CCNA 4 Chapter 1 v6 Exam Answers

Which WAN technology is cell-based and well suited to carry voice and video traffic?

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 network scenario will require the use of a WAN?

When traveling employees need to connect to a corporate email server through a WAN connection, the VPN will create a secure tunnel between an employee laptop and the corporate network over the WAN connection. Obtaining dynamic IP addresses through DHCP is a function of LAN communication. Sharing files among separate buildings on a corporate campus is accomplished through the LAN infrastructure. A DMZ is a protected network inside the corporate LAN infrastructure.

Match the type of WAN device or service to the descriptions. (Not all options are used.)

What is an advantage of packet-switched technology over circuit-switched technology?

Packet switching does not require a circuit to be established and is able to route packets across a shared network. The cost of packet switching is lower than that of circuit-switching.

What can cause a reduction in available bandwidth on a cable broadband connection?

Because the local subscribers share the same cable bandwidth, as more cable modem subscribers join the service, available bandwidth may decrease.

Which geographic scope requirement would be considered a distributed WAN scope?

In a business context, a one-to-one scope would encompass a corporation that has a single branch office. A one-to-many WAN scope would encompass a corporation with multiple branch offices. A distributed WAN would have many branch offices connected to many other sites.

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 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.

A company needs to interconnect several branch offices across a metropolitan area. The network engineer is seeking a solution that provides high-speed converged traffic, including voice, video, and data on the same network infrastructure. The company also wants easy integration to their existing LAN infrastructure in their office locations. Which technology should be recommended?

Ethernet WAN uses many Ethernet standards and it connects easily to existing Ethernet LANs. It provides a switched, high-bandwidth Layer 2 network capable of managing data, voice, and video all on the same infrastructure. ISDN, while capable of supporting both voice and data, does not provide high bandwidth. VSAT uses satellite connectivity to establish a private WAN connection but with relatively low bandwidth. Use of VSAT, ISDN, and Frame Relay require specific network devices for the WAN connection and data conversion between LAN and WAN.

Which connectivity method would be best for a corporate employee who works from home two days a week, but needs secure access to internal corporate databases?

VPNs are used by companies for site-to-site connectivity and by remote users to connect securely into the corporate network by the use of VPN client software.

What is a requirement of a connectionless packet-switched network?

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.

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Which statement describes a characteristic of a WAN?

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.

Which two devices are needed when a digital leased line is used to provide a connection between the customer and the service provider? (Choose two.)

Digital leased lines require a channel service unit (CSU) and a data service unit (DSU). An access server concentrates dialup modem dial-in and dial-out user communications. Dialup modems are used to temporarily enable the use of analog telephone lines for digital data communications. A Layer 2 switch is used to connect a LAN.

What are two common types of circuit-switched WAN technologies? (Choose two.)

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.

A corporation is looking for a solution to connect multiple, newly established remote branch offices. Which consideration is important when selecting a private WAN connection rather than a public WAN connection?

A private WAN solution that involves dedicated links between sites offers the best security and confidentiality. Both private and public WAN solutions offer comparable connection bandwidth, depending on the technology chosen. Connecting multiple sites with private WAN connections could be very expensive. The website and file exchange service support is not relevant.

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?

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.

What is the recommended technology to use over a public WAN infrastructure when a branch office is connected to the corporate site?

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.

Which feature is used when connecting to the Internet using DSL?

Long-Term Evolution (LTE) is used with cellular networks. IEEE 802.16 is used by WiMAX networks which provide high-speed broadband wireless service. The cable modem termination system (CMTS) is used by cable networks. A DSL access multiplexer (DSLAM) is used at an Internet provider location to connect multiple subscriber lines to the provider network.

Which solution can provide Internet access to remote locations where no regular WAN services are available?

VSAT provides Internet access through satellites, which is a solution for remote areas. WiMAX and municipal Wi-Fi are used to provide Internet connections in a metropolitan area. Ethernet is a LAN technology.

Which two technologies use the PSTN network to provide an Internet connection? (Choose two.)

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.

What are two common high-bandwidth fiber-optic media standards? (Choose two.)

ATM (Asynchronous Transfer Mode) is a Layer 2 technology. ANSI (American National Standards Institute) and ITU (international Telecommunication Union) are standards organizations.

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What is a long distance fiber-optic media technology that supports both SONET and SDH, and assigns incoming optical signals to specific wavelengths of light?

ISDN (Integrated Services Digital Network), ATM (Asynchronous Transfer Mode), and MPLS (Multiprotocol Label Switching) do not describe optic fiber technologies.

Match the connectivity type to the description. (Not all options are used.)

Which equipment is needed for an ISP to provide Internet connections through cable service?

The equipment located at a cable service provider office, the cable modem termination system (CMTS), sends and receives digital cable modem signals on a cable network to provide Internet services to cable subscribers. A DSLAM performs a similar function for DSL service providers. A CSU/DSU is used in leased line connections. Access servers are needed to process multiple simultaneous dial-up connections to a Central Office (CO).

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.)

VPNs over the Internet provide low cost, secure connections to remote users. VPNs are deployed over the Internet public infrastructure.

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?

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.

Which wireless technology provides Internet access through cellular networks?

LTE or LongTerm Evolution is a fourth-generation cellular access technology that supports Internet access.

Which WAN technology establishes a dedicated constant point-to-point connection between two sites?

A leased link establishes a dedicated constant point-to-point connection between two sites. ATM is cell-switched. ISDN is circuit-switched. Frame Relay is packet-switched.