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| 1 | |
When an analog sound is converted into 8-bit chunks 8000 times a second, this 64 kilobit per second data stream is created. |
| | A) | DS0 |
| | B) | DS1 |
| | C) | E1 |
| | D) | T1 |
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| 2 | |
What exists at both ends of a T1 connection? |
| | A) | A frame relay |
| | B) | A CSU/DSU |
| | C) | A digital trunk |
| | D) | A multiplexer |
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| 3 | |
This frame type consists of a single framing bit and 24 data channels, each holding an 8-bit DS0 sample, for a total of 193 bits. |
| | A) | DS1 |
| | B) | T1 |
| | C) | T3 |
| | D) | SONET |
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| 4 | |
Which line consists of 672 DS0 channels for a total throughput of 43 Mbps? |
| | A) | T1 |
| | B) | T3 |
| | C) | E1 |
| | D) | E3 |
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| 5 | |
Which standard supports a throughput of up to 39.8 Gbps? |
| | A) | ISDN |
| | B) | VDSL |
| | C) | SONET |
| | D) | MPLS |
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| 6 | |
If you purchase a T1 line in the United States, how will packets be switched? (Select two.) |
| | A) | OC |
| | B) | Frame Relay |
| | C) | ATM |
| | D) | BERT |
| | E) | Answers A, B |
| | F) | Answers B, C |
| | G) | Answers C, D |
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| 7 | |
What describes the problem with “the last mile”? |
| | A) | The connection from a central office to a user’s home is analog whereas the rest of the network is digital. |
| | B) | Users must live within a mile of a central office in order to guarantee quality of service (QoS). |
| | C) | SONET connections are limited to a maximum distance of one mile, and connecting central offices via multiplexers is expensive and difficult to maintain. |
| | D) | Copper wires that carry analog telephone signals are limited to a maximum distance of one mile. |
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| 8 | |
What terms describe a common telephone connection? (Select two.) |
| | A) | ISDN |
| | B) | POTS |
| | C) | Fractional T1 |
| | D) | PSTN |
| | E) | Answers A, B |
| | F) | Answers B, D |
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| 9 | |
What marks where the telephone company’s responsibility ends and yours begins? |
| | A) | Multiplexer |
| | B) | Demarc |
| | C) | Primary Rate Interface |
| | D) | Bridges connection |
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| 10 | |
The CCITT established which set of standards? |
| | A) | Optical Carrier (OC) |
| | B) | DSL (ADSL, SDSL, VDSL) |
| | C) | Data Over Cable Service Interface Specification (DOCSIS) |
| | D) | V standards |
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| 11 | |
Which is the fastest ISDN connection? |
| | A) | BERT |
| | B) | BRI |
| | C) | PRI |
| | D) | ATM |
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| 12 | |
Sinjay is 200 meters from his ISP’s DSLAM. Which DSL version will provide him with up to 100 Mbps of both download and upload speed? |
| | A) | DS3 |
| | B) | ADSL |
| | C) | SDSL |
| | D) | VDSL |
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| 13 | |
Which protocol is used by cable companies? |
| | A) | MPLS |
| | B) | DOCSIS |
| | C) | PSTN |
| | D) | SIP |
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| 14 | |
What is the benefit to using a satellite connection? |
| | A) | It offers speeds faster than both DSL and cable. |
| | B) | The upload and download speeds are always equal. |
| | C) | It is often available in remote locations where DSL and cable are not. |
| | D) | If offers better security than both DSL and cable. |
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| 15 | |
Which protocols support multicasting on VoIP networks? |
| | A) | SIP |
| | B) | H.323 |
| | C) | RTP |
| | D) | RAS |
| | E) | Answers A, B |
| | F) | Answers B, C |
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