In Windows networking, a null session is established by which method?

• A. Using a standard user account.
• B. Using a guest account without password.
• C. Authenticating with local administrator credentials.
• D. Connecting with no credentials (null session).

Answer: (D)

Null sessions are unauthenticated connections to Windows resources. They occur when a client connects without supplying any user name or password, effectively doing an anonymous login. This type of session historically allowed access to certain IPC shares and enabled enumeration of what a target exposes, which is why it’s described as a session established with no credentials. The correct approach here is connecting with no credentials, i.e., a null session.

Using a standard user account, a guest account with a password, or authenticating with administrator credentials all involve providing credentials and create authenticated sessions, not null (anonymous) ones.