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单选题VLAN Tagging, also known as Frame Tagging, is a method developed by Cisco to help identify packets travelling through trunk links. When an Ethernet frame traverses a trunk link, a special VLAN tag is added to the frame and sent across the trunk link .H

题目
单选题
VLAN Tagging, also known as Frame Tagging, is a method developed by Cisco to help identify packets travelling through trunk links. When an Ethernet frame traverses a trunk link, a special VLAN tag is added to the frame and sent across the trunk link .How does ERS use the VLAN tag?（）
A

provide service internetworking

B

support transparency for Layer 2 frames

C

indicate destination as a connection identifier

D

map to the DLCI in service internetworking

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相似问题和答案

第1题：

The ERX Edge Router is configured for PPP over Ethernet without using VLAN tagging. How many PPP over Ethernet major interfaces can be configured per port?()

A.1

B.100

C.2048

D.4096


参考答案：A

第2题：

Which two statements are correct regarding units in JUNOS?()

A.Units in JUNOS are always required for any interface configured with logical addresses such as IP and IPv6.

B.Units in JUNOS are only required when you are configuring sub-interfaces for inter-VLAN routing.

C.Unit numbers must match the DLCI or VCI numbers configured on the interface.

D.Unit 0 is the only value allowed on interfaces running HDLC, PPP, or for Ethernet interfaces not doing VLAN-tagging.


参考答案：A, D

第3题：

VLAN的Trunk实现采用Frame－Tagging()方式,目前常用的两个标准分别是()和()。


答案：帧标记,ISL：Inter-Switchlink，是Cisco交换机独有的协议,IEEE802.1Q：是国际标准协议，被几乎所有的网络设备生产商所共同支持

第4题：

Refer to the exhibit A frame on vlan 1 on switch s1 is sent to switch s2 when the frame is received on vlan 2,what causes this behavior?()

A.trunk mode mismatches

B.vlans that do not correspond to a unique IP subnet

C.native vlan mismatches

D.allowing only vlan 2 on the destination.


参考答案：C

第5题：

The network administrator has just finished installing a new 10/100/1000 switch, but receives reports from the server administrator that servers connected to the new switch seem to be experiencing slow LAN connections. The network administrator checks the port connecting the new switch to the core switch and sees the following information:Which of the following is the MOST likely cause of the slow connections?（）

A. The servers have not had VLAN tagging enabled on their NICs.

B. Speed and duplex have not been set.

C. VLAN tagging was not set on the trunk.

D. The servers have been connected with CAT5 cable.


参考答案：B

第6题：

You would like to view all Fast Ethernet interfaces currently using VLAN tagging and the specific VLANs each interface is using.Which CLI command displays this information?()

A.A

B.B

C.C

D.D


参考答案：C

第7题：

Which statement is correct about logical units on Juniper Router interfaces?()

A.Logical units are used only when a Layer 2 identifier is present such as a VLAN

B.A logical unit of 0 is required when using a frame-relay DLCI

C.A logical unit is always required

D.Logical units are not required unless ATM or 802.1Q VLAN tagging is configured.


参考答案：C

第8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9题：

VLAN Tagging, also known as Frame Tagging, is a method developed by Cisco to help identify packets travelling through trunk links. When an Ethernet frame traverses a trunk link, a special VLAN tag is added to the frame and sent across the trunk link .How does ERS use the VLAN tag?（）

A. provide service internetworking

B. support transparency for Layer 2 frames

C. indicate destination as a connection identifier

D. map to the DLCI in service internetworking


参考答案：C

第10题：

Which statement about Remotely Triggered Black Hole （RTBH） is true？（）

  • A、Route tagging is one of the techniques used by RTBH
  • B、It is used for BGP authentication
  • C、It cannot work with static routes
  • D、It uses extended ACLs for blocking attacks by creating a black hole
  • E、Before configuring RTBH LDP must be enabled on the interface

正确答案:A

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