Cisco CCIE Service Provider DSL Set 10

Question - 15 Maximum mark : - 28

Home
All Exams
Cisco CCIE Service Provider DSL Online Practice Exams
Cisco CCIE Service Provider DSL Set 10

A DSL subscriber reports that the CPE modem untrains and retrains several times each hour, but not at regular intervals. The subscriber has a DMT modem operating on 10 kft of #26 cable (3 km of 0.4 mm cable). The provisioned downstream rate is 2 mbps, and the provisioned upstream rate is 256 kbps. When the modem retrains, the downstream DSL may be as low as 512 kbps. Sometimes manually retraining the modem allows it to return to a 2 mbps line rate, and sometimes manually retraining the modem does not improve the DSL line rate. Which options would cause the intermittent train/untrain symptom as described? (multiple answer)

A telephone on the same phone line was installed without a microfilter. When the telephone handset is taken off-hook, the phone causes excessive attenuation of the DSL frequencies and the resulting high error rate results in a retrain. Because of the degraded signal levels while the phone is off-hook, the modem can not retrain at 2 mbps. There is an interfering signal in the same cable. When the interfering signal is present, an excessive errorrate results. The modem retrains at a lower line rate in order to recover an acceptable noise margin and error rate. The noise margin was incorrectly set too high. Reducing the noise margin will correct the symptom. ADSL DMT will not permit 2 mbps downstream rates at 10 kft of #26 cable (3 km of 0.4 mm cable). ADSL 2megabit service will always be unreliable and intermittent on this cable length and wire size. The DMT profile is using interleaved mode. Changing to fastpath will correct the symptom.

Answer & Solution Discuss in Board Save for Later

Answer & Solution

Answer: Option B

Solution:

It provides fallback for IE8.

What is not a valid service type between an 827 and a 6400?

PPPoA ✘ HDLC ✘ PPPoE ✘ L2TP ✔ RFC1483 ✔

Answer & Solution Discuss in Board Save for Later

Answer & Solution

Answer: Option B

Solution:

It provides fallback for IE8.

A DSLAM is using Reed-Solomon forward error correction on a DMT DSL line. The DSL service is using TCP/ IP over ATM over DSL. A high number of upstream RS uncorrected errors are occurring on the DSL line, as
reported by the DSLAM in the following status message:DSL Statistics:Init Events: 2Transmitted Superframes:
near end: 93681573 far end: 0Received Superframes:
near end: 93516422 far end: 0Corrected Superframes: near end: 142631 far end: 31571Uncorrected
Superframes: near end: 191 far end: 1LOS Events: near end: 0 far end: 0LOF/RFI Events: near end: 0 far end:
0ES Events: near end: 5 far end: 1What is the result of the uncorrected errors?

The DSL frames will be continuously retransmitted by the DSL transceivers until an error-free frame is
received. ✘ If errors on the DSL line can not be corrected by the RS algorithm, the line will be automatically taken out ofservice. ✘ The errored data resulting from uncorrected layer-1 errors will be handled by TCP. ✘ When Reed-Solomon forward error correction is used, all errors are corrected at layer 1. The uncorrectedstate was present only until forward error correction algorithms corrected the errors. ✔

Answer & Solution Discuss in Board Save for Later

Answer & Solution

Answer: Option B

Solution:

It provides fallback for IE8.

In ADSL DMT systems, the highest downstream transmit power occurs at what rate/reach combinations?

384 kbps at 17 kft (5.1 km) ✘ 8 mbps at 1 kft (305 meters) ✘ 1 mbps at 9 kft (2.75 km) ✘ 8 mbps at 9 kft (2.75 km) ✔

Answer & Solution Discuss in Board Save for Later

Answer & Solution

Answer: Option B

Solution:

It provides fallback for IE8.

What ADSL DMT line rate requires (occupies) the most bandwidth on a telephone line?

8 mbps downstream, 800 kbps upstream on 1 kft (300 meters) of cable. ✘ 8 mbps downstream, 800 kbps upstream on 9 kft (2.75 km) of cable. ✘ 1 mbps downstream, 256 kbps upstream on 1 kft (300 meters) of cable. ✘ 512 kbps downstream, 128 kbps upstream on 17 kft (5.2 km) of cable. ✔

Answer & Solution Discuss in Board Save for Later

Answer & Solution

Answer: Option B

Solution:

It provides fallback for IE8.

Which modulation techniques are typical of ADSL, but not SDSL, SHDSL, or IDSL?

CAP and DMT ✘ TC/PAM and DMT ✘ CAP and TC/PAM ✘ CAP and 2B1Q ✔

Answer & Solution Discuss in Board Save for Later

Answer & Solution

Answer: Option B

Solution:

It provides fallback for IE8.

The major difference between DMT and CAP is:

CAP uses a single center frequency; DMT is multiple-carrier. ✘ DMT is single-carrier; CAP is multiple-carrier. ✘ CAP is used in IDSL; DMT is used in ADSL. ✘ DMT is used in VDSL; CAP is used in ADSL. ✔ CAP is used in ADSL, DMT is used in SDSL. ✔

Answer & Solution Discuss in Board Save for Later

Answer & Solution

Answer: Option B

Solution:

It provides fallback for IE8.

A DSL subscriber says that his DSL modem is trained at the subscribed rates, 1024 kbps downstream and 256 kbps upstream, but he has no access to the internet. The internet service was working until today. The modem
remains trained - it is not dropping train or frequently retraining. Manually retraining the modem does not correct the problem. The customer can ping from his PC to the Ethernet interface on the DSL modem, but not
addresses "in the network". Initial troubleshooting shows that the DSL modem can ping the subscriber's PC, but no addresses in the network. What could cause this problem?

A telephone is connected to the DSL line with no microfilter or splitter installed. The phone is "loading" the
line and disrupting DSL service. ✘ The subscriber powered-down the DSL modem, and when it was powered-up it defaulted to G.Lite mode(G.992.2). The port in the DSLAM is full-rate DMT (G.992.1). ✘ The DSL port in the DSLAM was left in a "shutdown" state by mistake following DSLAM maintenance. ✘ There is a problem with the subscriber's ATM PVC between the DSLAM and ATM switch. An incorrect VCIwas assigned between the DSLAM and ATM switch shortly after midnight, during the service provider's
network rearrangements. ✔

Answer & Solution Discuss in Board Save for Later

Answer & Solution

Answer: Option B

Solution:

It provides fallback for IE8.

What is true concerning fastpath versus interleaved mode in DMT DSL service?

Fastpath mode provides lower latency (delay) than interleaved mode. ✘ Fastpath mode allows higher DSL trained rates. ✘ Fastpath mode allows higher effective throughput on noisy transmission lines. ✘ Interleaved mode ensures that all provisioned ATM PVCs on a DSL line are given equal bandwidth. ✔

Answer & Solution Discuss in Board Save for Later

Answer & Solution

Answer: Option B

Solution:

It provides fallback for IE8.

10.

IDSL and SDSL use what line coding scheme?

B8ZS ✘ 2B1Q ✘ QAM ✘ CAP ✔ DMT ✔

Answer & Solution Discuss in Board Save for Later

Answer & Solution

Answer: Option B

Solution:

It provides fallback for IE8.

Prev Next

Congratulations

you have successfully completed the test

Back to Question View Result

Detail Form

We will send your result on your email id and phone no. please fill detail

Name

Email ID Note: Report will be send to the above Email ID

Phone No

Cisco CCIE Service Provider DSL Set 10

Answer & Solution

Answer: Option B

Solution:

Answer & Solution

Answer: Option B

Solution:

Answer & Solution

Answer: Option B

Solution:

Answer & Solution

Answer: Option B

Solution:

Answer & Solution

Answer: Option B

Solution:

Answer & Solution

Answer: Option B

Solution:

Answer & Solution

Answer: Option B

Solution:

Answer & Solution

Answer: Option B

Solution:

Answer & Solution

Answer: Option B

Solution:

Answer & Solution

Answer: Option B

Solution:

Congratulations

COMPANY

Products

OTHERS

Partner