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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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考题
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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 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
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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.
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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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