TAILIEUCHUNG - Network+ Certification (Outline) - Chapter 12: Remote network access

This chapter includes contents: Types of remote network connections, public switched telephone network (PSTN), modems, modem communications, configuring a modem, Virtual Private Network (VPN) communications,. | 1 2 3 4 5 Chapter 12 Remote Network Access Chapter Overview A. Using Remote Connections B. SLIP and PPP C. WAN Technologies Chapter 12 Lesson 1 Using Remote Connections 1. Remote Networking A. Connecting to a remote network using a modem or other device is not very different from connecting to a LAN. 1. From the network layer up a remote connection is no different from a direct LAN connection but the data-link and physical layers can take several different forms. B. Modems and other wide area networking devices can function as network interfaces just as network interface adapters do. C. Remote network connections can take several forms including 1. Computers to Internet service providers ISPs 2. Computers to private networks 3. Computers to computers 4. Networks to networks 2. Connection Types A. Public Switched Telephone Network PSTN 1. Technical name for the standard voice telephone system 2. Also known as the Plain Old Telephone Service POTS 3. Analog circuit-switched network 4. Works with asynchronous modems to transmit data between computers at almost any location 5. Typically uses copper-based twisted-pair cable with RJ-11 jacks a. RJ-11 connectors have four or sometimes six pins rather than the eight pins in the RJ-45 connectors used by LANs. 6. Modems a. A modem modulator demodulator is required to convert a computer s digital signals to the analog signals used by PSTN. b. At the other end of the connection another modem converts the analog signals back to digital. c. Early modems used proprietary communication protocols requiring the same manufacturer s modems at each end of the connection. d. Today organizations such as the International Telecommunication Union ITU develop specifications for the communication compression and error-detection protocols that modems use when generating and interpreting analog signals. 6 7 1 The ITU was formerly known as the Comité Consultatif International Télégraphique et Téléphonique CCITT . e. is the current .

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