1 Chapter 6 - Teleworker Services CCNA Exploration 4.0 Học viện mạng Bach Khoa - Website: www.bkacad.com 2 Introduction Học viện mạng Bach Khoa - Website: www.bkacad.com 3 Business Requirements for Teleworker Services Học viện mạng Bach Khoa - Website: www.bkacad.com 4 The Business Requirements for Teleworker Services • When designing network architectures that support a teleworking solution, designers must balance organizational requirements for security, infrastructure management, scalability, and affordability against the practical needs of teleworkers for ease of use, connection speeds, and reliability of service. Học viện mạng Bach Khoa - Website: www.bkacad.com 5 The Teleworker Solution • The term broadband refers to advanced communications systems capable of providing high-speed transmission of services, such as data, voice, and video, over the Internet and other networks. • Transmission is provided by a wide range of technologies, including digital subscriber line (DSL) and fiber-optic cable, coaxial cable, wireless technology, and satellite. Học viện mạng Bach Khoa - Website: www.bkacad.com 6 • Soon, voice over IP (VoIP) and videoconferencing components will become expected parts of the teleworkers toolkit. • Home Office Components - The required home office components are a laptop or desktop computer, broadband access (cable or DSL), and a VPN router or VPN client software installed on the computer. Additional components might include a wireless access point. When traveling, teleworkers need an Internet connection and a VPN client to connect to the corporate network over any available dialup, network, or broadband connection. • Corporate Components - Corporate components are VPN-capable routers, VPN concentrators, multifunction security appliances, authentication, and central management devices for resilient aggregation and termination of the VPN connections. The Teleworker Solution Học viện mạng Bach Khoa - Website: www.bkacad.com 7 Broadband Services Học viện mạng Bach Khoa - Website: www.bkacad.com 8 Connecting Teleworkers to the WAN • The choice of access network technology and the need to ensure suitable bandwidth are the first considerations to address when connecting teleworkers. Học viện mạng Bach Khoa - Website: www.bkacad.com 9 Connecting Teleworkers to the WAN Học viện mạng Bach Khoa - Website: www.bkacad.com 10 Cable [...]... viện mạng Bach Khoa - Website: www.bkacad.com 11 Cable Học viện mạng Bach Khoa - Website: www.bkacad.com 12 Cable • • The Data-over-Cable Service Interface Specification (DOCSIS) is an international standard developed by CableLabs, a non-profit research and development consortium for cable-related technologies DOCSIS specifies the OSI Layer 1 and Layer 2 requirements: – Physical layer - For data signals... 400 kHz, 800 kHz, 1 .6 MHz, 3.2 MHz, and 6. 4 MHz DOCSIS also specifies modulation techniques (the way to use the RF signal to convey digital data) – MAC layer - Defines a deterministic access method, time-division multiple access (TDMA) or synchronous code division multiple access method (S-CDMA) Học viện mạng Bach Khoa - Website: www.bkacad.com 13 Cable Học viện mạng Bach Khoa - Website: www.bkacad.com... satellite Internet systems are used for IP multicast-based data, audio, and video distribution Even though most IP protocols require two-way communication, for Internet content, including web pages, one-way satellite-based Internet services can be "pushed" pages to local storage at end-user sites by satellite Internet Full interactivity is not possible 2 One-way terrestrial return satellite Internet systems... multiple-input multiple-output (MIMO) The 802. 16 (or WiMAX) standard allows transmissions up to 70 Mb/s, and has a range of up to 30 miles (50 km) It can operate in licensed or unlicensed bands of the spectrum from 2 to 6 GHz Học viện mạng Bach Khoa - Website: www.bkacad.com 27 Broadband Wireless solution Học viện mạng Bach Khoa - Website: www.bkacad.com 28 VPN Technology Học viện mạng Bach Khoa - Website:... device Học viện mạng Bach Khoa - Website: www.bkacad.com 25 Broadband Wireless • • Satellite Internet services are used in locations where land-based Internet access is not available, or for temporary installations that are continually on the move There are three ways to connect to the Internet using satellites: one-way multicast, oneway terrestrial return, and two-way 1 One-way multicast satellite Internet... Bach Khoa - Website: www.bkacad.com 16 DSL • The two key components are the DSL transceiver and the DSLAM: – Transceiver - Connects the computer of the teleworker to the DSL Usually the transceiver 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 home office use – DSLAM - Located... confidentiality and security Học viện mạng Bach Khoa - Website: www.bkacad.com 30 VPNs and Their Benefits • • • • Consider these benefits when using VPNs: Cost savings - Organizations can use cost-effective, third-party Internet transport to connect remote offices and users to the main corporate site This eliminates expensive dedicated WAN links and modem banks Security - Advanced encryption and authentication... mạng Bach Khoa - Website: www.bkacad.com 15 DSL • • • • • DSL is a means of providing high-speed connections over installed copper wires Several years ago, Bell Labs identified that a typical voice conversation over a local loop only required bandwidth of 300 Hz to 3 kHz Advances in technology allowed DSL to use the additional bandwidth from 3 kHz up to 1 MHz to deliver high-speed data services over... Located at the CO of the carrier, the DSLAM combines individual DSL connections from users into one high-capacity link to an ISP, and thereby, to the Internet Học viện mạng Bach Khoa - Website: www.bkacad.com 17 DSL • • The major benefit of ADSL is the ability to provide data services along with POTS voice services ADSL signals distort voice transmission and are split or filtered at the customer premises... Khoa - Website: www.bkacad.com 20 Broadband Wireless • • • Broadband access by ADSL or cable provides teleworkers with faster connections than dialup, but until recently, SOHO PCs had to connect to a modem or a router over a Cat 5 (Ethernet) cable Wireless networking, or Wi-Fi (wireless fidelity), has improved that situation, not only in the SOHO, but on enterprise campuses as well The benefits of Wi-Fi . channel) as 200 kHz, 40 0 kHz, 800 kHz, 1 .6 MHz, 3.2 MHz, and 6 .4 MHz. DOCSIS also specifies modulation techniques (the way to use the RF signal to convey digital data). – MAC layer - Defines a. 1 Chapter 6 - Teleworker Services CCNA Exploration 4. 0 Học viện mạng Bach Khoa - Website: www.bkacad.com 2 Introduction Học viện mạng Bach Khoa - Website: www.bkacad.com. connecting teleworkers. Học viện mạng Bach Khoa - Website: www.bkacad.com 9 Connecting Teleworkers to the WAN Học viện mạng Bach Khoa - Website: www.bkacad.com 10 Cable Học viện mạng Bach Khoa - Website: