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CentOS 5 is an obsolete, free (as in beer and speech) GNU/Linux distribution that is community driven and based on source code released from RHEL.
806 questions
In cryptography, a certificate authority, or certification authority, (CA) is an entity that issues digital certificates.
785 questions
Encryption is transforming information through a cipher to protect it from unauthorized access.
775 questions
An access-list is a list of rules, usually held on network devices such as switches, routers or firewalls, that matches network traffic. The specific term 'access-list' is used in the context of Cisco devices, although the concept of an 'access list' is more generic.
773 questions
In computing, failover is automatic switching to a redundant or standby computer server, system, or network upon the failure or abnormal termination of the previously active application, server, system, or network. Failover and switchover are essentially the same operation, except that failover is automatic and usually operates without warning, while switchover requires human intervention.
772 questions
The Cisco ASA (Adaptive Security Appliance) series of products provide Firewall and VPN functionality.
772 questions
NAS stands for Network Attached Storage, a mechanism for providing file-level access to storage across a network.
763 questions
VMware ESX is an enterprise-level computer virtualization product offered by VMware, Inc.
761 questions
"A DNS zone is a portion of a domain name space using the Domain Name System (DNS) for which administrative responsibility has been delegated." (From Wikipedia, the free encyclopedia)
757 questions
A connection generally refers to a TCP/IP connection, that is established as the result of the handshake between 2 hosts.
757 questions
Pluggable authentication modules, a flexible framework for configuring authentication, most commonly the login component of Linux systems, but used in other components and operating systems.
752 questions
The MX record is a type of resource record in the Domain Name System that specifies a mail server responsible for accepting email messages on behalf of a recipient's domain.
752 questions
Amazon Virtual Private Cloud (Amazon VPC) lets you provision a logically isolated section of the Amazon Web Services (AWS) Cloud where you can launch AWS resources in a virtual network that you define
747 questions
Ubuntu 18.04, named "Bionic Beaver" is a Long Term Support release of Ubuntu Linux (released on April 26th, 2018). Note that http://askubuntu.com is specifically dedicated to Ubuntu questions.
746 questions
SNMP (Simple Network Management Protocol) is an Internet-standard protocol for monitoring and configuring devices on IP networks.
735 questions
The Internet is a global system of interconnected computer networks that use the standard Internet protocol suite (often called TCP/IP, although not all protocols use TCP) to serve billions of users worldwide. It is a network of networks that consists of millions of private, public, academic, business, and government networks, of local to global scope, that are linked by a broad array of electronic, wireless and optical networking technologies.
734 questions
FastCGI is an open interface web servers can use to execute applications in a secure and isolated manner.
730 questions
A CNAME record or Canonical Name record is a type of resource record in the Domain Name System (DNS) that specifies that the domain name is an alias of another, canonical domain name.
727 questions
Ubuntu Linux is a Debian derivative that aims to bring Linux mainstream. Questions on this site should generally refer to Ubuntu Server. Note that http://askubuntu.com is specifically dedicated to Ubuntu questions.
726 questions
The Macintosh or Mac is a series of several lines of personal computers designed, developed, and marketed by Apple Inc.
722 questions
When asking regex questions, always add the tag for the specific programming language or tool (e.g., Perl, Python, or Java; vi, emacs, or ɢɴᴜ grep; etc.) you are using.
720 questions
In computer networking and computer science, bandwidth, network bandwidth, data bandwidth, or digital bandwidth is a measure of available or consumed data communication resources expressed in bits/second or multiples of it (kilobits/s, megabits/s etc.).
719 questions
RPM Package Manager is a package management system used primarily for GNU/Linux operating systems. It used the .rpm file format.
718 questions
NTP stands for Network Time Protocol, and it is an Internet protocol used to synchronize the clocks of computers to some time reference.
717 questions
Exchange Server 2013 is the version of Microsoft Exchange that went RTM on October 11, 2012. It replaced Exchange Server 2010. Exchange Server is the email server product developed by Microsoft, and (most notably), integrates calendaring and contact management software with its email functionality.
716 questions
Ethernet is the most common set of standards for wired connections in local area networks.
710 questions
Fail2ban scans log files like /var/log/pwdfail or /var/log/apache/error_log and bans IP that makes too many password failures. It updates firewall rules to reject the IP address.
705 questions
RAID solution with hardware assistance. RAID parity calculations can be performed by either the main CPU, or by a separate processor on the RAID controller card.
693 questions
Module for the apache webserver with which apache can be used as proxy server. With this module apache can act as a regular proxy, or as a reverse proxy for upstream servers.
689 questions
The amount of processing units of the CPU used to execute a task and how long it takes.
685 questions
A directory, also commonly called a folder, is a filesystem object used for organizing files and other directories.
682 questions
NSA Security-Enhanced Linux (SELinux) is an implementation of a flexible mandatory access control architecture in the Linux operating system.
681 questions
rsyslog is an enterprise-ready replacement for the syslog daemon on Linux and other UNIX operating systems.
681 questions