CompTIA Security+ Question B-75

Which of the following ports should be opened on a firewall to allow for NetBIOS communication? (Select TWO).

A. 110
B. 137
C. 139
D. 143
E. 161
F. 443

Answer: B,C

Explanation:
NetBIOS provides four distinct services: Name service for name registration and resolution (port: 137/udp) Name service for name registration and resolution (port: 137/tcp) Datagram distribution service for connectionless communication (port: 138/udp) Session service for connection-oriented communication (port: 139/tcp)