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An 802.1Q trunk̳

题目

An 802.1Q trunk is not coming up between two switches. The ports on both switches are configured as "switchport mode desirable." Assuming that there is no physical issue， choose two possible causes.（）

  • A、Incorrect VTP domain
  • B、Incorrect VTP password
  • C、Incorrect VTP mode
  • D、Incorrect VTP configuration revision
参考答案和解析
正确答案:A,B
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相似问题和答案

第1题：

You need to configure an 802.1Q link on a Ezonexam switch. Which commands, when used together, would do this? (Select two answer choices)

A. Switch(vlan) mode trunk

B. Switch(config) switchport access mode trunk

C. Switch(config-if) switchport mode trunk

D. Switch(config-if) switchport trunk encapsulation dot1q

E. Switch(config) switchport access mode 1

F. Switch(vlan) trunk encapsulation dot1q


正确答案：CD
C,D 解析：Explanation:
Creating this trunk link is a two step process. First you have to set the switchport mode to trunk, and then you configure the encapsulation. The giveaway on this question is the fact that to create a trunk on an interface, you have to be in interface configuration mode. So switchport mode trunk sets the trunk, and switchport trunk encapsulation dot1q sets the encapsulation.

第2题：

一台Cise0交换机和一台3COM交换机相连，相连端口都工作在VLAN 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
在交换设备之间实现Trunk功能，必须遵守相同的VLAN协议。国际标准IEEE802．IQ协议可使不同厂家的交换设备互连，是实现VLANTrunk的唯一标准协议。在不同厂家交换机互连，要实现VLANTrunk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3题：

Cisco Catalyst 6500交换机的3/1端口与一台其他厂商的交换机相连，并要求该端口工作在VLANTrunk模式。这两台交换机的Trunk端口都应封装的协议和Cisco Catalyst 6500设置Traank模式的正确配置语句分别是______。

A．ISL和set 3/1 trunk on isl

B．ISL和set trunk 3/1 on isl

C．IEEE 802.1Q和set tramk 3/1 on dotlq

D．IEEE 802.1Q和set 3/1 trunk on dotlq


正确答案：C

第4题：

当VLAN数据帧通过trunk链路转发时，将会在以太网帧中加入802.1Q标记，以区分不同VLAN的数据帧。该标记插入到了原始以太网帧的（）

  • A、目的MAC地址后
  • B、源MAC地址后
  • C、Type后
  • D、FCS前

正确答案:B

第5题：

基于802.1Q的VLAN实现VLAN跨交换机分布的技术是:()。

A.VLAN聚合技术

B.TRUNK技术

C.端口聚合技术

D.HGMP技术


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9题：

Which statements about 802.1Q trunking in Secure Network Foundation Design Guide for Single Site Deployments are correct？（）

  • A、The Cisco Control VLAN carries only Layer 2 control traffic
  • B、802.1Q trunking is used between the access switch and the router
  • C、There is no 802.1Q trunking used in these designs
  • D、When 802.1Q trunks are configured， they are also called Native VLANs
  • E、Trunking Ensures that traffic from only one VLAN is carried on that trunk

正确答案:B

第10题：

当VLAN数据帧通过trunk链路转发时，将会在以太网帧中加入802.1Q标记，以区分不同VLAN的数据帧。在802.1Q标记中，VLAN字段的最大可能值是（）

  • A、8192
  • B、4096
  • C、4092
  • D、4094

正确答案:D

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