On a half-duplex Ethernet LAN, two hosts attempt to send data simultaneously,resulting in a collision. Following this collision, what will the hosts do?（）A、The destination host sends a request to the source for retransmission.B、The jam signal indicates th

题目

On a half-duplex Ethernet LAN, two hosts attempt to send data simultaneously,resulting in a collision. Following this collision, what will the hosts do?（）

A、The destination host sends a request to the source for retransmission.
B、The jam signal indicates that the collision has been cleared.
C、The hosts will attempt to resume transmission after a time delay has expired.
D、An electrical pulse indicates that the collision has cleared.
E、The router on the segment will signal that the collision has cleared.
F、The hosts will do nothing, as the higher layers are responsible for data error correction and re-transmission.

参考答案和解析

正确答案:C

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第1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2题：

● 10BaseT is an Ethernet LAN term meaning a maximum transfer rate of 10Mbps that uses baseband signaling and twisted pair cabling. A 10BaseT Ethernet LAN has a （71） topology.

（71）

A．star

B．ring

C．bus

D．none of the above

正确答案：A

第3题：

You want to upgrade the Ezonexam LAN so that all ports operate in full duplex mode. Which statement is true about full-duplex Ethernet when comparing to half-duplex Ethernet?

A．Full-duplex Ethernet consists of a shared cable segment. Half-duplex provides a point-to-point link

B．Full-duplex Ethernet uses two wires to send and receive. Half-duplex Ethernet uses one wire to send and receive

C．Full-duplex Ethernet can provide higher throughput than can half-duplex Ethernet of the same bandwidth

D．Full-duplex Ethernet uses a loopback circuit to detect collisions. Half-duplex Ethernet uses a jam signal

E．None of the above

正确答案：C

第4题：

Which of the following LAN technologies is defined as fast Ethernet?()

A.10Base-T

B.100Base-T

C.100Base-FX

D.1000Base-T

参考答案：B

第5题：

Which of the following LAN technologies is considered fast Ethernet and uses two pairs of cabling,one pair for sending and the other pair for receiving?()

A.100Base-T4

B.100Base-TX

C.100Base-X

D.100Base-FX

参考答案：B

第6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7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8题：

The Ezonexam LAN is upgrading all devices to operate in full duplex. Which statement is true about full-duplex Ethernet in comparison to half-duplex Ethernet?

A．Full-duplex Ethernet uses two wires to send and receive. Half-duplex Ethernet uses one wire to send and receive

B．Full-duplex Ethernet consists of a shared cable segment. Half-duplex Ethernet provides a point-to-point link

C．Full-duplex Ethernet can provide higher throughout than can half-duplex Ethernet of the same bandwidth

D．Full-duplex Ethernet uses a loopback circuit to detect collisions. Half-duplex ethernet uses a jam signal

E．None of the above

正确答案：C

第9题：

下列属于共享介质局域网的是( )。 Ⅰ．Ethernet Ⅱ．SwiShed Ethernet Ⅲ．FDDI Ⅳ．ATM LAN Ⅴ．Token Bus Ⅵ．Token Ring

A．Ⅰ、Ⅱ、Ⅲ、Ⅵ

B．Ⅰ、Ⅱ、Ⅳ、Ⅴ

C．Ⅱ、Ⅲ、Ⅳ、Ⅴ

D．Ⅰ、Ⅲ、Ⅴ、Ⅵ

正确答案：D
解析：交换式局域网有Switched Ethernet 与 ATM LAN；Ethernet、FDDI、Token Bus和Token Ring属于共享介质局域网。

第10题：

Which two of these are characteristics of Metro Ethernet? ()

A. class of service

B. bandwidth profiles

C. user-network interface

D. Ethernet LAN circuit attributes

E. Ethernet virtual circuit attributes

参考答案：C, E

On a half-duplex Ethernet LAN, t

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