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A tag is a keyword or label that categorizes your question with other, similar questions.

Virtualization is a group of software technologies that allow abstraction between layers of a system. This allows separation between the logical layers of the system, providing isolation, flexibility, and/or the ability to run more than one at a time. This differs from most traditional systems where the various layers are inherently tied.
3610 questions
Questions about any version of Microsoft Exchange Server or Exchange Online, Microsoft's email and unified communications server product. Because of tight integration with other systems, related questions may overlap with Active Directory, Office 365, and Skype for Business (aka Lync Server or Office Communications Server). Questions about Microsoft Outlook may be a gray area, with Super User as an alternative site to ask on.
3564 questions
Bash is the Bourne Again SHell, the successor to the classic Unix sh (shell).
3527 questions
Device or program that stands between two or more interconnected programs/devices
3307 questions
Windows 7 is the Microsoft PC operating system released in October 2009, and reached End Of Life on January 14, 2020. It is the successor to Windows Vista and has been succeeded by Windows 8. It shared the same UI style as Windows Vista, but was based on an incrementally newer version of the NT kernel (6.1, from 6.0) and was released in 6 major editions for both home and professional use.
3300 questions
Refers to the software or hardware that make up a webserver, delivering content on a private or public website.
3296 questions
Linux Networking refers to any networking function performed by a server running Linux. A Linux server operating as a router or firewall are the most common applications.
3288 questions
OpenVPN is a free and open source software VPN solution. It allows secure point-to-point or site-to-site connections with routed or bridged configurations and remote access facilities.
3274 questions
Red Hat is an open source technology solutions provider with offerings including Red Hat Enterprise Linux, open source applications, security and systems management, virtualization, Services Oriented Architecture (SOA) solutions, server and desktop operating systems, Java application software and services, and the JBoss Enterprise Middleware Suite. Please also consider whether or not the more specific RHEL5 or 6 tags might be appropriate as well.
3259 questions
SSL certificates are used to encrypt and authenticate connections to network servers, most popularly for web servers but also email, file transfers, and other network connections.
3250 questions
VMWare ESXi is an installable/embeddable virtualization platform based around the ESXi Hypervisor.
3219 questions
A reverse proxy is a type of proxy server that fetches resources from a specific defined set of servers for a client. It is used in cases when there is an advantage to not exposing the web server with the content directly whether it be for security reasons or because of a lack of available public IP addresses.
3190 questions
Group Policy is a built-in feature of the Microsoft Windows operating systems. Group Policy allows administrators to automatically configure myriad options within the OS. These policies can be configured, and applied, either locally to the computer via Local Group Policy or remotely within an Active Directory environment.
3186 questions
Questions about server hardware and software performance, or network performance.
3181 questions
SMTP is the Simple Mail Transfer Protocol, the most recent standard of which is defined in RFC 5321. It's the Internet standard for sending and receiving email.
3133 questions
Refers to the hardware or software that make up a server dedicated to sending and receiving emails. Many popular modern email servers bundle other functionality for contacts and calendaring along email delivery.
3029 questions
Google Cloud Platform provides cloud computing services that let you build applications and websites, store data, and analyze data on Google's infrastructure.
2968 questions
CentOS is a Linux distribution standing for "Community ENTerprise Operating System" and is a rebuild of "Red Hat Enterprise Linux" (RHEL), belonging to the same company that distributes RHEL (Red Hat, Inc.). The "CentOS7" tag refers to versions 7.x-xxxx of CentOS, working only on 64-bit hardware. Maintenance updates for CentOS/RHEL 7 will stop on June 30, 2024, with full updates ceasing in winter of 2019.
2960 questions
Recording activity on the system (or of a particular program) for later reporting and analysis. Logins, logouts, web server page requests, etc might all be logged.
2851 questions
IP - Internet Protocol, the most commonly-used set of rules for dispatching data across a large computer network.
2827 questions
Windows Server 2012 is a server operating system from Microsoft. It went RTM on August 1st of 2012, general release on September 4, 2012, and reached End Of Life on October 10, 2023. Like its predecessor, Server 2008 R2, it is only available in 64 bit versions. It contains many substantial changes over it predecessor, and substantially streamlines the number of available versions, which are down to four: Foundation, Essentials, Standard and Datacenter.
2822 questions
A virtual machine (VM) is a completely isolated guest operating system installation within a normal host operating system. It is a software implementation of a machine (i.e. a computer) that executes programs like a physical machine.
2821 questions
Directory-level configuration file found mostly on Apache web servers
2807 questions
Questions relating to virtual hosting; that is, serving content for multiple logically-separate entities from the same machine. Usually relates to name-based virtual hosting in the web server, but can also cover other protocols such as SMTP or IMAP.
2749 questions
Load balancing deal with the techniques involved on using multiple systems to deal with high demands, balancing the load between those multiple systems. Questions deal with networking and server load balancing, using dedicated hardware or not.
2747 questions
Lightweight Directory Access Protocol (LDAP) for reading and editing directories over an IP network
2728 questions
A collection of computers or other networked resources.
2711 questions
Configuration is a general term that can refer to the arrangement of functional units according to their nature and characteristics. Also, it can refer to software configuration which more suitable for server-related topics.
2704 questions
Cisco is a provider of switches and routers to commercial consumers. Cisco devices run IOS or NX-OS operating systems. This is a generic tag to be used when no more specific tags are available. See the partial list of tags in the full Tag Wiki.
2629 questions
HTTPS stands for HTTP Secure and is a combination of HTTP and SSL/TLS (Secure Sockets Layer/Transport Layer Security) and is used to provide an encrypted connection to a website.
2524 questions
File Transfer Protocol is a standard network protocol used to transfer data across TCP-based networks between hosts.
2494 questions
Applications or appliances that observe machines, systems and networks to find problems and notify administrators.
2449 questions
Questions about hard disks' performance, issues, tips, and software.
2448 questions
Microsoft Hyper-V is a hypervisor-based virtualization system for x86-64 systems. Hyper-V exists in two variants: as a stand-alone product called Microsoft Hyper-V Server, and as an installable role in Windows Server 2008 and later. Both variants are able to run in Windows Server Core versions.
2443 questions
Mac OS X is an operating system from Apple Inc. It was the successor to Mac OS 9 and here the 'X' means 10. Mac OS X is based upon the NeXTSTEP and OpenStep OSes developed in the 1980s and 1990s by NeXT Inc., which Apple purchased in 1996.
2425 questions
KVM (for Kernel-based Virtual Machine) is a full virtualization solution for Linux on x86 hardware containing virtualization extensions (Intel VT or AMD-V). It consists of a loadable kernel module, kvm.ko, that provides the core virtualization infrastructure and a processor specific module, kvm-intel.ko or kvm-amd.ko. KVM also requires a modified QEMU although work is underway to get the required changes upstream.
2405 questions