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)

Which of the following options are malicious programs? (Multiple Choices)

Which of the following is the default backup mode of dual-machine hot backup?

Regarding the NAT policy processing, which of the following are correct? (Multiple choice)

The preservation of electronic evidence is directly related to the legal effect of evidence. The authenticity and reliability of the preservation in accordance with legal procedures can be guaranteed. Which of the following is not an evidence preservation technology?