问题：
[单选题]● A (75) system placed between the company network and the outside world may limit outside access to the internal network.(75)
A、firewall
B、modem
C、gateway
D、key
参考答案：
A
相关内容
- ● The firewall device i a( )ytem for connecting a computer network to other computer network．
- ● ●The firewall device i a（75）ytem for connecting a computer network to other computer network.（75）
- ● ● A (75) ytem placed between the company network and the outide world may limit outide acce to the internal network.(75)
- ● ●The Simple Network Management Protocol (SNMP)i an (71) protocol that facilitate the exchange of management information between (72) ．It i part of the Tranmiion Control Protocol/Internet Protocol(TCP/IP) protocol uite．SNMP enable network (73) to manage network performance, find and ole network problem,and plan for (74) ．An SNMP-managed network conit of three key component:managed device , (75) ,and network-management ytem ．Phyical LayerLink LayerNetwork LayerTranport Layer(72)
- ● The Simple Network Management Protocol(SNMP)i an(66)protocol that facilitate the exchange of management information between(67). It i part of the Tranmiion Control Protocol/Internet Protocol(TCP/IP)protocol uite. SNMP enable network(68)to manage network performance, find and ole network problem, and plan for(69)An SNMP -managed network conit of three key component: managed device ,(70),and network -management ytem .
- ● 根据下面的文字资料回答 71～75 题 The Simple Network Management Protocol(SNMP)i an （ 1 ）protocol that facilitate the exchange of management information between （ 2 ）．It i part of the Tranmiion Control ProtocoL/Internet Protocol(TCP/IP)protocol uite. SNMP enable network（ 3 ）to manage network performance，find and ole network problem，and plan for（ 4 ）．An SNMP managed network conit of three key component：managed device，（ 5 ），and networkmanagement ytem．第6题：文中（ 1 ）处正确的答案是（ ）。
- ● The ue of network（ ）,ytem that effectively iolate an organization&39; internal network tructure from an（ ）network, uch a the INTERNET i becoming increaingly popular. Thee firewall ytem typically act a application-layer（ ）between network, uually offering controlled TELNET, FTP, and SMTP acce. With the emergence of more ophiticated（ ）layer protocol deigned to facilitate global information dicovery , there exit a need to provide a general （ ）for thee protocol to tranparently and ecurely travere a firewall.
- ● A brand new network application i required for the Acme Company, and they are conidering the ue of a connectionle ervice. What are the characteritic of a connectionle ervice?（）
- ● In the open ytem interconnection (OSI) reference model, "layer" mean one of even conceptually complete,(71) arranged group of ervice, function, and protocol, that extend acro all open ytem.Application layer provide mean for the application(72) to acce the OSI environment. Preentation layer provide for the election of a common yntax for repreenting data.(73) layer provide the mean neceary for cooperating preentation entitie to organize and ynchronize their dialog and to manage their data exchange. Tranport layer provide a reliable end-to-end data tranfer ervice. Network layer provide for the entitie in the tranport layer the mean for tranferring block of data, by(74) and witching through the network between the open ytem in which thoe entitie reide. Data link layer provide ervice to tranfer data between network layer entitie. Phyical layer provide the mechanical, electrical, functional, and procedural mean to etablih, maintain and(75) phyical connection for tranfer of bit over a tranmiion medium.
- ● ●The (75)i deigned pecifically a a ecurity ytem for preventing unauthorized communication between one computer network and another computer network.
- ● ●The (75) ha everal major component，including the ytem kernel,a memory management ytem,the file ytem manager,device driver，and the ytem librarie.
- ● Feedback refer to any information which provide a report on the reult of communication which take place not only between the litener and the peaker.（）
