信管网参考答案：A
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64、进行项目风险评估最关键的时间点是（ ）。
A.计划阶段
B.计划发布后
C.设计阶段
D.项目出现问题时
信管网参考答案：A
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65、TheAddress Resolution Protocol(ARP)wasDeveloped to enableCommunication onAn InternetworkAnd performA required function in IP routing.ARP liesBetween layers（ ）of the OSI model,andAllowsComputers to introduce each otherAcrossA network prior toCommunication.APR finds the（ ）address ofA host from its known（ ）address.BeforeADevice sendsADatagram toAnotherDevice,it looks in itsARPCache to see if there isA MACAddressAndCorresponding IPAddress for theDestinationDevice.If there is no entry,the soureeDevice sendsA（ ）message to everyDevice on the network.EachDeviceCompares the IPAddress to its own.Only theDevice with the matching IPAddress replies withA packetContaining the MACAddress for theDevice（except in theCase of “proxyARP”）.The sourceDeviceAdds the（ ）device MACAddress to itsARP table for future reference.
1）A.1And 2
B.2And 3
C.3And 4
D.4And 5
2）A.IP
B.logical
C.hardware
D.network
3）A.IP
B.physical
C.MAC
D.virtual
4）A.unicast
B.multicast
C.broadcast
D.point-to-point
5）A.source
B.destination
C.gateway
D.proxy
信管网参考答案：B 、C 、A 、C 、B
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