1) FTP – 20 (Data), 21 (Command) TCP
2) TFTP - UDP
2) TFTP - UDP
3) SSH - 22
4) DNS – 53 ( Zone Transfer in TCP, DNS Queries in UDP)
A client computer will always send a DNS Query using UDP Protocol over Port 53. If a client computer does not get response from a DNS Server, it must re-transmit the DNS Query using the TCP after 3-5 seconds of interval.
A client computer will always send a DNS Query using UDP Protocol over Port 53. If a client computer does not get response from a DNS Server, it must re-transmit the DNS Query using the TCP after 3-5 seconds of interval.
5) DHCP – 67, 68 (Client) - UDP
6) NTP – 123
7) POP3 - 110
8) POP3S - 993
9) IMAP - 143
10) IMAPS – 995
11) NFS – 2049 (Default is TCP, UDP can also be used)
12) SMB – 137, 138, 139
13) SQUID - 3128
13) SQUID - 3128
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