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X-Auth (Extended Authentication) provides added security for VPN by requiring each VPN client to use a username and password.



X.509 is a recommendation that defines formats for certificates and CRLs. It was issued by the ITU-T.



This is Microsoft’s gaming console.


Xbox Live

This is Microsoft’s gaming service that lets you play multiplayer Xbox games through the Internet.



Digital Subscriber Line(s)where x, when specified, denotes a particular type of DSL, for example, ADSL, G.SHDSL, SDSL, VDSL, RDSL, etc.



XFP (10 Gigabit Small Form-factor Pluggable) is a compact hot-swappable optical transceiver that connects a switch, router or device to a fiber-optic cable for a 10 Gigabit Ethernet connection.


XFP Slot

This is a slot for using an XFP (10 Gigabit Small Form-factor Pluggable) hot-swappable optical transceiver that allows 10 Gigabit Ethernet connections.



XFS is a journaled file system that allows for files as large as 16 terabytes. Due to the system’s design, it does not easily support backup system snapshots. Instead, it was designed with the intention that a logical volume manager would handle the snapshot/snapshot restoration process. This is not to be confused with the X Windows Font server, which shares the acronym.



XGA (Extended Graphics Array) describes standard 4:3 aspect ratio (1024 by 768) resolutions used by display monitors.