第7套
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 automatically (4) and entered into the order fields across merchant sites.Consumers also benefit when using digital wallets because their information is (5) or protechted a private software code.And merchants benefit by receiving protection against fraud.
(1) A.software B.hardware C. device D.document
(2) A.cards B.secrets C.public information D.person information
(3) A.distributed B. stored C.addressed D.registered
(4) A.coded B.updated C.corrected D.named
(5) A.encrypted B.updated C.secured D.undiscovered
答案:1:A,2:D,3:B,4:B,5:A
第8套
The router inspecters the packet’s IP address and performs (1) lookup to see if the destination end station resides on the local (physically connected) network,typically called an IP subber (2) usually is assignted to each of the router’s network interface.If the destination IP address is local,the router searches an internal store of IP address and local-device Media Acess Control(MAC) address.This store is known as the (3) cache. Address Resolution Protocol(ARP)is the universal tool for matching IP addresses to MAC address.If the destination’s MAC address appears,the router installs that MAC address in the pachet header(removing its own MAC address because that’s no longer needed) and sends the packet to the destional end station. In the event that the destional MAC address does not appear in the ARP cache-it might have timed out,for instance-the router must broadcast an ARP request to the subnet referenced by the packet’s destional IP address.The end station with that IP address responds, sending back its MAC address. The router updates its cache,installs the new MAC address into the(4) and launches the packet. If the router table lookup shows that the packet is destined for a non local subnet,the router forwards the packet to the next-hop router using the-hop router’s MAC address.Routing tables are continuously built and rebuilt by intelligent discovery protocols,such as Routing Information Protocol or Open Shortest Path First(OSPF).Each router’ s routing table shows the best route to the destination address:for address that may be severd hops away,it shows(5) next-hop router.
(1) A. a router table B.a signal C.an e-mail D.a file
(2) A. A TCP subnet B.IP headerC. An IP subnet D.TCP/IP
(3) A.OSPF B. Address Resolution Protocol(ARP)C.MAC D.RIP
(4) A.small packet B.space C.packet header D.packet tailor
(5) A.the fewest B.the worst C.the least D.the best
答案:1:A,2:C,3:B,4:C,5:D
第9套
_(1)__ is used to ensure the confidentiality,integrity and authenticity of the two end points in the private etwork .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 the Runnel .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)__,which Verify 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10套
Ｂluetooth is a universal radio interface in the __(1)__frequency band that enables portable electronic devices __(2)__ connect and communicate __(3)__via short range,ad hoc net Works .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 th support of Nokia,IBM,Toshiba,Intel and many other manufactures,eliminates ths need for wires,cables and connectors for and between cordless or mobile phones,modems,headsets,PDAs,Computers,printers.projectors,local area 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. 1.45GHZ
(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
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