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在千兆以太网标准中，采用屏蔽双绞线作为传输介质的是( )，使用长波1330nm光纤的是( )。(1)A.1000BASE-SXB.1000BASE-LXC.1000BASE-CXD.1000BASE-T(2)A.1000BASE-SXB.1000BASE-LXC.1000BASE-CXD.1000BASE-T

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64、 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 ( ) 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 ( ) purposes. NAT remaps an IP address space into another by modifying network address information in the ( ) 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 ( ) 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 ( )"host unreachable"packets will be sent.(1) A. localB. privateC. publicD. dynamic(2) A. politicalB. fairnessC. efficiencyD. security(3) A.MACB. IPC.TCPD. UDP(4) A. IPv4B. IPv6C. MACD. logical(5) A. BGPB. IGMPC. ICMPD. SNMP

简述迈克尔逊干涉仪的组成及工作原理。

常见的红外光源主要有哪些？

简要说明红外光谱仪的日常维护。