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Chapter 06 teleworker services
Chapter 6: Teleworker Services CCNA Exploration 4.0 2 Objectives • Describe the enterprise requirements for providing teleworker services, including the differences between private and public network infrastructures. • Describe the teleworker requirements and recommended architecture for providing teleworking services. • Explain how broadband services extend enterprise networks using DSL, cable, and wireless technology. • Describe the importance of VPN technology, including its role and benefits for enterprises and teleworkers. • Describe how VPN technology can be used to provide secure teleworker services to an enterprise network. 3 Business Requirements for Teleworker Services 4 • More and more companies are finding it beneficial to have teleworkers. The Business Requirements for Teleworker Services 5 The Teleworker Solution • Organizations need secure, reliable, and cost-effective networks to connect corporate headquarters, branch offices, and suppliers. • Three remote connection technologies available to organizations for supporting teleworker services: – Traditional private WAN Layer 2 technologies, including Frame Relay, ATM, and leased lines, provide many remote connection solutions. The security of these connections depends on the service provider. – IPsec Virtual Private Networks (VPNs) offer flexible and scalable connectivity. – Site-to-site connections can provide a secure, fast, and reliable remote connection to teleworkers. 6 The Teleworker Solution 7 Teleworker Solution Components 8 Broadband Services 9 Connecting Teleworkers to the WAN • Teleworkers typically use diverse applications (for example, e-mail, web-based applications, mission-critical applications, real-time collaboration, voice, video, and videoconferencing) that require a high-bandwidth connection. • The choice of access network technology and the need to ensure suitable bandwidth are the first considerations to address when connecting teleworkers. • Dialup access – An inexpensive option that uses any phone line and a modem. To connect to the ISP, a user calls the ISP access phone number. – Dialup is the slowest connection option, and is typically used by mobile workers in areas where higher speed connection options are not available. 10 Connecting Teleworkers to the WAN DSL • Also uses telephone lines, more expensive than dialup, but provides a faster connection. • Provides a continuous connection to the Internet. • Uses a special high-speed modem that separates the DSL signal from the telephone signal and provides an Ethernet connection to a host computer or LAN. [...]...Connecting Teleworkers to the WAN Satellite • Offered by satellite service providers • The computer connects through Ethernet to a satellite modem that transmits radio signals to the nearest point of presence (POP) within the satellite network 11 Connecting Teleworkers to the WAN Cable modem • Offered by cable television service providers... from the other signals carried on the cable and provides an Ethernet connection to a host computer or LAN 12 Cable • • • • • Accessing the Internet through a cable network is a popular option used by teleworkers to access their enterprise network The cable system uses a coaxial cable that carries radio frequency (RF) signals across the network Coaxial cable is the primary medium used to build cable... CableLabs Euro-DOCSIS is a variation adapted for use in Europe About DOCSIS: http://www.cablemodem.com/specifications About Euro-DOCSIS: http://www.euro-docsis.com 17 Sending Data over Cable • • Delivering services over a cable network requires different radio frequencies Downstream frequencies are in the 50 to 860 MHz range, and the upstream frequencies are in the 5 to 42 MHz range Two types of equipment... either end of a copper wire that extends between the CPE and the DSL access multiplexer (DSLAM) The two key components are the DSL transceiver and the DSLAM: – Transceiver: Connects the computer of the teleworker to the DSL Usually is a DSL modem connected to the computer using a USB or Ethernet cable Newer DSL transceivers can be built into small routers with multiple 10/100 switch ports suitable for... vessels at sea, airplanes in flight, and vehicles moving on land Three ways to connect to the Internet using satellites: oneway multicast, one-way terrestrial return, and two-way 31 Broadband Wireless • Teleworker equipment generally uses the 2.4 GHz range complying with these standards: – 802.11b - 11 Mb/s, 2.4 GHz – 802.11g - 54 Mb/s, 2.4 GHz – 802.11n > 54 Mb/s, MIMO, 2.4 GHz • The 802.16 (or WiMAX) . reliable remote connection to teleworkers. 6 The Teleworker Solution 7 Teleworker Solution Components 8 Broadband Services 9 Connecting Teleworkers to the WAN • Teleworkers typically use diverse. enterprises and teleworkers. • Describe how VPN technology can be used to provide secure teleworker services to an enterprise network. 3 Business Requirements for Teleworker Services 4 • More. Chapter 6: Teleworker Services CCNA Exploration 4.0 2 Objectives • Describe the enterprise requirements for providing teleworker services, including the differences