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1、在網(wǎng)絡(luò)系統(tǒng)設(shè)計時，不可能使所有設(shè)計目標(biāo)都能達(dá)到最優(yōu)，下列措施中較為合理的是( )。

A.盡量讓最低建設(shè)成本目標(biāo)達(dá)到最優(yōu)

B.盡量讓最短的故障時間目標(biāo)達(dá)到最優(yōu)

C.盡量讓最大的安全性目標(biāo)達(dá)到最優(yōu)

D.盡量讓優(yōu)先級較高的目標(biāo)達(dá)到最優(yōu)

信管網(wǎng)參考答案：D

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2、在結(jié)構(gòu)化布線系統(tǒng)設(shè)計時，配線間到工作區(qū)信息插座的雙絞線最大不超過90米，信息插座到終端電腦網(wǎng)卡的雙絞線最大不超過( )米。

A.90

B.60

C.30

D.10

信管網(wǎng)參考答案：D

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3、下列關(guān)于項目收尾的說法中錯誤的是( )。

A.項目收尾應(yīng)收到客戶或買方的正式驗收確認(rèn)文件

B.項目收尾包括管理收尾和技術(shù)收尾

C.項目收尾應(yīng)向客戶或買方交付最終產(chǎn)品、項目成果、竣工文檔等

D.合同種植是項目收尾得一種特殊情況

信管網(wǎng)參考答案：B

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4、 Network Addres Translation(NAT) is an Internet standard that enbles a local-area network to use one set of IP addresses for internet traffic and another set of (1) IP addresses for external traffic. The main use of NAT is to limit the number of public IP addresses that an organization or company must use, for both economy and (2) purposes. NAT remaps an IP address space into another by modifying network address information in the (3) header of packets while they are in transit across a traffic routing device. It has become an essential tool in conserving global address space in the face of (4) address exhaustion. When a packet traverses outside the local network, NAT converts the private IP address to a public IP address. If NAT runs out of public addresses，the packets will be dropped and (5)"host unreachable"packets will be sent.

(1) A. local

B. private

C. public

D. dynamic

(2) A. political

B. fairness

C. efficiency

D. security

(3) A.MAC

B. IP

C.TCP

D. UDP

(4) A. IPv4

B. IPv6

C. MAC

D. logical

(5) A. BGP

B. IGMP

C. ICMP

D. SNMP

信管網(wǎng)參考答案：C、D、B、A、C

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