Answer :
A stateless firewall treats each incoming packet as a separate entity, regardless of the connections that are currently open.
A key and an access granting ticket are equivalent when using Kerberos. One of these two types of user access to network resources applies: 1) The ability to run, download, and install software, and 2) authorization to access, edit, add, or remove data files and folders. A proxy server, usually referred to as a "proxy" or a "application-level gateway," is a computer that serves as a bridge between a local network (for instance, all the computers at one business or in one building) and a wider network like the internet.
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