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Ch. 16 chapter review

QuestionQuestionAnswerAnswer
3. if you have a device in a telecommunications closet owned and installed by telecommunications company (telco) and it's your responsibility to cable from this box to the CPE, which term should you use to refer to the device? 3. a. customer premises equipment b. demarcation point c. toll network d. central office 3. B. The demarcation point is the precise spot where the service provider's responsibility ends and the CPE begins. 3
4. you have an E1. How many DS0s are used in this point-to-point connection? a. 24 b. 25 c. 30 d. 32 4 4. C. The European version of the T1 is the E1, which operates at 2.048Mbps and uses 30 64Kbps channels (30 DS0s). 4
5. where does the local exchange carrier responsibility end and your responsibility begin on a WAN link? A. POP B. Central office C. Demarc D. Smart jack 5 5. C. The demarc is the precise spot where the service provider's (local exchange carrier) responsibility ends and the CPE begins. it's generally a device in a telecommunications closet owned and installed by the telecommunications company (telco). 5
6. you have a small office, home office environment.what WAN technology would most likely be used? A. T1 B. T3 C. Frame Relay D. Cable Modem 6 6. D. Cable is a great cost-effective connection for a small office or home office (SOHO). 6
7. which type of communication has a line speed of 1.544 Mbps (millions of bits per second)? A. T3 B. T1C C. T1 D. T4 7 7. C. A T1 has a line speed of 1.544Mbps.This 1.544Mbps connection uses Digital Signal 1 (DS1) and aggregates 24 discrete 64 Kbps channels that use Digital Signal 0 (DS0). other T-series connections have greater maximum connection speeds. 7
8. Which cellular WAN technology has the best data rate? A. HSPA B. HSPA+ C. LTE D. WiMAX 8 8. C. LTE is true 4G and has the best data rates. 8
9. Which is not a common optical carrier level (OC-x) A. OC-1 B. OC-4 C. OC-12 D. OC-192 9 . B. OC-1, OC-3, OC-12, OC-48, OC-192 are the normal service offerings. OC-1 has the lowest data rate at 51.84Mbps, and OC-192 is the highest at 9.953Gbps. 9
10. Which wireless protocol utilizes a short-range communications technology facilitating data transmission from fixed and/or mobile devices, creating wireless personal area networks (PANs)? 10. A. Bluetooth B. Microwave radio relay c. comsat d. point-to-multipoint 10. A. Bluetooth uses a radio technology called frequency hopping spread spectrum. it chops up the data being sent and transmits chunks of it through the air on up to 75 different frequencies. 10
11. what does the x in xDSL represent? A. Wire type b. transmission speed c. DSL type d. download speed 11 11. C. The x in xDSL represents the different letters that refer to the DLS flavors. xDSL use high-frequency signals, whereas regular phone calls use low-frequency signals over the same lines. 11
12. which is not a type of xDSL? A. ADSL B. HDSL C. SONET D. SDSL 12 12. C. ADSL,HDSL, SDSL,VDSL, or VHDSL and VDSL2 are all common xDSL types. Synchronous Optical Network (SONET) is the standard for synchronous data transmission on optical fiber. 12
13. What is the acronym DOCSIS stand for? a. data over cable service interface spectrum b. data over cable systems internet specification c. data over cable service internet specification d. data over cable service interface specification 13 13. D. DOCSIS stands for data over cable service interface specification. all cable modems and like devices have to measure up to this standard. 13
14. what is the bandwidth for OC-12? A. 1.544 Mbps B. 45 Mbps C. 622 Mbps D. 1000 Mbps 14 14. C. Optical carrier 12 has speeds up to 622 Mbps. 14
15. which WAN protocol utilizes cell-switching technology? a. frame relay b. ISDN C. ATM D. RIP 15 15. C. ATM uses a high-speed cell-swithcing technology that can handle data as well as realtime voice and video.The ATM protocol breaks up transmitted data into 53-byte cells. 15
16. Which WAN protocol utilizes packet-switched technology? a. frame relay b. ISDN C. ATM D. RIP 16 16. A. Frame Relay is the frame WAN technology in which variable-length packets are transmitted by switching. 16
17. What is the CIR in Frame Relay? a. virtual circuit that is established when data needs to be transmitted b. maximum speed at which the frame relay interface can transmit c. rate at which the frame relay switch guarantees to transfer data 17. d. rate at which the frame relay switch agrees to receive data 17. C. The committed information rate (CIR) is the rate, in bits per second, at which the Frame Relay switch guarantees to transfer data. 17
18. what does the acronym ATM stand for? A. Automated Teller Machine B. Asynchronous Transfer Mode C. Asynchronous Transfer Method D. Autonomous Transfer Mode 18 18. B. We're thinking in terms of a WAN, so B is obviously the correct choice.asynchronous Transfer Mode was designed to be a high-speed communications protocol that does not depend on any specific LAN topology. 18
19. which WAN has a transfer rate of 44.7 Mbps? A. T1 B. T3 C. E1 D. E3 19 19. B. A T3 line works similarly to a T1 connection but carries a whopping 44.736Mbps. this is equivalent to 28 T1 circuits (or a total of 672 DS0 channels), and it uses a signal known as Digital Signal 3 (DS3). 19
20. How does DWDM put multiple transmissions on a single strand? a. different frequencies b. different polarizations c. different wavelengths d. different time slots 20 20. C. Wavelength Division Multiplexing (WDM) is a technology that multiplexes multiple optical carriers on a single optical fiber by using different wavelengths. 20
1. Which of the following is not a WAN protocol or technology? A. ATM B. ISDN C. MPLS D. RIP 1 1. D. Routing Info Protocol (RIP) is not a WAN protocol but a routing protocol used in internetworks 1
2. What OSI model layers do WAN protocols operate in? a. layer 6, layer 4, layer 2 b. transport,data link, network c. physical, data link, network d. application, data link, network 2 2. C. These different protocols and technologies all occupy the lower three layers of the OSI model: the Physical layer, the Data Link layer, and sometimes the Network layer. most WANs protocols work only at the Physical layer and Data Link layer. 2
Created by: baumsquad
 

 



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