违法和不良信息举报 联系客服
免费注册 登录

Using FTP passive mode， after the client opens thecommand ch

题目
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 client

B

 The FTP server allocates a port touse for the data channel and transmit that port number to the client

C

 The FTP server opens the data channel to the client using the port number indicated by the client

D

 The FTP client opens the data channel to the FTP server on Port 20

E

 The FTP client opens the datachannel to the FTP server on Port 21

如果没有搜索结果或未解决您的问题，请直接 联系老师 获取答案。
相似问题和答案

第1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 （请作答此空） 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 （ ） 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.browser-server
B.user- server
C.client-server
D.business -customer

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.

第2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 （ ） 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 （请作答此空） 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.system
B.active
C.passive
D.active or passive

答案：D
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.

第3题：

在使用FTP工具向OMC服务器(Linux操作系统)中上传文件时，应选用『____』传送模式。(Using the FTP tool upload file to the OMC server (Linux operating system),the transfer mode should be used in『____』.)


参考答案：Binary
Binary

第4题：

Switch R1 has been configured with DTP using the desirable option.  Which statement describes  Dynamic Trunking Protocol （DTP） desirable mode？（）

  • A、 The interface actively attempts to convert the link to a trunk link.
  • B、 The interface is put into permanent trunking mode but prevented from generating DTP frames.  
  • C、 The interface is put into permanent trunking mode and negotiates to convert the link into a trunk  link.
  • D、 The interface is put into a passive mode， waiting to convert the link to a trunk link.  
  • E、 None of the other alternatives apply

正确答案:A

第5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 client
  • B、 The FTP server allocates a port touse for the data channel and transmit that port number to the client
  • C、 The FTP server opens the data channel to the client using the port number indicated by the client
  • D、 The FTP client opens the data channel to the FTP server on Port 20
  • E、 The FTP client opens the datachannel to the FTP server on Port 21

正确答案:B

第6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

答案：A
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.

第7题：

Which statement about the S-Series native FTP proxy is not true？（） 

  • A、 both active and passive modes FTP are supported
  • B、 by default the FTP proxy uses port 8021
  • C、 access polices may apply to native FTP traffic
  • D、 data loss prevention policies may apply to native FTP traffic
  • E、 authentication is supported in transparent mode

正确答案:E

第8题：

What are two characteristics of a switch that is configured as a VTP client?()

A.if a switch that is configured to operate in client mode cannot access a VTP server,then the switch reverts to transparent mode.

B.The local vlan configuration is updated only when an update that has a higher configuration revision number is received.

C.Vtp advertisements are not forwarded to neighboring switches that are configured in vtp transparent mode.

D.When switches in vtp client mode are rebooted,they send a vtp advertisement request to the vtp servers.

E.Vtp client is the default vtp mode

F.On switches that are configured to operate in client mode ,vlans can be created,deleted,or renamed locally


参考答案：B, D

第9题：

When NIC teaming is used, how are Loops avoided in a virtual switch?（）

  • A、By using active / passive teaming with spanning tree on the active Iink
  • B、By using active / passive teaming with onIy the active Iink in use
  • C、By using active / activate teaming with VM utilizing both uplink ports

正确答案:B

第10题：

Which statement correctly describes a wireless client Layer 2 roam from AP1 to AP2 while joined to a multicast stream using Cisco WLC running v5.2?（）

  • A、Client issues an IGMP join after association with AP2, allowing AP2 to request a multicast stream from  Cisco WLC after AP1 issues an IGMP query.
  • B、Client issues an IGMP join after association with AP2, allowing AP2 to request a multicast stream from  Cisco WLC independent of AP1 multicast member status.
  • C、Client resumes multicast after association with AP2,  because multicast information is sent in mobility  exchanges and AP2 is already a member of the multicast group,  provided that another client has  already joined that multicast.
  • D、Client resumes multicast after association with AP2,  because multicast information is sent in mobility  exchanges and AP2 is already a member of the multicast group,  regardless if any other clients have  already joined that multicast.

正确答案:D

更多相关问题
相关内容