| At which two layers of the OSI model does a WAN operate? (Choose two.) | |
| Physical Layer | |
| Data Link Layer | |
| Network Layer | |
| Transport Layer | |
| Presentation Layer | |
| Application Layer | |
| Which three WAN devices can be found in the cloud? (Choose three.) | |
| Ethernet switches | |
| Frame Relay switches | |
| ATM switches | |
| bridges | |
| core routers | |
| repeaters | |
| Which networking device is typically used to concentrate the dial-in and dial-out traffic of multiple users to and from a network? | |
| core router | |
| access server | |
| Frame Relay switch | |
| ATM switch | |
| Which packet-switched WAN technology offers high-bandwidth connectivity capable of managing data, voice, and video all on the same infrastructure? | |
| Time Division Multiplexing (TDM) | |
| metro Ethernet | |
| Integrated Services Digital Network (ISDN) | |
| Public Switched Telephone Network (PSTN) | |
| What are three advantages of permanent dedicated circuits over shared lines such as Frame-Relay? (Choose three.) | |
| dedicated bandwidth capacity | |
| eliminates latency and jitter between endpoints | |
| low cost of implementation | |
| connections can be multiplexed over the same leased line | |
| each endpoint has a dedicated physical router interface | |
| eliminates point-to-point connections | |
| Which three features are identified with Frame Relay connections? (Choose three.) | |
| CIR | |
| DLCI | |
| DSLAM | |
| PVC | |
| SPID | |
| 53-byte cells | |
| Which WAN technology uses a fixed payload of 48 bytes and is transported across both switched and permanent virtual circuits? | |
| ATM | |
| ISDN | |
| Frame Relay | |
| metro Ethernet | |
| What are two advantages of an analog PSTN WAN connection? (Choose two.) | |
| low cost | |
| availability | |
| traffic encryption | |
| available bandwidth | |
| support for voice and video | |
| What three technologies are associated with ISDN PRI? (Choose three.) | |
| DLCI | |
| circuit switching | |
| packet switching | |
| data bearer channels | |
| switched virtual circuits | |
| time division multiplexing | |
| What can cause a reduction in available bandwidth on a cable broadband connection? | |
| smaller cells | |
| number of subscribers | |
| committed information rate | |
| distance from the central office of the provider | |
| Virtual private networks (VPNs) use what type of connection from the remote site to the private network? | |
| PVCs | |
| DLCIs | |
| tunnels | |
| virtual circuits | |
| dedicated Layer 2 links | |
| Which WAN technology allows telecommunication companies to offer enterprises services such as storage area networking, secure Layer 2 and Layer 3 VPNs, and disaster recovery on public networks? | |
| DSL | |
| ATM | |
| ISDN | |
| metro Ethernet | |
| A U.S. company requires a WAN connection used only to transfer sales data from individual stores to the home office. All transfers will occur after business hours. The required bandwidth for this connection is estimated to be less than 38 kbps. Which type of connection requires the least investment for this company? | |
| ATM | |
| ISDN | |
| analog dialup | |
| T1 Leased Line | |
| Which device is used to establish the communications link between the customer equipment and the local loop for digital lines? | |
| terminal adapter | |
| modem | |
| CSU/DSU | |
| PBX switch | |
| ISDN switch | |
| Frame Relay Switch | |
| Which term describes a device that will put data on the local loop? | |
| DLCI | |
| CO | |
| DCE | |
| DTE | |
| PRI | |
| BRI | |
| Which switching type will allow the communication devices in the provider's network to be shared and only allocated to an individual subscriber during data transfer? | |
| circuit-switched | |
| packet-switched | |
| frame-switched | |
| dedicated-switched lines | |
| lease-switched | |
| A company needs a WAN connection that is capable of transferring voice, video, and data at a minimum data rate of 155 Mbps. Which WAN connection is the best choice? | |
| X.25 | |
| DSL | |
| ATM | |
| ISDN BRI | |
| ISDN PRI | |
|
| |
| time-division multiplexing (TDM) | |
| signaling | |
| X.25 | |
| ISDN BRI | |
| Which two devices are commonly used as data communications equipment? (Choose two.) | |
| modem | |
| router | |
| CSU/DSU | |
| ISDN switch | |
| Ethernet switch | |
