WANs and Remote Connectivity

Describe the wireless spectrum. Describe how interference can distort and weaken a wireless signal. Describe the Frequency-Hopping Spread Spectrum (FHSS) and Direct-Sequence Spread Spectrum (DSSS) spread spectrum technologies. Define and explain the multiple-input and multiple-output (MIMO) innovation in the 802.11n standard. Explain the advantages it provides. Describe what an administrator can do if during a wireless router configuration, something goes awry. Explain how residential Worldwide Interoperability for Microwave Access (WiMAX) is installed. Explain how the satellite Internet access service known as a satellite return arrangement works.

How does implementing VoIP assist in centralizing voice and data network management? Describe five features unique to Internet protocols (IP) telephones.

Explain the issue regarding the need for electric current that IP telephones face. Besides being extremely mobile, describe another advantage to softphones. Describe six functions performed by signaling protocols. Explain why media gateway controllers (MGCs) are especially advantageous on large VoIP networks.

Explain how gateways on a converged network exchange and translate signaling and control information with each other so that voice and video packets are properly routed through the network.

Explain why user datagram protocol (UDP) is preferred over Transmission Control Protocol (TCP) for real-time applications such as telephone conversations and Video conferences. Describe the RTP, defined in Request for Comments (RFC) 3550 by the Internet Engineering Task Force (IETF).