Both bus and tree topologies are characterized by the use of multipoint (1).For the bus, all stations attach, through appropriate hardware (2) known as a tap, directly to a linear transmission medium, or bus. Full-duplex operation between the station and
题目
Both bus and tree topologies are characterized by the use of multipoint (1).For the bus, all stations attach, through appropriate hardware (2) known as a tap, directly to a linear transmission medium, or bus. Full-duplex operation between the station and the tap allows data to be transmitted onto the bus and received from the(3). A transmission from any station propagates the length of the medium in both directions and can be received by all other (4). At each end of the bus is a (5) , which absorbs any signal, removing it from the bus. 空白（5）处应选择（）
- A、tap
- B、repeat
- C、terminator
- D、concentrator
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更多“Both bus and tree topologies are characterized by the use of multipoint (1).For the bus, all stations attach, through appropriate hardware (2) known as a tap, directly to a linear transmission medium, or bus. Full-duplex operation between the station and ”相关问题
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第1题：
Both bus and tree topologies are characterized by the use of multipoint().
A.medium
B.connection
C.token
D.resource
正确答案：A
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第2题：
A ( )is a person who travels by train, plane or bus.A、visitor
B、stranger
C、patient
D、passenger
参考答案：D
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第3题：
Both bus and tree topologies are characterized by the use of multipoint (71) ．For the bus，all stations attach，through appropriate hardware (72) known as a tap，directly to a linear transmission medium，or bus．Full-duplex operation between the station and the tap allows data to be transmitted onto the bus and received from the (73) ．A transmission from any station propagates the length of the medium in both directions and can be received by all other (74) ．At each end of the bus is a (75) ，which absorbs any signal，removing it from the bus．
（71）
A．medium
B．connection
C．token
D．resource
正确答案：A
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第4题：
SCSI interfaces provide for faster data transmission rates (up to 80 megabytes per second) than standard serial and parallel ports. In addition, you can attach many devices to a single SCSI port, so that SCSI is really an I/O bus rather than simply an interface Which two statements about SCSI are true?（）
A. The bus is limited to 64 devices.
B. It is a full-duplex serial standard.
C. It is a half-duplex serial standard.
D. It allows up to 320 MB/s of shared channel bandwidth.
参考答案：C, D
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第5题：
乘船比乘车更有趣。
Taking a boat is_________ _________ than_________ a bus．
正确答案：
35．more fun，taking -
第6题：
CSMA, although more efficient than ALOHA or slotted ALOHA, still has one glaring inefficiency. If the medium is busy, the station will wait for a random amount of time. When two frames collide, the medium remains （请作答此空） for the duration of transmission of both damaged frames. The use of random delays reduces the probability of（ ）. For（ ）frames, compared to propagation time, the amount of wasted capacity can be considerable. This waste can be reduced if a station continues to listen to the medium while（ ）.The maximum utilization depends on the length of the frame and on the（ ） time; the longer the frames or the shorter the propagation time，the higher the utilization.A.convenient
B.inconvenient
C.usable
D.unusable答案：D解析：尽管CSMA的效率远远大于ALOHA或时隙ALOHA，但它依然存在一个显著低效率的情况。当信道繁忙的时候，站点需要等待一段随机时间。当两个帧发生冲突时，在两个被破坏帧的传输持续时间内，信道仍然无法使用。使用随机时延会降低冲突的可能性。但如果帧的长度相对于传播时间来说很长，那么容量的浪费也是非常可观的。如果站点在传输时还继续监听信道，就能减少这种浪费。最大利用率与帧长和传播时间有关，帧越长或者传播时间越短，利用率就越高。 -
第7题：
Both bus and tree topologies are characterized by the use of multipoint (1).For the bus, all stations attach, through appropriate hardware (2) known as a tap, directly to a linear transmission medium, or bus. Full-duplex operation between the station and the tap allows data to be transmitted onto the bus and received from the(3). A transmission from any station propagates the length of the medium in both directions and can be received by all other (4). At each end of the bus is a (5) , which absorbs any signal, removing it from the bus. 空白（2）处应选择（）
- A、processing
- B、switching
- C、routing
- D、interfacing
正确答案:D -
第8题：
Which of the following statements correctly describe the differences between half-duplex and full-duplex Ethernet?（）
- 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:B,D -
第9题：
Both bus and tree topologies are characterized by the use of multipoint (1).For the bus, all stations attach, through appropriate hardware (2) known as a tap, directly to a linear transmission medium, or bus. Full-duplex operation between the station and the tap allows data to be transmitted onto the bus and received from the(3). A transmission from any station propagates the length of the medium in both directions and can be received by all other (4). At each end of the bus is a (5) , which absorbs any signal, removing it from the bus. 空白（1）处应选择（）
- A、medium
- B、connection
- C、token
- D、resource
正确答案:A -
第10题：
An on-premise application is exposed to external users through a Windows Communication Framework （WCF） service endpoint registered in the Windows Azure AppFabric Service Bus. You need to recommend an approach for providing transport-level security that maximizes performance and minimizes bandwidth requirements. What should you recommend？（）
- A、 Use reliable messaging. Use HTTP for message delivery.
- B、 Use binary message encoding. Use TCP for message delivery.
- C、 Use Plain Old XML （POX） messages. Use TCP for message delivery.
- D、 Use Message Transmission Optimization Mechanism （MTOM） message encoding. Use HTTPS formessage delivery
正确答案:B -
第11题：
多选题You are designing a service that will use the Windows Azure AppFabric Service Bus. You need to recommend an approach for controlling access to the service by using the Windows Azure AppFabric Access Control Service. Which two actions should you recommend？（）AConfigure the service to not require authentication.
BConfigure the service to require a relay access token.
CSpecify message security for all communications between clients and the service.
DSpecify transport security for allcommunications between clients and the service.
正确答案： A,B解析： 暂无解析 -
第12题：
单选题Suppose half the people on a bus exit at each stop and no additional passengers board the bus. If on the third stop the next to last person exits the bus, then how many people were on the bus?A20
B16
C8
D4
正确答案： A解析：
这是一道算术题，我们用2*2*2就能得到答案，最先车上有8位乘客。 -
第13题：
For the bus, all stations attach, through appropriate hardware()known as a tap, directly to a linear transmission medium, or bus.
A.processing
B.switching
C.routing
D.interfacing
正确答案：D
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第14题：
Which two statements describe the operation of the CSMA/CD access method, which is in use on the Ezonexam network? (Choose two)
A. After a collision, the station that detected the collision has first priority to resend the lost data.
B. In a CSMA/CD collision domain, stations must wait until the media is not in use before transmitting.
C. In a CSMA/CD collision domain, multiple stations can successfully transmit data simultaneously.
D. The use of hubs to enlarge the size of collision domains is one way to improve the operation of the CSMA/CD access method.
E. After a collision, all stations run a random backoff algorithm. When the backoff delay period has expired, all stations have equal priority to transmit data.
F. After a collision, all stations involved run an identical backoff algorithm and then synchronize with each other prior to transmitting data.
正确答案：BE
B,E 解析：Explanation:
Ethernet networking uses Carrier Sense Multiple Access with Collision Detect (CSMA/CD), a protocol that helps devices share the bandwidth evenly without having two devices transmit at the same time on the network medium. CSMA/CD was created to overcome the problem of those collisions that occur when packets are transmitted simultaneously from different nodes. And trust me, good collision management is crucial, because when a node transmits in a CSMA/CD network, all the other nodes on the network receive and examine that transmission.
Only bridges and routers can effectively prevent a transmission from propagating throughout the entire network! So, how does the CSMA/CD protocol work? Like this: when a host wants to transmit over the network, it first checks for the presence of a digital signal on the wire. If all is clear (no other host is transmitting), the host will then proceed with its transmission.
But it doesn't stop there. The transmitting host constantly monitors the wire to make sure no other hosts begin transmitting. If the host detects another signal on the wire, it sends out an extended jam signal that causes all nodes on the segment to stop sending data (think, busy signal). The nodes respond to that jam signal by waiting a while before attempting to transmit again. Backoff algorithms determine when the colliding stations can retransmit. If collisions keep occurring after 15 tries, the nodes attempting to transmit will then time out.
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第15题：
In order to improve the performance of a network server, you need to select bus or local bus. The appropriate local bus is(69).
A．VESA
B．ISA
C．EISA
D．PCI
正确答案：D
解析：译文：为了改善网络服务器的性能，需要选择总线或者本地总线。合适的本地总线是：PCI。 -
第16题：
He got up so late that he missed the school bus．（改为同义句）
He got up________ late________ ________the school bus．
正确答案：
39． too;to catch -
第17题：
CSMA, although more efficient than ALOHA or slotted ALOHA, still has one glaring inefficiency. If the medium is busy, the station will wait for a random amount of time. When two frames collide, the medium remains （ ） for the duration of transmission of both damaged frames. The use of random delays reduces the probability of（ ）. For（ ）frames, compared to propagation time, the amount of wasted capacity can be considerable. This waste can be reduced if a station continues to listen to the medium while（ ）.The maximum utilization depends on the length of the frame and on the（请作答此空） time; the longer the frames or the shorter the propagation time，the higher the utilization.A.propagation
B.transmission
C.colliding
D.listening答案：A解析：尽管CSMA的效率远远大于ALOHA或时隙ALOHA，但它依然存在一个显著低效率的情况。当信道繁忙的时候，站点需要等待一段随机时间。当两个帧发生冲突时，在两个被破坏帧的传输持续时间内，信道仍然无法使用。使用随机时延会降低冲突的可能性。但如果帧的长度相对于传播时间来说很长，那么容量的浪费也是非常可观的。如果站点在传输时还继续监听信道，就能减少这种浪费。最大利用率与帧长和传播时间有关，帧越长或者传播时间越短，利用率就越高。 -
第18题：
Both bus and tree topologies are characterized by the use of multipoint (1).For the bus, all stations attach, through appropriate hardware (2) known as a tap, directly to a linear transmission medium, or bus. Full-duplex operation between the station and the tap allows data to be transmitted onto the bus and received from the(3). A transmission from any station propagates the length of the medium in both directions and can be received by all other (4). At each end of the bus is a (5) , which absorbs any signal, removing it from the bus. 空白（4）处应选择（）
- A、routers
- B、stations
- C、servers
- D、switches
正确答案:B -
第19题：
The customer brings their mini-tower and a new DVD/RW drive they want installed. The technician finds a second hard drive in an empty 5.25 bay connected to the secondary bus and jumpered as a slave. The ribbon cable will not stretch from the primary hard drive to the open 5.25 inch bay. Which of the following is the BEST solution?（）
- A、Connect the new DVD drive as the primary on the secondary bus and leave the old CD drive disconnected.
- B、Move the secondary hard drive next to the primary hard drive and connect to the primary bus. Connect the new DVD drive as the slave on the secondary bus.
- C、Move the secondary hard drive from the secondary to the primary bus and then reformat the hard drive after rebooting then reassign the drive letters in disk management prior to installing the new DVD drive on the secondary bus.
- D、Move the secondary hard drive to the bay and then connect it to the primary bus. Connect themini-tower and the new DVD drive as the master on the secondary bus.
正确答案:B -
第20题：
What are the two parallel SCSI specifications？（）
- A、 Up to 25 m bus length
- B、 Only one device per SCSI bus
- C、 Up to 16 devices per SCSI bus
- D、 Half-duplex operation
- E、 Full-duplex operation
正确答案:A,C -
第21题：
All client computers in your company run Windows 7 Enterprise. Each client computer runs one guest virtual machine (VM) in Windows Virtual PC . A user reports that a supported USB device connected to his client computer does not appear in the guest VM. The USB device functions correctly on the client computer. You need to ensure that the USB device can be installed in the guest VM. What should you do?（）
- A、Use Virtual PC Manager to attach the USB device on the host.
- B、Run the Add Hardware Wizard in the guest.
- C、Use the Computer Management console to scan for hardware changes in the guest.
- D、Use the Computer Management console to update the USB Virtualization Bus driver on the host.
正确答案:A -
第22题：
Which of the following hardware components is necessary for a server to access data directly on afiber channel based SAN？（）
- A、Gigabit NIC
- B、RAID controller card
- C、SATA controller card
- D、Host bus adapter
正确答案:D -
第23题：
多选题SCSI interfaces provide for faster data transmission rates (up to 80 megabytes per second) than standard serial and parallel ports. In addition, you can attach many devices to a single SCSI port, so that SCSI is really an I/O bus rather than simply an interface Which two statements about SCSI are true?（）AThe bus is limited to 64 devices.
BIt is a full-duplex serial standard.
CIt is a half-duplex serial standard.
DIt allows up to 320 MB/s of shared channel bandwidth.
正确答案： B,C解析： 暂无解析 -
第24题：
单选题An on-premise application is exposed to external users through a Windows Communication Framework （WCF） service endpoint registered in the Windows Azure AppFabric Service Bus. You need to recommend an approach for providing transport-level security that maximizes performance and minimizes bandwidth requirements. What should you recommend？（）AUse reliable messaging. Use HTTP for message delivery.
BUse binary message encoding. Use TCP for message delivery.
CUse Plain Old XML （POX） messages. Use TCP for message delivery.
DUse Message Transmission Optimization Mechanism （MTOM） message encoding. Use HTTPS formessage delivery
正确答案： D解析： 暂无解析