An enterprise wants to build a server system and requires the following functions: 1. The enterprise needs to have its own dedicated mailbox, and the sending and receiving of emails needs to go through the enterprise's server; 2. The server must provide file transfer and access services. Users in different departments of the enterprise provide accounts with different permissions: 3. When the enterprise accesses the internal webpage of the enterprise, the enterprise can directly enter the domain name in the browser to access. To meet the above requirements, which of the following servers do enterprises need to deploy? ( )*

Digital signature is to generate a digital fingerprint by using a hash algorithm to ensure the integrity of data transmission

Configure authentication options If you use web push page authentication, you also need to configure a corresponding security policy to allow the data flow with the default port number ( ) to reach the firewall itself. (fill in the blank)

When the FW is deployed at the network egress, if a fault occurs, the entire network service will be affected.
In order to improve the reliability of the network, two FWs need to be deployed and formed ( ) (fill in the blank)

ASPF (Application Specific Packet Filter) is a packet filtering technology based on the application layer and implements a special security mechanism through the server-map table.
Regarding ASPF and server-map tables, which of the following are correct? (Multiple choice)