[解析] 网络的划分方法有很多种。按照网络的分布范围可以划分为广域网(Wide Area Network,WAN)、局域网(Local Area Network,LAN)和城域网(Metropolitan Area Network,MAN)。 广域网也称为远程网,它的覆盖范围可从几百公里到几千公里,可以覆盖一个地区或一个国家,甚至整个世界。因为距离较远,信息衰减比较严重,所以这种网络一般需要租用专线:由于其规模较大,传输延迟也较大。 局域网是最常见、应用最广的一种网络。它的覆盖范围在几十米或数公里,限定在较小的区域内。 城域网也称市域网,覆盖范围一般是一个城市,介于局域网和广域网之间。它的覆盖范围在几十公里至数百公里,采用IEEE802.6标准。 故本题选B
93. Recently,telecommunication carriers has been building______core networks in order to effectively support various kinds of fixed and mobile broadband services.
A.NGN
B.social network
C.mobile network
D.All -IP
A B C D
A
94. When we use VoIP service,the voice packets over the Internet arrive at their destination in a______ stream.
A.burst
B.delayed
C.interrupted
D.continuous
A B C D
D
95. 4G is the fourth generation wireless technology adopted by the______and carriers around the world.
A.ISO
B.IEEE
C.ITU
D.IETF
A B C D
C
96. SMS was originally designed as part of______,but is now available on a wide range of networks,including 3G and 4G networks.
A.PHS
B.AMPS
C.GSM
D.GPRS
A B C D
C
97. ______was frozen in December 2008 and this has been the basis for the first wave of LTE equipment.LTE specifications are very stable,with and added benefit of enhancements having been introduced in all subsequent 3GPP Releases.
A.Release 1
B.Release 8
C.Release 10
D.Release 15
A B C D
B
[The Internet of things(IoT)is the inter-networking of physical devices,vehicles,buildings,and other items embedded with electronics,software,sensors,actuators,and network connectivity which enable these objects to collect and exchange data. In 2013 the Global Standards Initiative on Internet of Things(IoT-GSI)defined the IoT as “a global infrastructure for the information society, enabling advanced services by interconnecting(physical and virtual) things based on existing and evolving interoperable information and communication technologies” and for these purposes a “thing” is “an object of the physical world(physical things)or the information world(virtual things). which is capable of being identified and integrated into communication networks”. The IoT allows objects to be sensed or controlled remotely across existing network infrastructure ,creating opportunities for more direct integration of the physical world into computer - based systems,and resulting in improved efficiency. Accuracy and economic benefit in addition to reduced human intervention. When IoT is augmented with sensors and actuators,the technology becomes an instance of the more general class of cyber physical systems,which also encompasses technologies such as smart grids,virtual power plants ,smart homes ,intelligent transportation and smart cities. Each thing is uniquely identifiable through its embedded computing system but is able to interoperate within the existing Internet infrastructure. Experts estimate that the IoT will consist of about 30 billion objects by 2020.] 1.Based on the paragraph above,we know that the applications of the IoT include ______. RFID 2.technology makes it possible to automatically ______ every object on the Internet of things,and is 3.the foundation of networking. From the industry point of view,IoT is mainly involved in industries including ______.