下面提供FTP服务的默认TCP端口号是
选项:
A:
21
B:
25
C:
23
D:
80
21
25
23
80
以下文字与答案无关
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25
C:23
D:80
20
B:21
C:23
D:25
5242
B:20
C:21
D:31252
21
B:25
C:110
D:22
22
B:25
C:21
D:23
TCP提供可靠交付的服务
B:每一条TCP链接只能有两个端点
C:面向报文
D:提供全双工通信
FTP
B:WWW
C:Teinet
D:BBS
PPP
B:IP
C:UDP
D:TCP
SMTP
B:FTP
C:TELNET
D:SNMP
FTP
B:DNS
C:SMTP
D:HTTP
Ftp
B:Www
C:Telnet
D:电子邮件
HTTP
B:TCP/IP
C:DHCP
D:FTP
17%
B:19%
C:21%
D:23%
E:25%
. In FTP Passive mode, the client completes the initialization of control and data TCP sessions
B:In FTP Active mode, the server sends a command "PORT" to notify the client of which port to send data
C:FTP always uses a TCP session to transmit control information and data information
D:.FIP always uses TCP port 20 to establish a data session. ICP port 21 is used to establish a control session. E.FTP always uses TCP port 21 to establish a data session. TCP port 20 is used to set up a control session.
21
B:22
C:23
D:24
10000
B:23
C:80
D:53
TCP SYN
B:TCP connect
C:TCP ACK
D:TCP FIN
access-list 101 deny tcp 172.168.0.0 0.0.0.255 host 10.1.0.10 eq ftp
B:access-list 101 permit tcp 172.168.0.0 0.0.0.255 host 10.1.0.10 eq ftp
C:access-list 101 deny tcp host 10.1.0.10 172.168.0.0 0.0.0.255 eq ftp
D:access-list 101 permit tcp host 10.1.0.10 172.168.0.0 0.0.0.255 eq ftp