(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

                   第2套

     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

                第3套

     (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

                    第4套

     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