初级通信工程师考试每日一练【10、31】

备考初级通信工程师，做题是必不可少的，以下是小编为大家整理的初级通信工程师考试每日一练，更多考试相关资讯可关注希赛通信工程师频道。

1、科技工作者进行科技活动的出发点和归宿是（）。
A．造福人民、振兴祖国

B．热爱专业、忠于职责
C．实事求是、追求真理
D．勇于探索、敢于创新
2、当固定电话用户有事外出时，为及时接听电话，可登记使用（）业务。
A．呼叫等待 B．遇忙回叫
C．呼出限制 D．无条件转移
3、下列协议中，属于文件传送协议的是（）。
A、SNMP  B、UDP C、FTP  D、RIP
4、在通信专业中，MAC的英文全称是（），调制的英文通常翻译为（）。
A、Media access control  B、media access concect
C、medtiple access control  D、multiple access connect
A、adjust  B、medies
C、modulation D、modulator
5、【A popular service that has attercted the interest of companies and has home users alike is the sending of voice signals over an IP-based network,such as the Internet.The practice of making telephone calls over the internet has had a number of different names,including packet voice,voice over packet,voice over the internet,internet telephone,and Voice over Ip（Voip）.But it appears the industry has settled on the term”Voice ove IP”in reference to the internet protocol,which controls the transfer of data over the internet.There are currently three ways to deliver VoIp to users,the first technique is found at the corporate level.Many companies are offering VoIP systerms that operate over a local area network.These systems involve a fair amount of equipment,such as VoIP servers,special IP-enabled telephones,and routers that can direct telephone calls.Today a large portion of corporate sites have converted their older internal telephone systems to VoIP systems that opreate over a LAN,thus converging two systems into one.A second common solution is the one often encountered at home.Using existing telephones,a special converter is added between the telephone and a high speed internet（DSL or cable modem）connection.The converter digitizes the voice signal and creates a stream of packets that are then sent over an ip connection.The third technique involves smart cell phones.Never cell technologies are all packet-based,thus requiring a telephone call to be converted to digital packets and sending those packets over IP networks.】
From the paragraph above，a popular service that has attracetd the interest of companies and home users,is termed as（）.The data transfer over the Internet is controlled by the（）.At corporate level,many companies have replaced their older internal telephone systerms with（）that oprerate over a local area network.
A、voice over the internet
B、voice over packet
C、Voice over IP
D、internet telephony
A、packet B、internet protocol C、industry  D、VoIp servers
A、VoIP systems  B、IP-enablde telephones C、VoIP servers  D、routers
6、电信条例规定，经营基础电信业务的公司的股权结构中，国有股权或股份不得少于（）。
A．40% B．50%  C．51%  D．61%
7、能够在通信_中以较低成本迅速灵活地引人新业务的是（）技术。
A．虚拟网  B．智能网 C．移动通信  D．程控交换
8、下列业务中，能同时处理多种媒体格式信息的是（）。
A．短信  B．彩信  C．紧急呼叫  D．语音信箱
9、阅读下面的短文，回答问题
[When an IP packet arrives at a router,generally the router looks at the destination address of the packet,and forwards the packet to one of its network interfaces.The forwarding decision is usually done by looking up the destination address from another data structure called a forwarding table.The forwarding table is created by the router using the routing table and possible routing policies existing in the router.The router then creates a table where it lists which networks are accessible through which of the router’s network interfaces.An IP router looks at every IP packet individually and does the forwarding decision on a packet-by-packet basis.If something changes in the router’s routing table,a packet can take a different route from a preceding packet even if it has the same destination.]
From the paragraph above，we can see that the router（）a forwarding table according to the routing table and possible routing policies existing in the router.When an IP packet arrives at a router,the（）part of packet is normally checked by the router.An IP router checks every IP
Packet individually and makes the forwarding decision based on（）.
A．is generating  B．generate C．is generated D．generates
A．forwarding table  B．network interfaces
C．routing policies  D．destination address
A．the destination address and network interfaces
B．forwarding table and network interfaces
C．the destination address and forward table
D．routing policies and routing table
10、光纤通信的特点之一是传输频带宽，传输容量大。在零色散波长窗口，单模光纤都具有（47）吉赫•千米（GHz•km）的带宽。
A.1至2 B.几十 C.几千  D.几十万

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