CH 1: WAN Concepts EXAM Study guide with complete solutions.

A small company with 10 employees uses a single LAN to share information between computers. Which type of connection to the Internet would be appropriate for this company? a broadband service, such as DSL, through their local service provider For this small office, an appropriate connection to the Internet would be through a common broadband service called Digital Subscriber Line (DSL), available from their local telephone service provider. With so few employees, bandwidth is not a significant problem. If the company were bigger, with branch offices in remote sites, private lines would be more appropriate. Virtual Private Networks would be used if the company had employees who needed to connect to the company via Internet. Which statement describes a characteristic of a WAN? WAN networks are owned by service providers. WANs are used to interconnect the enterprise LAN to remote branch site LANs and telecommuter sites. A WAN is owned by a service provider. Although WAN connections are typically made through serial interfaces, not all serial links are connected to a WAN. LANs, not WANs, provide end-user network connectivity in an organization. 01:05 01:13 What are two common types of circuit-switched WAN technologies? (Choose two.) Frame Relay DSL The two most common types of circuit-switched WAN technologies are the public switched telephone network (PSTN) and the integrated services digital network (ISDN). Frame Relay and ATM are packet-switched WAN technologies. DSL is a WAN technology that offers broadband Internet access. What is a requirement of a connectionless packet-switched network? Full addressing information must be carried in each data packet. A connection-oriented system predetermines the network path, creates a virtual circuit for the duration of the packet delivery, and requires that each packet only carry an identifier. A connectionless packet-switched network, such as the Internet, requires each data packet to carry addressing information. A new corporation needs a data network that must meet certain requirements. The network must provide a low cost connection to sales people dispersed over a large geographical area. Which two types of WAN infrastructure would meet the requirements? (Choose two.) Internet private infrastructure VPNs over the Internet provide low cost, secure connections to remote users. VPNs are deployed over the Internet public infrastructure. What are two common high-bandwidth fiber-optic media standards? (Choose two.) SONET SDH Which WAN technology is cell-based and well suited to carry voice and video traffic? ATM ATM is cell-based architecture. The small and fixed cells are well-suited for carrying voice and video traffic because this traffic is intolerant of delay. Video and voice traffic do not have to wait for larger data packets to be transmitted. ISDN is circuit-switched. Frame Relay and VSAT are packet-switched. Which two technologies use the PSTN network to provide an Internet connection? (Choose two.) Frame Relay dialup Dialup and ISDN use the PSTN network to provide WAN connectivity. ATM, MPLS, and Frame Relay require the service providers to build a specific network cloud to support each technology. A customer needs a metropolitan area WAN connection that provides high-speed, dedicated bandwidth between two sites. Which type of WAN connection would best fulfill this need? Ethernet WAN MPLS can use a variety of underlying technologies such as T- and E-Carriers, Carrier Ethernet, ATM, Frame Relay, and DSL, all of which support lower speeds than an Ethernet WAN. Neither a circuit-switched network, such as the public switched telephone network (PSTN) or Integrated Service Digital Network (ISDN), nor a packet-switched network, is considered high speed. A home user lives within 10 miles (16 kilometers) of the Internet provider network. Which type of technology provides high-speed broadband service with wireless access for this home user? WiMAX WiMAX provides high-speed broadband service with wireless access and provides broad coverage. Municipal Wi-Fi is used for emergency services such as fire and police. DSL is a wired solution. 802.11 is a wireless LAN solution. What is the recommended technology to use over a public WAN infrastructure when a branch office is connected to the corporate site? VPN ISDN and ATM are Layer 1 and 2 technologies that are typically used on private WANs. Municipal WiFi is a wireless public WAN technology. Corporate communications over public WANs should use VPNs for security. What can cause a reduction in available bandwidth on a cable broadband connection? number of subscribers Because the local subscribers share the same cable bandwidth, as more cable modem subscribers join the service, available bandwidth may decrease. 00:02 01:13