第53題： 采用DHCP動態(tài)分配IP地址，如果某主機開機后沒有得到DHCP服務(wù)器的響應(yīng)。則該主機獲取的IP地址屬于網(wǎng)絡(luò)（  ）。
A.202.117.0.0/24
B.192.168.1.0/24
C.172.16.0.0/16
D.169.254.0.0/16
答案解析與討論：m.tent-cn.com/st/4513828950.html

第54題： 在瀏覽器的地址欄中輸入xxxyftp.abc.can.cn，在該URL中（ ）是要訪問的主機名。
A.xxxftp
B.abc
C.can
D.cn
答案解析與討論：m.tent-cn.com/st/451391607.html

第55題： 當修改郵件時，客戶與POP3服務(wù)器之間通過（  ）建立連接，所使用的端口是（  ）。
1)A.HTTP
B.TCP
C.UDP
D.HTTPS
2)A.52
B.25
C.1100
D.110
答案解析與討論：m.tent-cn.com/st/4514016691.html

第57題： Regardless of how wellDesigned,Constructed,And testedA system orApplication mayBe, errors orBugs will inevitably occur. OnceA system hasBeen（  ），it enters operationsAnd support.
Systems support is the ongoing technical support for user,As wellAs the maintenance required to fixAny errors, omissions,or new requirements that mayArise.BeforeAn information systemCanBe（  ）, it mustBe in operation. System operation is theDay-to-day, week-to-week, month-to-month,And year-t-year（  ）ofAn information system'sBusiness processesAndApplication programs.
Unlike systemsAnalysis,Design,And implementation, systems supportCannot sensiblyBe（  ）intoActual phases thatA support project must perform. Rather, systems supportConsists of four ongoingActivities thatAre program maintenance, system recovery, technical support,And system enhancement.EachActivity isA type of support project that is（  ）byA particular problem,event, or opportunity encountered with the implemented system.
1)A.designed
B.implemented
C.investigated
D.analyzed
2)A.supported
B.tested
C.implemented
D.constructed
3)A.construction
B.maintenance
C.execution
D.implementation
4)A.broke
B.formed
C.composed
D.decomposed
5)A.triggered
B.leaded
C.caused
D.produced
答案解析與討論：m.tent-cn.com/st/4514216784.html