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Category: 350-022

CCIE Service Provider DSL Exam

Which three of the following statements describes the possible effect of placing bride-taps on a DSL line?

The telephone company has placed a bridge-tap (half-tap) on all the pairs in a cable in preparation to reroute the cable. DSL customers are served by this cable. Three of the following five statements are correct. Which three of the following statements describes the possible effect of placing bride-taps on a DSL line? (multiple answer)

Which of the following is the probable cause of this symptom?

A DMT DSL modem is working on a “shared line” with standard telephone service (POTS). When the subscriber picks up the telephone handset, the DSL modem untrains, then retrains at a lower DSL line rate. When the telephone is not off-hook, the DSL modem will train at the subscribed rate (normal operation).Which of the following is the probable cause of this symptom?

which is clearly the most appropriate information needed to begin troubleshooting the problem?

A subscriber complains that his DSL rates are slower than the service he
ordered. The customer ordered ADSL at 1 mpbs downstream and 256 kbps upstream, but the maximum bitrate observed during file downloads is 100 kbps downstream. Of the following four choices, which is clearly the most appropriate information needed to begin troubleshooting the problem?

what is a possible cause of this problem?

A subscriber’s DSL service is configured as PPPoA. The subscriber’s DSL modem is trained, but the subscriber can not access the internet (can not ping network addresses or reach web servers). Initial troubleshooting shows that a PPP session is open (active) in the DSL modem and aggregator. Based on these conditions and the symptom, what is a possible cause of this problem?


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