Answer :
Filtering ports 139 and 445 helps prevent unauthorized access and potential exploitation of null sessions your network. The correct answer is option D: 139 and 445.
Null sessions, which are unauthenticated connections to Windows NT or 2000 systems without using a username or password, can pose a security risk. To mitigate this risk, certain TCP and UDP ports need to be filtered to prevent unauthorized access.
Port 139 is used by the NetBIOS Session Service, which is often used for file and printer sharing. Port 445 is used by the Server Message Block (SMB) protocol, which is responsible for file and printer sharing as well as other network communications. Both of these ports are commonly exploited by attackers attempting to establish null sessions.
Filtering ports 139 and 445 helps prevent unauthorized access and potential exploitation of null sessions. By blocking these ports at network boundaries or using intrusion prevention systems, organizations can enhance their network security and protect against potential vulnerabilities.
Option D is the answer.
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