Under normal circumstances, the email protocols we often talk about include _____, POP3, SMTP

Information security grade protection is to improve the overall national security level, and at the same time to rationally optimize the allocation of security resources, so that it can return the greatest security economic benefits

When the administrator upgrades the USG firewall software version, which of the following operations are necessary? (Multiple choice)

Regarding the actions of the security policy and the description of the security configuration file, which of the following options are correct? (Multiple choice)

1. The enterprise needs to have its own dedicated mailbox, and the sending and receiving of mail needs to go through the enterprise's server;
2. The server must provide file transfer and access services, and provide accounts with different permissions for users in different departments of the enterprise;
3. The enterprise can directly enter the domain name in the browser when accessing the internal webpage of the enterprise.
To meet the above requirements, which of the following servers does the enterprise need to deploy? (Multiple choice)