TCP wrapper

An intrusion detection system (IDS) that is installed on a single computer and can monitor the activities on that computer. A host-based IDS is able to pinpoint the files and processes compromised or employed by a malicious user to perform unauthorized activity.
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A set of communications protocols that encompasses media access, packet transport, session communications, file transfer, electronic mail, terminal emulation, remote file access, and network management. TCP/IP provides the basis for the Internet. The structure of TCP/IP is as follows: Process layer clients: FTP, Telnet, SMTP, NFS, DNS; Transport layer service providers: TCP (FTP, Telnet, SMTP), UDP (NFS, DNS); Network layer: IP (TCP, UDP); and Access layer: Ethernet (IP), Token ring (IP).
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A type of firewall that controls external access by operating at the application layer. Application firewalls often readdress outgoing traffic so that it appears to have originated from the firewall rather than the internal host.
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A firewall that filters traffic based on the Internet service (in other words, application) used to transmit or receive the data. Application-level gateways are known as second-generation firewalls.
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An Application layer firewall configured specifically to protect against web-based attacks and exploitations.
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