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What are the differences between full-duplex Ethernet and ha

题目
多选题
What are the differences between full-duplex Ethernet and half-duplex Ethernet?（）
A

Half-duplex Ethernet operates in a shared collision domain.

B

Full-duplex Ethernet has a lower effective throughput.

C

Half-duplex Ethernet operates in a private collision domain.

D

Full-duplex Ethernet allows two-way communication.

E

Half-duplex Ethernet operates in a private broadcast domain.

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相似问题和答案

第1题：

Which of the following statements correctly describe the differences between half-duplex and full-duplex Ethernet? (Select two answer choices.)

A．Full-duplex Ethernet uses CSMA/CD to prevent collisions.

B．Half-duplex Ethernet uses a loopback circuit to detect collisions.

C．A full-duplex Ethernet card allows 20Mbps for data transmission.

D．Full-duplex Ethernet makes use of two pairs of wires for data.

E．An Ethernet hub can operate both half and full duplex simultaneously.


正确答案：BD
解析：Explanation:
Half-duplex Ethernet send and receives on the same line, so a loopback needs to be set to detect collisions. Alternatively, full-duple Ethernet doesn't have to because it uses two pairs of wire, one to send and the other to receive. Collisions are not possible on full duplex Ethernet networks.

Incorrect Answers:
A. Full duplex uses both pairs of wires, so transmissions are sent on the first pair, and data that is received come in on the other pair. This prevents collisions.

C. Full duplex allows for data to be sent and received at the same time. It will not double the amount of bandwidth at any given time. The speed of the Ethernet link will remain at 10/100.

E. Hubs are shared devices and can only support one mode, unlike switches.

第2题：

In Ethernet networks, duplex mismatches will lower performance. Which error statistics can be seen if a duplex mismatch is present?()

A.collisions on the full-duplex side; runts on the half-duplex side

B.collisions on the full-duplex side; collisions on the half-duplex side

C.collisions on the half-duplex side; framing errors on the full-duplex side

D.collisions on the half-duplex side; giants on the full-duplex side


参考答案：C

第3题：

Which three statements are true about the operation of a full-duplex Ethernet network, which is being used in the Ezonexam LAN? (Choose three)

A．Ethernet hub ports are preconfigured for full-duplex mode.

B．The host network card and the switch port must be capable of operating in full-duplex mode.

C．There are no collisions in full-duplex mode.

D．In a full-duplex environment, the host network card must check for the availability of the network media before transmitting.

E．A dedicated switch port is required for each full-duplex node.


正确答案：BCE
解析：Explanation:
Half-duplex Ethernet is defined in the original 802.3 Ethernet and Cisco says you only use one wire pair with a digital signal running in both directions on the wire. It also uses the CSMA/CD protocol to help prevent collisions and to permit retransmitting if a collision does occur. If a hub is attached to a switch, it must operate in half-duplex mode because the end stations must be able to detect collisions.

Half-duplex Ethernet-typically 10BaseT-is only about 30 to 40 percent efficient as Cisco sees it, because a large 10BaseT network will usually only give you 3- to 4Mbps-at most. Full-duplex Ethernet uses two pairs of wires, instead of one wire pair like half duplex. Also, full duplex uses a point-to-point connection between the transmitter of the transmitting device and the receiver of the receiving device, which means that with full-duplex data transfer, you get a faster data transfer compared to half duplex.

And because the transmitted data is sent on a different set of wires than the received data, no collisions occur. The reason you don't need to worry about collisions is because now Full-duplex Ethernet is like a freeway with multiple lanes instead of the single-lane road provided by half duplex. Full-duplex Ethernet is supposed to offer 100 percent efficiency in both directions; this means you can get 20Mbps with a 10Mbps Ethernet running full duplex, or 200Mbps for FastEthernet.

第4题：

What are the main differences between traditional and modern logistics? （）

  • A、Containerization techniques
  • B、Information techniques
  • C、A and B
  • D、GPS, EDI, POS and so on

正确答案:C

第5题：

What are the differences between full-duplex Ethernet and half-duplex Ethernet?（）

  • A、Half-duplex Ethernet operates in a shared collision domain.
  • B、Full-duplex Ethernet has a lower effective throughput.
  • C、Half-duplex Ethernet operates in a private collision domain.
  • D、Full-duplex Ethernet allows two-way communication.
  • E、Half-duplex Ethernet operates in a private broadcast domain.

正确答案:A,D

第6题：

In a Bridged 1483 network, what Layer 2 encapsulations are passed between the DSL bridge and the ERX?()

A. single ATM header

B. single Ethernet header

C. ATM header followed by a PPP header

D. ATM header followed by an Ethernet header


参考答案：D

第7题：

Which of the following describes the paradox of the schools?

A.Discrepancy between what they say and what they do.
B.Differences between teachers' problems and schools' problems.
C.Advantages and disadvantages of students’ learning opportunities.
D.Students' perception and the reality of their performance on assessments.

答案：D
解析：
细节题。根据关键词定位到第四段。根据原文“Their achievement results fed into the implicit mission of schools:the greater the spread of achievement among students, the more it reinforcedthe rank order. This is why, if some students gave up and stopped trying (even dropped out of school),that wasregarded as the student's problem, not the teacher's or the school's.”可知，学生之间成绩流传得越广，成绩的排名就越固定。结合前文及此处内容，也就是说成绩决定了学生学习的态度，态度决定了他们的排名表现。故本题选D。

第8题：

When you compare the differences between half-duplex and full-duplex Ethernet, which of the following characteristics are exclusive to half-duplex? (Select two answer choices)

A．Half-duplex Ethernet operates in a shared collision domain.

B．Half-duplex Ethernet operates in an exclusive broadcast domain.

C．Half-duplex Ethernet has efficient throughput.

D．Half-duplex Ethernet has lower effective throughput.

E．Half-duplex Ethernet operates in an exclusive collision domain.


正确答案：AD
解析：Explanation:
A single device could not be sending a frame. and receiving a frame. at the same time because it would mean that a collision was occurring. So, devices simply chose not to send a frame. while receiving a frame. That logic is called half-duplex logic.

Ethernet switches allow multiple frames to be sent over different ports at the same time. Additionally, if only one device is connected to a switch port, there is never a possibility that a collision could occur. So, LAN switches with only one device cabled to each port of the switch allow the use of full-duplex operation. Full duplex means that an Ethernet card can send and receive concurrently.

Incorrect Answers:
B. Full duplex effectively doubles the throughput of half-duplex operation, because data can be both sent and received at the full 10/100 speed.

C, E. In half duplex operation, the network is shared between all devices in the collision domain.

第9题：

Which statement is true about full-duplex Ethernet in comparison to half-duplex Ethernet?（）

  • A、Full-duplex Ethernet consists of a shared cable segment. Half-duplex Ethernet provides a point-to-point link.
  • B、Full-duplex Ethernet uses a loopback circuit to detect collisions. Half-duplex Ethernet uses a jam signal.
  • C、Full-duplex Ethernet can provide higher throughput than can half-duplex Ethernet of the same bandwidth.
  • D、Full-duplex Ethernet uses two wires to send and receive. Half-duplex Ethernet uses one wire to send and receive.

正确答案:C

第10题：

Which connections allow the use of full-duplex Ethernet?（）

  • A、Switch to host
  • B、Switch to switch
  • C、Hub to hub
  • D、Switch to hub
  • E、Host to host

正确答案:A,B,E

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