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Infrastructure specific terms

SAN: Enhance storage devices - Disk arrays and tapes
SANs make disk arrays and tape libraries accessible to servers so that the devices appear to the OS as locally attached devices; SAN is a separate network of storage devices not accessible through LAN by other devices.

NAS: A single device or server or computing appliance, sharing its own storage over the network.

iSCSI: Transports block-level data between an iSCSI initiator on a server and and iSCSI target on a storage device. The protocol encapsulates SCSI commands, assembles the data packets for the TCP/IP layer. Packets are transferred using point-to-point connection.

Bastion host is a special purpose computer on a network specifically designed and configured to withstand attacks, generally hosts single application. Ex. a proxy server, and all other services are removed or limited to reduce the threat to the computer.

Source: Wikipedia

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