A client access license (CAL) is a type of license binding the licensee to a set of user terms limiting how the organization's services are used. This is typically done using software accompanied by a certificate of authenticity and a several digit license key. The end user is required to verify their CAL by transposing the license key numbers into a designated field prior to downloading the software.
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Multiprotocol label switching (MPLS) is a mechanism used within computer network infrastructures to speed up the time it takes a data packet to flow from one node to another. It enables computer networks to be faster and easier to manage by using short path labels instead of long network addresses for routing network packets.