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单选题
The time interval between the transmission of signals from a pair of Loran-C stations is very closely controlled and operates with（）.
A
An atomic time standard
B
Daylight Savings Time
C
Eastern Standard Time
D
Greenwich Mean Time
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Telecommunications stand for devices and systems that transmit electronic or optical signals across long distances. Telecommunications enables people around the world to contact one another, to access information instantly, and to communicate from remote areas. Telecommunications usually involves a sender of information and one or more recipients linked by a technology, such as a telephone system, that transmits information from one place to another. Telecommunications enables people to sand and receive personal messages across town, between countries, and to and from outer space. It also provides the key medium for delivering news, data, information, and entertainment.Telecommunications devices convert different types of information, such as sound and video, into electronic or optical signals. Electronic signals typically travel along a medium such as copper wire or are carried over the air as radio waves. Optical signals typically travel along a medium such as strands of glass fibers. When a signal reaches its destination, the device on the receiving end converts the signal back into an understandable message, such as sound over a telephone, moving images on a television, or words and pictures on a computer screen.Telecommunications messages can be sent in a variety of ways and by a wide range of devices. The messages can be seat from one sender to a single receiver (point-to-point) or from one sender to many receivers (point-to-multipoint). Personal communications, such as a telephone conversation between two people or a facsimile (fax) message (see Facsimile Transmission), usually involve point-to-point transmission. Point-to-multipoint telecommunications, often called broadcasts, provide the basis for commercial radio and television programming.Telecommunications begin with messages that are converted into electronic or optical signals. Some signals, such as those that carry voice or music, are created in an analog or wave format, but may be converted into a digital or mathematical format for faster and more efficient transmission. The signals are then sent over a medium to a receiver, where they are decoded back into a form. that the person receiving the message can understand. There are a variety of ways to create and decode signals, and many different ways to transmit signals.Individual people, businesses, and governments use many different types of telecommunications systems. Some systems, such as the telephone system, use a network of cables, wires, and switching stations for point-to-point communication. Other systems, such as radio and television, broadcast radio signals over the air that can be received by anyone who has a device to receive them. Some systems make use of several types of media to complete a transmission. For example, a telephone call may travel by means of copper wire, fiber-optic cable, and radio waves as the call is sent from sender to receiver. All telecommunications systems are constantly evolving as telecommunications technology improves. Many recent improvements, for example, offer high-speed broadband connections that are needed to send multimedia information over the Internet.Personal computers have pushed the limits of the telephone system as more and more complex computer messages are being sent over telephone lines, and at rapidly increasing speeds. This need for speed has encouraged the development of digital transmission technology. The growing use of personal computers for telecommunications has increased the need for innovations in fiber-optic technology.Telecommunications and information technologies are merging and converging. This means that many of the devices now associated with only one function may evolve into more versatile equipment. This convergence is already happening in various fields. Some telephones and pagers are able to store not only phone numbers but also names and personal information aboA．Current development.B．Transmission of message.C．Computer networking.D．Government regulation.
考题
As can be gathered from the passage, before 1910 the normal running time of a film was probably ______.A．15 minutes or lessB．between 15 and 30 minutesC．between 30 and 45 minutesD．1 hour or more
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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．mediumB．connectionC．tokenD．resource
考题
The time interval between the transmission of signals from a pair of Loran-C stations is very closely controlled and operates with ______．A.An atomic time standardB.Daylight Savings TimeC.Eastern Standard TimeD.Greenwich Mean Time
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When monitoring a system using /usr/bin/vmstat with an interval， the metrics under page pi and page po represent which of the following phrases？（）A、 The pages to and from paging space per secondB、 The page intervals and page operations per secondC、 The page interrupts and page operations per secondD、 The page segments transferred between pi and po devices per second
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考题
When deployed to transmission application of wavelengths up to 160 wavelengths, the ZXWM M900 performs optical amplification of signals at the C band and the L band independently at the same time.
考题
What are two characteristics of dual-ring interconnect in SDH networks？ （）A、 It protects signals against node failures between rings.B、 It protects signals against node failure within a single ring.C、 It allows for traffic to be preempted when a ring switch occurs.D、 Traffic can be dropped and continued at interconnecting nodes.E、 It protects preemptible traffic from being dropped when a ring switch occurs.
考题
You have just completed an OSPF implementation. While executing your verification plan, you determine that R1 is not able to establish full OSPF adjacency with R2. The show ip ospf neighbor comman d output on R1 shows that R2 is stuck in the INIT state. What could be the cause of this problem?（）A、DR and BDR election errors between R1 and R2.B、The R2 router has not received the OSPF hello packets from the R1 router.C、Mismatched interface ma ximum transmission unit (MTU) configuration between the R1 and R2.D、Mismatched OSPF hello interval configuration between the R1 and R2E、Corrupted LSAs exchanges between the R1 and R2.
考题
What is the difference between a CSU/DSU and a modem?（）A、A CSU/DSU converts analog signals from a router to a leased line; a modem converts analog signals from a router to a leased lineB、A CSU/DSU converts analog signals from a router to a phone line; a modem converts digital signals from a router to a leased lineC、A CSU/DSU converts digital signals from a router to a phone line; a modem converts analog signals from a router to a phone lineD、A CSU/DSU converts digital signals from a router to a leased line; a modem converts digital signals from a router to a phone line
考题
What is the difference between a CSU/DSU and a modem?（）A、A CSU/DSU converts analog signals from a router to a leased line; a modem converts analog signals from a router to a leased line.B、A CSU/DSU converts analog signals from a router to a phone line; a modem converts digital signals from a router to a leased line.C、A CSU/DSU converts digital signals from a router to a phone line; a modem converts analog signals from a router to a phone line.D、A CSU/DSU converts digital signals from a router to a leased line; a modem converts digital signals from a router to a phone line.
考题
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、mediumB、connectionC、tokenD、resource
考题
Which of the following is the definition of CAS latency？（）A、 CAS latency is the ratio between the column access time and the clock cycle time.B、 CAS latency is the ratio between the row access time and the clock cycle time.C、 CAS latency is the ratio between the column access time and the data burst transfer time.D、 CAS latency is the ratio between the row access time and the data burst transfer time.
考题
Your network contains a domain controller that is configured as a DNS server. The server hosts an Active Directory-integrated zone for the domain. You need to reduce how long it takes until stale records are deleted from the zone. What should you do（）A、From the configuration directory partition of the forest， modify the tombstone lifetime.B、From the configuration directory partition of the forest， modify the garbage collection interval.C、From the aging properties of the zone， modify the no-refresh interval and the refresh interval.D、From the start of authority （SOA） record of the zone， modify the refresh interval and the expire interval.
考题
Your network contains a domain controller that is configured as a DNS server. The server hosts an Active Directory-integrated zone for the domain. You need to reduce how long it takes until stale records are deleted from the zone. What should you do？（）A、From the configuration directory partition of the forest， modify the tombstone lifetime.B、From the configuration directory partition of the forest， modify the garbage collection intervalC、From the aging properties of the zone， modify the no-refresh interval and the refresh intervalD、From the start of authority （SOA） record of the zone， modify the refresh interval and the expire interval
考题
单选题The radiotelegraph alarm signal is（）.A
SOS sent three timesB
ten one-second dashes with a four-second interval between themC
twelve four-second dashes with a one-second interval between themD
twelve one-second dashes with a short interval between them
考题
单选题If no distress acknowledgement is received（）a DSC distress call transmission, then the ship in distress may repeat the DSC distress call attempt after a delay of between 3.5 and 4.5 minutes from the beginning of the initial call.A
relevant toB
relate toC
in response toD
in relation to
考题
单选题The interval of the average elapsed time from the meridian transit of the moon until the next high tide is called the（）.A
harmonic constantB
establishment of the portC
half-tide levelD
tide cycle
考题
多选题What are two characteristics of dual-ring interconnect in SONET networks? （）(Choose two.)AIt protects signals against node failures between rings.BIt protects signals against node failure within a single ring.CIt allows for traffic to be preempted when a ring switch occurs.DTraffic can be dropped and continued at interconnecting nodes.EIt protects preemptible traffic from being dropped when a ring switch occurs.
考题
单选题What is the difference between a CSU/DSU and a modem?（）A
A CSU/DSU converts analog signals from a router to a leased line; a modem converts analog signals from a router to a leased lineB
A CSU/DSU converts analog signals from a router to a phone line; a modem converts digital signals from a router to a leased lineC
A CSU/DSU converts digital signals from a router to a phone line; a modem converts analog signals from a router to a phone lineD
A CSU/DSU converts digital signals from a router to a leased line; a modem converts digital signals from a router to a phone line
考题
单选题Which of the following is the definition of CAS latency？（）A
CAS latency is the ratio between the column access time and the clock cycle time.B
CAS latency is the ratio between the row access time and the clock cycle time.C
CAS latency is the ratio between the column access time and the data burst transfer time.D
CAS latency is the ratio between the row access time and the data burst transfer time.
考题
多选题Which two Aironet enterprise solution statements are true？（）AA Cisco Aironet AP handles the transmission of beacon frames and also handles responses to probe-request frames from clientsBA Cisco Aironet solution includes intelligent Cisco Aironet access points （APs） and Cisco Catalyst switchesCIn the Cisco Aironet solution， each AP is locally configured by the use of either a web interface or the command line interfaceDThe Cisco Aironet AP handles real-time portions of the LWAPP protocol， and the WLAN controller handles those items which are not time sensitiveEVirtual MAC architecture allows the splitting of the 802.11 protocol between the Cisco Aironet AP and a LAN switch
考题
单选题The time interval between the transmission of signals from a pair of Loran-C stations is very closely controlled and operates with（）.A
An atomic time standardB
Daylight Savings TimeC
Eastern Standard TimeD
Greenwich Mean Time
考题
单选题A radio determination system based on the comparison of reference signals with radio signals reflected,or retransmitted from the position to be determined,is（）.A
DFB
Radar SystemC
DSC SystemD
COSPAS-SARSAT
考题
单选题What is the purpose of the RSVP hello interval?（）A
It is the size of the RSVP hello packetB
It is how long it maintains RSVP neighborsC
It is the length of time between RSVP hello packetsD
It is how long the router waits before declaring a router to be down
考题
单选题What is the difference between a CSU/DSU and a modem？（）A
A CSU/DSU converts analog signals from a router to a leased line; a modem converts analog signals from a router to a leased line.B
A CSU/DSU converts analog signals from a router to a phone line; a modem converts digital signals from a router to a leased line.C
A CSU/DSU converts digital signals from a router to a phone line; a modem converts analog signals from a router to a phone line.D
A CSU/DSU converts digital signals from a router to a leased line; a modem converts digital signals from a router to a phone line.
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