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Utility Protocol Port Number
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DNS
Allows the use of DNS naming UDP port 53
DHCP
Automatic IP addressing UDP port 67, 68
LDAP
Querying directories TCP port 389
SNMP
Remote management of network devices UDP port 161 , 162
SMB/CIFS
Windows folder / file sharing TCP 445
UDP 137, 138, 139
NetBIOS/NetBT
NetBIOS over TCP/IP TCP 137, 139
UDP 137, 138