D、高速度、长距离、高成本、细芯线 (20)A、TDMB、FDMC、WDMD、ATDM 答案: AABDC 5、向端用户提供尽可能宽带的网络接入是引起人们广泛关注的技术。(21)只能提供128kbis 的接入数据速率,(22)则是通过电话双绞线向端用户提供更高信息传输带宽的一种接入技 术,而采用(23)和电缆调制解调器也可获得和后者同样数量级的接入带宽。第3代无线通 信的(24)可提供高达2 Mbit/s的接入数据速率。光纤到户,即(25),则是将来的一种发 展方向 (21)A、B- ISDN B、N一ISDN C、CDMA D、ADSL (22)A、B- ISDN B、N一ISDN C、CDMA D、ADSL (23)A、GSM B、HFC C、CDMA D、HDSL (24)A、HFC B、GSM C、CDMA D、HDSL (25)A、FDDI B、FTTH C、FTTC D、FTTB 答案: BDBCB 6、IPV4地址可以划分为(网络号,主机号)两部分,在下面的地址标记中,用0表示所有 比特为0,用一1表示所有比特为1。以下选项中,(26)不能作为目标地址,(27)不能作 为源地址,(28)只能用于本机测试,(29)只能用于内部网络。IPV6使用了更大的地址空 间,每个地址占有128比特,为方便网络管理人员阅读和管理。采用(30)进制加冒号的表 示方法 (26)A、{0,0}B、(127,主机号}C、{10,主机号 D、{网络号,-1 (27)A、{0,0}B、{127,主机号}C、{10,主机号 D、{网络号,-1} (28)A、{0,0}B、{127,主机号}C、{10,主机号 D、{192,-1} (29)A、{0,0}B、{128,主机号}C、{10,主机号 D、{168,-1} (30)A、十六B、十 答案: BDBCA 7, IPV6 is(31)for Internet Protocol Version 6.IPv6 is the"next generation"protocol designed by the IETF to(32)the current version Internet Protocol, IPVersion 4(IPv4") Most of today's internet uses IPv4, which is now nearly twenty years old. IPv4 has been remarkably resilient in spite of its age, but it is beginning to have problems. Most importantly, there is a growing(33)of IPv4 addresses, which are needed by all new machines added to the Internet IPv6 fixes a number of problems in IPv4, such as the (34 )number of available. IPv4addreses it also adds many improvements to IPv4 in areas such as routing and network autoconfiguration. IPv6 expected to gradually replace IPv4, with the two coexisting for a number of years during transition(35) (31)A、 short E、 abbreviate C、 abbreviation D、 initial (32)A、 substitution B、 replace 、 switchover D、swap ge (34)A、 restrict C、 confine D、 ImprIson B、 period C、pl 答案: ABDBB 8, in the following essay, each blank has four choices. Choose the best answer and write down on the anser sheet Spread spectrum simply means that data is sent in small pieces over a number of theD、高速度、长距离、高成本、细芯线 （20）A、TDM B、FDM C、WDM D、ATDM 答案：AABDC 5、向端用户提供尽可能宽带的网络接入是引起人们广泛关注的技术。（21）只能提供 128kbit/s 的接入数据速率，（22）则是通过电话双绞线向端用户提供更高信息传输带宽的一种接入技 术，而采用（23）和电缆调制解调器也可获得和后者同样数量级的接入带宽。第 3 代无线通 信的（24）可提供高达 2Mbit/s 的接入数据速率。光纤到户，即（25），则是将来的一种发 展方向 （21）A、B－ISDN B、N－ISDN C、CDMA D、ADSL （22）A、B－ISDN B、N－ISDN C、CDMA D、ADSL （23）A、GSM B、HFC C、CDMA D、HDSL （24）A、HFC B、GSM C、CDMA D、HDSL （25）A、FDDI B、FTTH C、FTTC D、FTTB 答案：BDBCB 6、IPV4 地址可以划分为（网络号，主机号）两部分，在下面的地址标记中，用 0 表示所有 比特为 0，用－1 表示所有比特为 1。以下选项中，（26）不能作为目标地址，（27）不能作 为源地址，（28）只能用于本机测试，（29）只能用于内部网络。IPV6 使用了更大的地址空 间，每个地址占有 128 比特，为方便网络管理人员阅读和管理。采用（30）进制加冒号的表 示方法。 （26）A、｛0，0｝ B、｛127，主机号｝ C、｛10，主机号｝ D、｛网络号，-1｝ （27）A、｛0，0｝ B、｛127，主机号｝ C、｛10，主机号｝ D、｛网络号，-1｝ （28）A、｛0，0｝ B、｛127，主机号｝ C、｛10，主机号｝ D、｛192，-1｝ （29）A、｛0，0｝ B、｛128，主机号｝ C、｛10，主机号｝ D、｛168，-1｝ （30）A、十六 B、十 C、八 D、二 答案：BDBCA 7、IPV6 is (31)for ”Internet Protocol Version 6”.IPv6 is the “next generation”protocol designed by the IETF to (32) the current version Internet Protocol,IPVersion 4(“IPv4”). Most of today’s internet uses IPv4,which is now nearly twenty years old.IPv4 has been remarkably resilient in spite of its age ,but it is beginning to have problems .Most importantly, there is a growing (33)of IPv4 addresses, which are needed by all new machines added to the internet. IPv6 fixes a number of problems in IPv4,such as the (34)number of available. IPv4addreses.it also adds many improvements to IPv4 in areas such as routing and network autoconfiguration. IPv6 is expected to gradually replace IPv4,with the two coexisting for a number of years during a transition(35). (31)A、 short B、abbreviate C、abbreviation D、initial (32)A、substitution B、replace C、switchover D、swap (33)A、scarcity B、lack C、deficiency D、shortage (34)A、restrict B、limited C、confine D、imprison (35)A、days B、period C、phase D、epoch 答案：ABDBB 8、in the following essay,each blank has four choices.Choose the best answer and write down on the anser sheet . Spread spectrum simply means that data is sent in small pieces over a number of the