首页
登录
从业资格
The File Transfer Protocol (FTP) is a st
The File Transfer Protocol (FTP) is a st
免费题库
2022-08-02
21
问题
The File Transfer Protocol (FTP) is a standard network protocol used for the transfer of computer ( ) between a client and server on a computer network.FTP is built on a ( ) model architecture using separate control and data connections between the client and the server. FTP users may authenticate themselves with a (请作答此空) sign-in protocol, normally in the form of a username and password, but can connect anonymously if the server is configured to allow it. For secure transmission that protects the username and password, and encrypts the content, FTP is often secured with SSL/TLS (FTPS) or replaced with SSH File Transfer Protocol (SFTP).The first FTP client applications were ( ) programs developed before operating systems had graphical user interfaces, and are still shipped with most Windows, Unix, and Linux operating systems. Many FTP clients and automation utilities have since been developed for desktops, servers, mobile devices, and hardware, and FTP has been incorporated into productivity applications, such as HTML editors.FTP may run in ( ) mode, which determines how the data connection is established. In both cases, the client creates a TCP control connection from a random, usually an unprivileged, port N to the FTP server command port 21.In active mode, the client starts listening for incoming data connections from the server on port M. It sends the FTP command PORT M to inform the server on which port it is listening. The server then initiates a data channel to the client from its port 20, the FTP server data port.In situations where the client is behind a firewall and unable to accept incoming TCP connections, passive mode may be used. In this mode, the client uses the control connection to send a PASV command to the server and then receives a server IP address and server port number from the server, which the client then uses to open a data connection from an arbitrary client port to the server IP address and server port number received.Both modes were updated in September 1998 to support IPv6. Further changes were introduced to the passive mode at that time, updating it to extended passive mode.A.encryptB.decryptionC.clear-textD.secure
选项
A.encrypt
B.decryption
C.clear-text
D.secure
答案
C
解析
The File Transfer Protocol (FTP) is a standard network protocol used for the transfer of computer files between a client and server on a computer network.FTP is built on a client-server model architecture using separate control and data connections between the client and the server. FTP users may authenticate themselves with a clear-text sign-in protocol, normally in the form of a username and password, but can connect anonymously if the server is configured to allow it. For secure transmission that protects the username and password, and encrypts the content, FTP is often secured with SSL/TLS (FTPS) or replaced with SSH File Transfer Protocol (SFTP).The first FTP client applications were command-line programs developed before operating systems had graphical user interfaces, and are still shipped with most Windows, Unix, and Linux operating systems. Many FTP clients and automation utilities have since been developed for desktops, servers, mobile devices, and hardware, and FTP has been incorporated into productivity applications, such as HTML editors.FTP may run in active or passive mode, which determines how the data connection is established. In both cases, the client creates a TCP control connection from a random, usually an unprivileged, port N to the FTP server command port 21.In active mode, the client starts listening for incoming data connections from the server on port M. It sends the FTP command PORT M to inform the server on which port it is listening. The server then initiates a data channel to the client from its port 20, the FTP server data port.In situations where the client is behind a firewall and unable to accept incoming TCP connections, passive mode may be used. In this mode, the client uses the control connection to send a PASV command to the server and then receives a server IP address and server port number from the server, which the client then uses to open a data connection from an arbitrary client port to the server IP address and server port number received.Both modes were updated in September 1998 to support IPv6. Further changes were introduced to the passive mode at that time, updating it to extended passive mode.
转载请注明原文地址:http://tihaiku.com/congyezige/2429925.html
本试题收录于:
初级网络管理员题库软件水平考试初中高级分类
初级网络管理员
软件水平考试初中高级
相关试题推荐
TCP/IP()layerprotocolsprovideservices
TCP/IP()layerprotocolsprovideservices
Atransportlayerprotocolhasseveralr
Atransportlayerprotocolhasseveralr
Atransportlayerprotocolhasseveralr
OSPFisalink-stateroutingprotocol。It
OSPFisalink-stateroutingprotocol。It
OSPFisalink-stateroutingprotocol。It
TheHypertextTransferProtocol,theWe
TheHypertextTransferProtocol,theWe
随机试题
ControllingYourConcentrationI.Theconcernedinformation
AuditorfromAcmeIndustries:LastweekatAcmeBakery,aboutsixpercentofthe
Severalmonthshasalreadypassed,butsheisstill____________withherfailur
照射量的国际单位是A.C·kg B.R·kg C.C·kg D.m·kg
土质路基压实时,三四级公路铺筑水泥混凝土路面或沥青混凝土路面时,其压实度应采用(
下列说法中,正确的有() ①证券经纪商向客户收取的佣金不得高于证券交易金额的
护士指导佝偻病患儿家属不正确的是A:经常抱患儿进行户外活动 B:补充维生素D和
19世纪90年代英国军队在镇压苏丹马赫迪起义时,使用的新式武器是()。A.来复枪
甲公司持有乙公司80%的股权,对其能够实施控制。2×18年6月20日,甲公司将一
根据拟建工程的具体情况,列入工程量清单中其他项目清单的有()。A.暂列金额 B
最新回复
(
0
)