With regard to Ethernet media access methods, which of the following are true?()A、A device waits for an electronic signal before transmitting.B、A device listens and waits until the media is not busy before transmitting.C、All devices on an Ethernet segment

题目

With regard to Ethernet media access methods, which of the following are true?()

  • A、A device waits for an electronic signal before transmitting.
  • B、A device listens and waits until the media is not busy before transmitting.
  • C、All devices on an Ethernet segment see data that passes on the network medium.
  • D、Only the sender and the receiver devices see data that passes on the network medium.
  • E、Ethernet networks allow you to configured devises with higher transmission priority.
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相似问题和答案

第1题:

Regarding PAR (Positive Acknowledgement and Re-transmission), which of the answer choices below are correct?()

A. The source device will only retransmit lost packets on the request of the destination device.

B. The source device starts a timer when it sends a segment and retransmits if an acknowledgment is not received before the timer expires.

C. The destination device acknowledges receipt of a segment by sending a packet with a new sequence number and the ACK bit sent.

D. The destination device acknowledges receipt of a segment by sending a packet that indicates the next sequence number it expects.

E. If the destination device does not receive a segment, all segments are retransmitted.

F. The source device keeps a record of all segments sent and expects and acknowledgment of each.


参考答案:B, D, F

第2题:

Which of the following devices can an administrator use to segment their LAN?()

A. Hubs

B. Repeaters

C. Switches

D. Bridges

E. Routers

F. Media Converters

G. All of the above


参考答案:C, D, E

第3题:

Two stations on the Ezonexam LAN transmit at the same time, resulting in a collision. What happens when a collision occurs on the network? (Choose all that apply)

A.Each device on the Ethernet segment stops transmitting for a short time.

B.A jam signal informs all devices that a collision occurred.

C.When data transmission resumes, the devices that were involved in the collision have priority to transmit.

D.The devices that are involved in the collision stops transmitting for a short time.

E.The collision invokes a random back-off algorithm.


正确答案:BDE
解析:Explanation:
When a host on an Ethernet LAN has information to send, the following steps are taken:
1. A device with a frame. to send listens until Ethernet is not busy.
2. When the Ethernet is not busy, the sender begins sending the frame.
3. The sender listens to make sure that no collision occurred.
4. Once the senders hear the collision, they each send a jamming signal, to ensure that all stations recognize the collision.
5. After the jamming is complete, each sender randomizes a timer and waits that long.
6. When each timer expires, the process starts over with step 1.

Incorrect Answers:
A. Only the stations involved in the collision stop transmitting for a short time, not all stations on the LAN.
C. No priority is given to any stations once a collision has occurred.

第4题:

Which two statements are true regarding an Ethernet collision domain?()

  • A、If a switch is used, the collision domain is limited to each device and the switch
  • B、If a hub is used, the collision domain is limited to each device and the hub
  • C、If a hub is used, the collision domain includes all devices connected to the hub
  • D、If a switch is used, the collision domain includes all devices connected to the switch

正确答案:A,C

第5题:

Which statement about VPLS is true?()

  • A、All CE devices emulate a bridge
  • B、All provider devices emulate a bridge
  • C、Hierarchical VPLS reduces signaling overhead
  • D、Each PE device emulates a bridge
  • E、Each CE device emulates a bridge

正确答案:C

第6题:

Two stations on a LAN transmit at the same time, resulting in a collision. What happens when a collision occurs on the network?()

A. Each device on the Ethernet segment stops transmitting for a short time.

B. A jam signal informs all devices that a collision occurred.

C. When data transmission resumes, the devices that were involved in the collision have priority to transmit.

D. The devices that are involved in the collision stops transmitting for a short time.

E. The collision invokes a random back-off algorithm.


参考答案:B, D, E

第7题:

Which of the following statements are true for routers but not true for Layer 3 Ethernet switches?(Choose all that apply.)()

  • A、May have Ethernet as well as non-Ethernet interfaces
  • B、Traditionally used as a standalone device for inter-VLAN communication
  • C、Makes use of TCAMs
  • D、Uses subinterfaces to define trunks
  • E、Can use both Layer 2 and Layer 3 to make forwarding decisions
  • F、Allows the definition of Switched Virtual Interfaces(SVI)

正确答案:A,B,D

第8题:

With regard to Ethernet media access methods, which of the following are true?

(Choose all that apply.)

A.A device waits for an electronic signal before transmitting.

B.A device listens and waits until the media is not busy before transmitting.

C.All devices on an Ethernet segment see data that passes on the network medium.

D.Only the sender and the receiver devices see data that passes on the network medium.

E.Ethernet networks allow you to configured devises with higher transmission priority.


正确答案:BC
解析:Explanation:
Ethernet uses the CSMA/CD access method.
CSMA/CD logic helps prevent collisions and also defines how to act when a collision does occur. The CSMA/CD algorithm words like this:
1. A device with a frame. to send listens until the Ethernet is not busy.
2. When the Ethernet is not busy, the sender begins sending the frame.
3. The sender listens to make sure that no collision occurred.
4. Once the senders hear the collision, they each send a jamming signal, to ensure that all stations recognize the collision.
5. After the jamming is complete, each sender randomizes a timer and waits that long.
6 When each timer expires, the process starts over with Step 1.
So, all devices on the Ethernet need to use CSMA/CD to avoid collisions and to recover when inadvertent collisions occur.

第9题:

Which of the following problems has occurred when a menu appears and prompts the user to "copy a dump to external media?()

  • A、 The external dump device is full. 
  • B、 The dump device was set to /dev/hd7 before the dump happened. 
  • C、 The boot failed while copying the dump from paging space to a file. 
  • D、 The dump device was not set to a paging device before the dump happened.

正确答案:C

第10题:

Which of the following are true of Ethernet technology?()

  • A、Hosts use a logical ring topology.
  • B、Hosts use a logical bus topology
  • C、Hosts must wait for an electronic signal to transfer data.
  • D、Hosts are directly connected to a wiring concentrator called a MSAU.

正确答案:B

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