CCIE Written, Service Provider: DSL : 350-022 Exam

Exam Number/Code: 350-022
Exam Name:CCIE Written, Service Provider: DSL

“CCIE Written, Service Provider: DSL”, also known as 350-022 exam, is a Cisco certification. With the complete collection of questions and answers, Actualtests has assembled to take you through 400 Q&As to your 350-022 Exam preparation. In the 350-022 exam resources, you will cover every field and category in CCIE helping to ready you for your successful Cisco Certification.
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QUESTION 11:
Your boss at Certkiller .com is curios about DSL. What is true concerning interleaved
versus fastpath mode in DMT DSL service?
A. Fastpath mode allows higher DSL rates.
B. Interleaved mode allocates traffic to more than one ATM PVC
C. Interleaved mode allows greater forward error correction (FEC).
D. Fastpath mode gives data precedence over voice traffic.
Answer: C
QUESTION 12:
Your boss at Certkiller .com is curios about DSL. What is the use of a VC class in IOS
configuration?
A. It defines a template for virtual circuits which can be applied to a(sub)interfaces such that all
PVCs on that (sub)interface which will inherit the configuration from that template.
B. It defines various priorities for the PVCs to enable priority queing of cells transmitted on a
sub(interface).
C. It is another name for Virtual Paths.
D. It is used to classify incoming cells on a physical interface as CBR/ABR/ and UBR traffic.
E. It defines a template for switching ATM pvcs from one interface to another.
Answer: A
QUESTION 13:
You work as a network administrator at Certkiller .com. A DSL subscriber reports that the
CPE modem untrains and retrains several times each hour, but tot at regular intervals.
The subscriber has a DMT modem operating on 10 kft of #26 cable (3 km of 0.4 mm cable).
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The provisioned downstream rate is 2 mbps, and the provisioned upstream rate is 256
kbps. When the modem retrains, the downstream DLS 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? Select
two
A. A telephone on the same phone line was installed without a microfilter. When the telephone
handset is take 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.
B. There is an interfering signal in the same cable. When the interfering signal is present, an
excessive error rate results. The modem retrains at a lower line rate in order to recover an
acceptable noise margin and error rate.
C. The noise margin was incorrectly set too high. Reducing the noise margin will correct the
symptom.
D. ADSL DMT will not permit 2 mbps downstream rates at 10 kft of #26 cable (3 km of 0.4 mm
cable). ADSL 2 megabit service will always be unreliable and intermittent on this cable length
and wire size.
E. The DMT profile is using interleaved mode. Changing to fastpath will correct the symptom.
F. The ATM QoS is UBR, and the subscriber’s traffic is yielding to VBR or CBR traffic.
Answer: A, B
QUESTION 14:
Your boss at Certkiller .com is curios about DSL. What is true concerning fastpath versus
interleaved mode in DMT DLS service?
A. Fastpath mode provides lower latency (delay) than interleaved mode.
B. Fastpath mode allows higher DSL trained rates.
C. Fastpath mode allows higher effective throughput on noisy transmission lines.
D. Interleaved mode ensures that all provisional ATM PVCs on a DSL line are given equal
bandwidth.
Answer: A
QUESTION 15:
Your boss at Certkiller .com is curios about DSL. The purpose of Administrative Distance,
as used by Cisco routers, is….
A. To choose between routes from different routing protocols when receiving updates for the
same network.
B. To identify which routing protocol forwarded the update.
C. To define the distance to the destination used in deciding the best path.
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D. To be used only for administrative purposes
Answer: A
QUESTION 16:
Your boss at Certkiller .com is curios about DSL. What is the effect of changing DMT
interleaved delay from 16 milliseconds to 2 milliseconds?
A. Fewer ATM PVCs can be provisioned on the DSL line.
B. Latency is reduced, but error correction effectiveness may also be reduced.
C. Latency remains the same, but faster error correction occurs.
D. Latency remains the same, but throughput is increased
Answer: B
QUESTION 17:
Your boss at Certkiller .com is curios about DSL. What ADSL DMT line rate requires
(occupies) the most bandwidth on a telephone line?
A. 8 mbps downstream, 800 kbps upstream on 1 kft (300 meters) of cable.
B. 8 mbps downstream, 800 kbps upstream on 9 kft (2.75 km) of cable.
C. 1 mbps downstream, 256 kbps upstream on 1 kft (300 meters) of cable.
D. 512 kbps downstream, 128 kbps upstream on 17 kft (5.2 km) of cable.
Answer: A
QUESTION 18:
You work as a network engineer at Certkiller .com. 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 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 probably cause of this symptom?
A. An improper DSL line rate was provisioned for shared lines.
B. A microfilter or splitter was not correctly installed between the telephone and the line.
C. The noise level on the telephone line will not allow DSL and POTS voice at the same time.
D. An incorrect DMT operating mode was provisioned in the DSLAM.
Answer: B
QUESTION 19:
350-022
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Network topology exhibit
You work as a network engineer at Certkiller .com. Host Certkiller 1 and Host Certkiller 2 are
on Ethernet LANs in different buildings. A serial line is installed between two Cisco routers
using Cisco HDLC serial line encapsulation. Routers Certkiller A and Certkiller B are
configured to route IP traffic. Host Certkiller 1 sends a packet to Host Certkiller 2. A line hit
on the serial line causes an error in the packet.
When this is detected, the retransmission is sent by:
A. Host Certkiller 1
B. Host Certkiller 2
C. Router Certkiller A
D. Router Certkiller B
E. Protocol analyzer
Answer: A
QUESTION 20:
Exhibit
You work as a network engineer at Certkiller .com. 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 upstreams RS uncorrected errors are occurring on the DSL
line, as reported by the DSLAM in the status message shown in the exhibit.
What is the result of the uncorrected errors?
A. The DSL frames will be continuously retransmitted by the DSL transceivers until an
error-free frame is received.
B. If errors on the DSL line can not be corrected by the RS algorithm, the line will be
automatically taken out of service.
C. The errored data resulting from uncorrected layer-1 errors will be handled by TCP.
D. When Reed-Solomon forward error correction is used, all errors are corrected at layer 1. The
uncorrected state was present only until forward error correction algorithms corrected the errors.
Answer: C

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