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All-in-One CISA® Certified Information Systems Auditor: Exam Guide, Second Edition by Peter Gregory

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Wide Area Network Protocols

This section describes several well-known protocols used in wide area networks.

MPLS

Multiprotocol Label Switching, or MPLS, is a variable-length, packet-switched network technology. In an MPLS network, each packet has one or more labels affixed to it that contain information that helps MPLS routers to make packet-forwarding decisions, without having to examine the contents of the packet itself (for an IP address, for instance).

MPLS can be used to carry many types of traffic, including Ethernet, ATM, SONET, and IP. It is often used to trunk voice and data networks over WAN connections between business locations in an enterprise network. One of the strengths of MPLS is its QoS properties, which facilitate the rapid ...

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