软考网络工程师资料-网工英语10套练
更新时间:2024-03-03 21:10:01 阅读量: 综合文库 文档下载
网工英语10套练习题
ISDN,which stands for Integrated Services Digital Network, is a
system of digital phone connections, which has been available for
over a decade.This system allows data to be transmitted
simultaneously across the world using (1) digital connectivity.With
ISDN,voice and data are carried by bearer channels occupying a
bandwith of (2) (bits per second).Some switches limit B channels to
capacity of 56 Kbps.A data channel (3) handles signaling at 16Kbps
or 64Kbps,depending on (4) .Note that,in ISDN terminology,”k”
means (5),and not 1024(2^10) as in many computer
applications;therefore,a 64Kbps channel carries data at a rate of
64000bps. A new set of standard prefixes has recently been created
to handle this. Under this scheme,”K”(Kilo) means 1000(10^3),”M”
(Mega) means 1000000(10^6),and soon ,and “Ki”(Kibi) means 1024
(2^10),”Mi” (Mebi) means 1048576(2^20).and soon。
(1). A.Multi-ends B.circle C.indirect D.end-to-end (2). A.34 Kbps B. 84 Kbps C. 64 Kbps D. 54 Kbps (3). A.D channel B.A channel C.B channel D.C channel
(4). A.the method B.the number C.the service type D.the user type (5). A.100000(10^5) B.1000(10^3) C.10000(10^4) D.100(10^2)
答案:
1:D,2:C,3:A,4:C,5:B
Bluetooth is a universal radio interface in the (1) frequency band
that enables portable celectronic devices (2) connect and
communicate (3) via short range,ad hoc networks.Each unit can
simultaneously communicate with up to (4) other units per piconet.
Moreover,each unit can simultaneously (5) to several
piconets,Bluetooth technology which apart from Ericsson,has gained
the support of Nokia,IBM,Toshiba,Intel and many other
manufactures,eliminates the need for wires,cables and connectors
for and between cordless or mobile
phones,modems,headsets,PDAs,Computes,printers,progjectors,local
ares networks,and so on ,and paves the way for new and completely
different devices and applications.
(1). A.2.45GHz B. 4.45GHz C. 2.95GHz D. 3.45GHz (2). A.in B. on C. to D. with (3). A.narrowly B.wirelessly C.freely D.widely (4). A.use B.sever C.host D.base (5). A.relate B.add C.close D.belong 答案:1:A,2:C,3:B,4:B,5:D
(1)is used to ensure the confidentiality,integrity and authenticity
of the two end points in the private network .the(2),an application
layer protocol,authenticates each peer in an IPsec transaction ,IKE
negotiates security policy,determining which algorithm may be used
to set up theRunnel .It also handles the exchang of session keys
used for that one transaction.Networks that use (3)to secure data
traffic can automatically authenticate devices by using (4)
whichVerify the identities of the two users who are sending
information back and forth .IPsec can be ideal way to secure data in
large networks that require (5) connections among many devices。
(1) A.Encryption B.Code C.Certificate D. Tunnel
(2) A.associated links B.Internet Key Exchange C IPsec D. encryption (3) A authenticity B.password C.IPsec D. Internet Key Exchange (4) A.protocols B.keywords C.IKE D. digital certificates (5) A.free B.strict C.secure D.remote 答案:1:A,2:B,3:C,4:D,5:C
LAPB is a (1) protocol that provides complete data transparency in
a (2)operation. It supports a peer-to-peer link in that neither end
of the link plays the role of the permanent master station.
HDLC LAPB is the (3)that is usually used by(4), the (5)standard for
Packet Switched Networks.
(1)A.bit-oriented synchronous B.byte-oriented synchronous
C.bit-oriented asynchronous D.byte-oriented asynchronous (2)A.half-duplex point-to-point B.half-duplex point-to-points C.full-duplex point-to-point D.full-duplex point-to-points (3)A.Physical Layer B.Link Layer C.Network Layer D.Transport Layer (4)A.X.21 B.X.25 C.X.28 D.X.29
(5)A.ITU B.IEEE C.OSI D.ANSI 答案:1:A,2:C,3:B,4:B,5:A
Data communications equipment(DEC) (1) the serial data stream from
the DTE and converts it to some form of (2) suitable of
transmission on voice grade lines. At the (3),the DCE performs the
reverse function of convering the received analog signal to serial
digital data stream .The simplest form of DCE is a (4) or data set .
At the transmit end, the modem can be considered a form of (5),while
at the receive end, it can be considered a form of analog to
digital converter. The most common forms of modulation by modems are
frequency shift keying(FSK),phase shift keying(PSK) ,and quadrature
amplitude modulation(QAM). If the cables and signal levels used to
interconnect the DTE and DCE were left unregulated,the variations
generated would probably be proporation to the number of
manufactures. Electronics Industries Association(EIA) ,an
organization of manufactuuers concerned with establishing industry
standards,have agreed on the RS-232C as the standard interface
between the DTE and the modem .This is a 25 pin cable pins have
designated funtons and specified signal levels.
(1) A. accepts B.sends C.delivers D.receives (2) A. digital signal B.analog signal C.light signal D.sound signal (3) A. back end B.front end C.sending end D.receive end (4) A. modem B.cpu C.demodulator D.modulator. (5) A. host computer B.digital to analog converter C. analog to digital converter D.secondaries 答案:
1:A,2:B,3:D,4:A,5:B
In ATM,cells serve as universal units for all information
types:data,voice,video,etc,Since switches know beforehand the size
and format of each information unit sent through the network,switch
architectures can be (1),Futhermore ,since the CMS determines the
connection path during connection setup,switches do not have to make
complex routing decisions on a (2) basis.Communiciation paths can be
“hard wired” into the switch’s circuits to enable fast,simple
decisions. Hardware techniques,using VLSI based state machines
and ,in the future,optical switching techniques,can be applied to
switches.Hardware Based switch matrices take advantage of all these
(3) characteristics.The matrix approach to implementing cell
switching greatly increases the scalability of ATM based
solutions,One fundamental advantage of matrix based switches is
that,as more ports are added to the switching complex,the aggregate
switching capacity of the switch increases. In other words, as(4)
are added to a switched network, they tap into an increasing band
width pool-the complete opposite of shared media networks,where user
are forced to share smaller and smaller slices of a fixed amount of
(5).Simply put,cell switching based on ATM enables extremely
fast,massively scalable networdks.
(1) A.optimized B.increased C.decreased D.fixed (2) A.cell by cell B.object oriented C.bit-by-bit D.LAN
(3) A.VLSI B.OSI C.CMS D.ATM (4) A.cells B.switches C.users D.approaches (5) A.data B.media C.bandwidth D.information
答案:1:A,2:A,3:D,4:C,5:C
A digital wallet is (1) that enables users to pay for goods on the
web.It holds credit card numbers and other (2) such as shipping
address. Once entered, the data automatic ally populates order
fields at merchant sites. When using a digital wallet,consumers don’
t need to fill out order forms on each site when they purchase an
item because the information has already been (3) and is
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