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Which of the following is a ITU-T standard protocol suite for packet switched wide area network communication?
Correct Answer: B
Explanation/Reference: X.25 is an ITU-T standard protocol suite for packet switched wide area network (WAN) communication.X.25 is a packet switching technology which uses carrier switch to provide connectivity for many different networks. For your exam you should know below information about WAN Technologies: The following answers are incorrect: Point-to-point protocol - PPP (Point-to-Point Protocol) is a protocol for communication between two computers using a serial interface, typically a personal computer connected by phone line to a server. Frame Relay - The Frame relay cloud is the collection of DCE that provides that provides switching and data communication functionality. Frame relay is any to any service. ISDN -Enables data, voice and other types of traffic to travel over a medium in a digital manner previously used only for analog voice transmission. Same copper telephone wire is used. Provide digital point-to-point circuit switching medium. The following reference(s) were/was used to create this question: CISA review manual 2014 page number 266