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FTP协议，PORT命令的作用是（）
- A、显示当前所在目录
- B、在主动模式中客户端告诉服务器自己的数据连接端口
- C、上传文件
- D、下载文件
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更多 “FTP协议，PORT命令的作用是（）A、显示当前所在目录B、在主动模式中客户端告诉服务器自己的数据连接端口C、上传文件D、下载文件” 相关考题
考题
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 （ ） 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 （请作答此空） 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.command-line
B.graphical
C.automation
D.productivity
考题
下面关于FTP的描述中，错误的是（ ）。A.FTP是文件传输协议
B.FTP标准控制命令TCP端口号为21，数据传输TCP端口为20
C.FTP协议传输的数据是经过加密的
D.FTP协议相比TFTP协议来说更加复杂
考题
下列关于Ftp服务说法错误的是（）。A、Ftp连接包括用于传输命令的控制连接和用于传输数据的数据连接B、控制连接由服务器端发起C、Ftp服务不依赖于具体的操作系统D、Ftp协议属于应用层的协议
考题
Using FTP passive mode， after the client opens thecommand channel （port 21） to the FTP server and requests passive mode， what will be the next step？ （）A、 The FTP server sends back an acknowledgment （ACK） to the clientB、 The FTP server allocates a port touse for the data channel and transmit that port number to the clientC、 The FTP server opens the data channel to the client using the port number indicated by the clientD、 The FTP client opens the data channel to the FTP server on Port 20E、 The FTP client opens the datachannel to the FTP server on Port 21
考题
关于FTP和TFTP的描述，正确的是（）A、FTP和TFTP都是基于TCP协议B、FTP和TFTP都是基于UDP协议C、FTP基于TCP协议、TFTP基于UDP协议D、FTP基于UDP协议、TFTP基于TCP协议
考题
Which ports must be left open if an administrator plans to perform Dynamic LPAR operations？（）A、 port 21（ftp）：tcp and port 657（rmc）：tcpB、 port 22（ssh）：tcp and port 657（rmc）：udpC、 port 657（rmc）：tcp and port 657（rmc）：udpD、 port 161（snmp）：tcp and port 161（snmp）：udp
考题
以下FTP的主动传输和FTP的被动传输说法正确的是（）。A、FTP的主动传输模式由FTP客户端主动向服务器建立数据连接B、FTP的主动传输模式由FTP服务器主动向客户端建立数据连接C、FTP的被动传输模式的服务器及客户端均采用临时端口建立数据连接D、FTP的被动传输模式使用PORT命令E、FTP的被动传输模式使用PASV命令
考题
以下关于FTP的说法错误的是（）。A、FTP支持主动和被动两种访问方式。B、主动模式中，客户端需要接受数据时，发送PORT命令。C、被动模式中，客户端建立连接后，发送PORT命令。D、普通FTP服务要求用户在登录时提供正确的用户名和用户密码。
考题
单选题You create a shared Internet connection on a Windows 2000 Professional computer. Your network has 10 users on the LAN. All of the users can connect to HTTP sites， FTP sites， and streaming audio content on the Internet. One of the computers on your LAN is running an FTP host application. Users on the Internet cannot connect to the FTP host on your network. What should you do？（）A
Configure the FTP host to accept incoming requests on service port 80.B
Configure an Internet Connection Sharing application type for FTP to use remote server port 23.C
Configure an Internet Connection Sharing service type for FTP use service port 21 on the FTP host computer.D
Configure an Internet Connection Sharing service type for FTP use service port 23 on the FTP host computer.
考题
判断题使用NAT的缺点之一是由于需要对数据报文进行IP地址的转换，涉及IP地址的数据包的包头不能被加密。在应用协议中，不能使用加密的FTP连接，否则FTP的PORT命令不能被正确转换。（）A
对B
错
考题
单选题Using FTP passive mode， after the client opens thecommand channel （port 21） to the FTP server and requests passive mode， what will be the next step？ （）A
The FTP server sends back an acknowledgment （ACK） to the clientB
The FTP server allocates a port touse for the data channel and transmit that port number to the clientC
The FTP server opens the data channel to the client using the port number indicated by the clientD
The FTP client opens the data channel to the FTP server on Port 20E
The FTP client opens the datachannel to the FTP server on Port 21
考题
单选题以下关于FTP的说法错误的是（）。A
FTP支持主动和被动两种访问方式。B
主动模式中，客户端需要接受数据时，发送PORT命令。C
被动模式中，客户端建立连接后，发送PORT命令。D
普通FTP服务要求用户在登录时提供正确的用户名和用户密码。
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