A.25
B.40
C.21
D.110
[单选题]F.TP服务运行的默认端口号为( )。A.80B.40C.21D.90
[单选题]F.TP服务运行的默认端口号为( )A.80B.40C.21D.30
[单选题]POP3服务默认的TCP端口号是______。A.20B.25C.80D.110
[单选题]POP3服务默认的TCP端口号是______。A.20B.25C.80D.110A.B.C.D.
[单选题]POP3服务默认的TCP端口号是()。A . 20B . 25C . 80D . 110
[单选题]POP3服务默认的TCP端口号是( )。A.20B.25C.80D.110
[单选题] POP3 服务默认的TCP 端口号是 (66) 。A. 20 B. 25 C. 80 D. 110
[单选题]POP3服务默认的TCP端口号是(70)。A.20B.25C.80D.110
[单选题] POP3服务默认的TCP 端口号是 (70) 。(70)A. 20 B. 25 C. 80 D. 110
[单选题] POP3服务默认的TCP 端口号是 (66) 。(66)A. 20B. 25C. 80D. 110