在VLANTnmk模式下，这两个端口应使用的VLAN协议分别是(9)。

A．ISL和IEEE 802.10

B．ISL和ISL

C．ISL和IEEE 802.1Q

D．IEEE 802.1Q和IEEE 802.1Q


正确答案：D
解析：虚拟局域网中继(VLAN Trunk)技术是交换机与交换机之间、交换机与路由器之间存在一条物理链路，而在这一条物理链路上要传输多个VLAN信息的一种技术。VLAN Trunk的标准机制是帧标签。帧标签为每个帧指定一个唯一的VLAN ID作为识别码，表明该帧是属于哪个VLAN的。它在传送数据帧到网络主干时，会在每个帧的表头中放置一个唯一的识别码，交换机会解析与测试识别码。当数据帧从网络主干转发至目标终端之前，交换机会先移除这个识别码。在交换设备之间实现Trunk功能，必须遵守相同的VLAN协议。VLAN协议就是为VLAN帧标签定义的一组约定和规则。不同的VLAN协议规定了不同的VLAN帧标签格式和附加VLAN帧标签的方法。目前，在交换设备中常用的VLAN协议有ISL(Cisco公司内部交换链路协议)、IEEE 802.10(原为 FDDI的安全标准协议)和国际标准IEEE 802.1Q。其中，ISL(Inter-Switch Link)是Cisco交换机内部链路的一个VLAN协议，它仅适用于Cisco设备。IEEE 802.1Q俗称“Dot One Q”(dotlq)，是经过IEEE认证的一个VLAN协议，它是一个国际标准。IEEE 802.1Q可用于不同厂家的交换设备互连，是实现VLAN Trunk的唯一标准协议。因此，在不同厂家交换机互连，要实现VLAN Trunk功能时，必须在直接相连的两台交换机端口上都封装IEEE802.1Q协议，从而保证协议的一致性，否则不能正确地传输多个VLAN的信息。

第9题：

Refer to the exhibit. What does the (*) represent in the output?()

A.Packet is destined for a local interface to the router.

B.Packet was translated, but no response was received from the distant device.

C.Packet was not translated, because no additional ports are available.

D.Packet was translated and fast switched to the destination.


参考答案：D

第10题：

In a switched environment, what does the IEEE 802.1Q standard describe?（）

  • A、the operation of VTP
  • B、a method of VLAN trunking
  • C、an approach to wireless LAN communication
  • D、the process for root bridge selection
  • E、VLAN pruning vlan

正确答案:B

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