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The Company core switches use 802.1Q trunks to connect to ea

题目
单选题
The Company core switches use 802.1Q trunks to connect to each other.  How does 802.1Q  trunking keep track of multiple VLANs？ （）
A

 It tags the data frame with VLAN information and recalculates the CRC value

B

 It encapsulates the data frame with a new header and frame check sequence

C

 It modifies the port index of a data frame to indicate the VLAN

D

 It adds a new header containing the VLAN ID to the data frame

E

 None of the other alternatives apply

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相似问题和答案

第1题：

To which switch or switches should you provide redundant links in order to achieve high availability with reliable fast convergence in the enterprise campus?()

A. to a core switch running Cisco NSF and SSO from redundant distribution switches connected with a Layer 2 link

B. to a core switch running Cisco NSF and SSO from redundant distribution switches connected with a Layer 3 link

C. to two core switches from redundant distribution switches connected with a Layer 2 link

D. to two core switches from redundant distribution switches connected with a Layer 3 link

E. to two core switches running Cisco NSF and SSO from two redundant distribution switches running Cisco NSF and SSO


参考答案：D

第2题：

Which three of these statements regarding 802.1Q trunking are correct? ()

A.802.1Q native VLAN frames are untagged by default.

B.802.1Q trunking ports can also be secure ports.

C.802.1Q trunks can use 10 Mb/s Ethernet interfaces.

D.802.1Q trunks require full-duplex, point-to-point connectivity.

E.802.1Q trunks should have native VLANs that are the same at both ends.


参考答案：A, C, E

第3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4题：

The core Company switches are configured to use 802.1Q trunks.  Which three statements are  correct with regard to the IEEE 802.1Q standard？（）

  • A、 The IEEE 802.1Q frame format adds a 4 byte field to a Ethernet frame
  • B、 The packet is encapsulated with a 26 byte header and a 4 byte FCS
  • C、 The protocol uses point-to-multipoint connectivity
  • D、 The protocol uses point-to-point connectivity
  • E、 The IEEE 802.1Q frame uses multicast destination of 0x01-00-0c-00-00
  • F、 The IEEE 802.1Q frame retains the original MAC destination address

正确答案:A,D,F

第5题：

To which switch or switches should you provide redundant links in order to achieve high availability with reliable fast convergence in the enterprise campus？（）

  • A、 to a core switch running Cisco NSF and SSO from redundant distribution switches connected with a Layer 2 link
  • B、 to a core switch running Cisco NSF and SSO from redundant distribution switches connected with a Layer 3 link
  • C、 to two core switches from redundant distribution switches connected with Layer 2 link
  • D、 to two core switches from redundant distribution switches connected with Layer 3 link
  • E、 to two core switches running Cisco NSF and SSO from two redundant distribution switches running Cisco NSF and SSO

正确答案:D

第6题：

Which two of these are recommended practices with trunks? ()

A. use ISL encapsulation

B. use 802.1q encapsulation

C. set ISL to desirable and auto with encapsulation negotiate to support ILS protocol negotiation

D. use VTP server mode to support dynamic propagation of VLAN information across the network

E. set DTP to desirable and desirable with encapsulation negotiate to support DTP protocol negotiation.


参考答案：B, E

第7题：

Which two of these are recommended practices with trunks？ （）

  • A、 use ISL encapsulation
  • B、 use 802.1q encapsulation
  • C、 set ISL to desirable and auto with encapsulation negotiate to support ILS protocol negotiation
  • D、 use VTP server mode to support dynamic propagation of VLAN information across the network 
  • E、 set DTP to desirable and desirable with encapsulation negotiate to support DTP protocol negotiation.

正确答案:B,E

第8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9题：

Company uses layer 3 switches in the Core of their network. Which method of Layer 3 switching  uses a forwarding information base （FIB）？（）

  • A、Topology-based switching
  • B、Demand-based switching
  • C、Route caching
  • D、Flow-based switching
  • E、None of the other alternatives apply

正确答案:A

第10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.

正确答案:B,D

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