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I passed with 98%, thanx to itcertkeys study guide, some questions attached here:
Question 1.
Your boss at ITCertKeys.com is curios about DSL.
What does the TCP PUSH flag indicate?
A. The data in the TCP receive buffer should be sent to the application listening to this TCP
connection without waiting for further data.
B. Any data being buffered by routers between the source and destination for this connection
should be sent immediately.
C. The sender should make certain its send buffer is pushed onto the wire.
D. The session is about to end.
Answer: A
Question 2.
Your boss at ITCertKeys.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 3.
Your boss at ITCertKeys.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 queuing 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 4.
You work as a network administrator at ITCertKeys.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).
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 5.
Your boss at ITCertKeys.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 6.
Your boss at ITCertKeys.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.
D. To be used only for administrative purposes
Answer: A
Question 7.
Your boss at ITCertKeys.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 8.
Your boss at ITCertKeys.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 9.
You work as a network engineer at ITCertKeys.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 10.
Your boss at ITCertKeys.com is curios about DSL.
In ADSL DMT systems, the highest downstream transmit power occurs at what rate/each combinations?
A. 384 kbps at 17 kft (5.1 km)
B. 8 mbps at 1 kft (305 meters)
C. 1 mbps at 9 kft (2.75 km)
D. 8 mbps at 9 kft (2.75 km)
Answer: B
Question 11.
Your boss at ITCertKeys.com is curios about DSL.
Which DSL modulation types allows line sharing (DSL and POTS voice on the same line)?
A. G.SHDSL, IDSL, and DMT
B. CAP and DMT
C. DMT and G.SHDSL
D. IDSL and SDSL
Answer: B
Question 12.
Your boss at ITCertKeys.com is curios about DSL.
What is the best definition of the use of “Area 0” in OSPF?
A. Area 0 is used for administrative reasons, and is restricted from user definition.
B. Area 0 is defined as the backbone, designed to be at the center of all routing updates, and
controls the dissemination of updates between areas.
C. Area 0 is used is used to authenticate messages received from other routers in the same area.
D. Area 0 is used for forwarding all routing updates received within the same Autonomous
System from directly connected areas only-
E. Area 0 allows for routing updates to be forwarded between different Autonomous Systems.
Answer: B
Question 13.
Your boss at ITCertKeys.com is curios about DSL.
What is the difference between AAL5 SNAP and AAL5 MUX virtual circuits?
A. AAL5 SNAP is used to carry IP packets embedded in PPP encapsulation and AAL5 MUX is
used to carry raw IP data.
B. SNAP allows multiplexing of multiple protocols over a single VC, while AAL5 MUX can carry
only one protocol per VC.
C. SNAP VCs define real time data and MUX VC defines mixed (real time and non real time) data
D. SNAP VCs are used inside public carrier network while MUX VCs are used on the edge.
E. None of he above.
Answer: B
Question 14.
Your boss at ITCertKeys.com is curios about DSL.
What is the Inter Switch Link (ISL)?
A. A protocol to interconnect switches across ATM only.
B. A protocol to interconnect switches across FDDI only.
C. An IEEE protocol to interconnect multiple switches.
D. A Cisco proprietary protocol for interconnecting multiple switches.
E. An IEEE protocol to interconnect multiple switches across FastEthernet
Answer: D
Question 15.
Your boss at ITCertKeys.com is curios about DSL.
What effect do load coils in a telephone line have on DSL service?
A. Load coils cause low trained rates for ADSL (CAP or DMT), but do not degrade SDSL,
SHDSL, or IDSL transmission.
B. Load coils in the telephone line can prevent any DSL modem from training up to an ATU-C
port.
C. Load coils cause low upstream rates, but do not degrade downstream rates.
D. Load coils cause low downstream rates, but do not degrade downstream rates.
E. Load coils cause low trained rates for SDSL, SHDSL, or IDSL, but do not degrade ADSL (CAP
or DMT) transmission.
Answer: B
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Plz send master dump with correct answers thanks buddy
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