TCP & UDP Ports

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Last updated 8:44 PM on 6/23/26
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38 Terms

1
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Which port is used for FTP data transfer?
TCP port 20
2
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Which port is used for FTP control connections?
TCP port 21
3
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What does FTP port 20 handle?
File data transfer
4
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What does FTP port 21 handle?
Session control
5
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Which port does SSH use?
TCP port 22
6
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Which port does Telnet use?
TCP port 23
7
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Which protocol uses TCP port 25?
SMTP
8
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Which protocol uses port 53?
DNS
9
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Is DNS port 53 TCP or UDP?
Both TCP and UDP
10
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Which port does a DHCP server use?
UDP port 67
11
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Which port does a DHCP client use to receive responses?
UDP port 68
12
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Which protocol uses TCP port 80?
HTTP
13
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Which protocol uses TCP port 110?
POP3
14
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What is POP3 port 110 used for?
Email retrieval
15
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Which ports are used by NetBIOS services?
137. 138. 139
16
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What does NetBIOS port 137 provide?
Name services
17
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What does NetBIOS port 138 provide?
Datagram services
18
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What does NetBIOS port 139 provide?
Session services
19
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Which protocol uses TCP port 389?
LDAP
20
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What is LDAP port 389 used for?
Directory access
21
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Which protocol uses TCP port 443?
HTTPS
22
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What is HTTPS port 443 used for?
Secure web traffic
23
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Which protocol uses TCP port 445?
SMB
24
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What is SMB port 445 used for?
File and printer sharing
25
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Which port is used by RDP?
TCP port 3389
26
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What is RDP port 3389 used for?
Remote desktop access
27
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What is the FTP port number pair?
20 and 21
28
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What is the SSH port number?
22
29
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What is the Telnet port number?
23
30
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What is the SMTP port number?
25
31
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What is the DNS port number?
53
32
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What are the DHCP port numbers?
67 and 68
33
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What is the HTTP port number?
80
34
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What is the POP3 port number?
110
35
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What is the LDAP port number?
389
36
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What is the HTTPS port number?
443
37
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What is the SMB port number?
445
38
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What is the RDP port number?
3389