Which port is used by NetBIOS datagram service?

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Multiple Choice

Which port is used by NetBIOS datagram service?

Explanation:
NetBIOS over TCP/IP assigns separate ports to its different services: name service, datagram service, and session service. The datagram service is used for sending small, connectionless NetBIOS messages, and it uses port 138, typically over UDP. This fits the datagram model, where delivery is best-effort and doesn't establish a persistent connection. The other NetBIOS ports are 137 for the name service (mapping NetBIOS names to IPs) and 139 for the session service (establishing NetBIOS sessions). The remaining ports listed correspond to unrelated protocols—port 143 is IMAP and port 389 is LDAP.

NetBIOS over TCP/IP assigns separate ports to its different services: name service, datagram service, and session service. The datagram service is used for sending small, connectionless NetBIOS messages, and it uses port 138, typically over UDP. This fits the datagram model, where delivery is best-effort and doesn't establish a persistent connection. The other NetBIOS ports are 137 for the name service (mapping NetBIOS names to IPs) and 139 for the session service (establishing NetBIOS sessions). The remaining ports listed correspond to unrelated protocols—port 143 is IMAP and port 389 is LDAP.

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