642 321

Cisco 642-321 Cisco Optical SDH Exam 59 Q&A Version : C9.0 www.CertifyMe.com

CertifyMe - King of Computer CertificationImportant Information, Please Read CarefullyOther CertifyMe productsA) Offline Testing engineUse the offline Testing engine product to practice the questions in an exam environment.B) Study Guide (not available for all exams)Build a foundation of knowledge which will be useful also after passing the exam.Latest VersionWe are constantly reviewing our products. New material is added and old material isupdated. Free updates are available for 90 days after the purchase. You should check yourmember zone at CertifyMe and update 3-4 days before the scheduled exam date.Here is the procedure to get the latest version:1.Go towww.certifyme.com2.Click on Member zone/Log in (right side)3. Then click My Account4.The latest versions of all purchased products are downloadable from here. Just click thelinks.For most updates,it is enough just to print the new questions at the end of the new version, not thewhole document.FeedbackIf you spot a possible improvement then please let us know. We always interested inimproving product quality.Feedback should be send to feedback@certifyme.com. You should include the following:Exam number, version, page number, question number, and your login ID.Our experts will answer your mail promptly.CopyrightEach PDF file contains a unique serial number associated with your particular name andcontact information for security purposes. So if we find out that a particular PDF file isbeing distributed by you, CertifyMe reserves the right to take legal action against youaccording to the International Copyright Laws.ExplanationsThis product does not include explanations at the moment. If you are interested inproviding explanations for this exam, please contact feedback@certifyme.com. www.CertifyMe.com

1. Which timing mode is most appropriate for an ONS 15454 that has lost its BITS-1 and opticalreferences?A. line timingB. loop timingC. internal timingD. through timingE. external timingAnswer: C2. With R4.0, how many total DCC-R tunnel connections can each ONS 15454 support using the TCC+card?A. 10B. 32C. 64D. 84E. 96Answer: B3. What is the difference between 1+1 and 1:1 protection switching?A. 1+1 is based on APS, while 1:1 is based on IPS.B. 1:1 is used in SNCP switching, while 1+1 is used in MS-SPRing switching.C. 1+1 sends signals on Working and Protect paths, while 1:1 sends signals only on Working path.D. 1+1 sends signals on Working path ONLY, while 1:1 sends signals on both Working and Protect paths.Answer: C4. You are provisioning an E-1 circuit on an ONS 15454 MS-SPRing configuration and XC-VXL-10G card.Each VC-12 connection must also terminate via the VC-3 matrix. How many VC-3 ports remain after thiscircuit is created, assuming no other circuits?A. 92B. 93 www.CertifyMe.com

C. 94D. 95E. 96Answer: C5. Click the Exhibit button. In the DCN connection shown in the exhibit, all non-GNE nodes are located ondifferent subnets from the GNE. There are no static routes or external OSPF on any elements. ??CTCworkstation and GNE have Router as its default gateway. Can the CTC workstation see the entire SDHnetwork?A. Yes, but only if the CTCs network address is a static route in the GNE.B. Yes, because the GNE will only serve as a proxy-ARP for elements on the same subnet.C. Yes, but only if the routers address is entered as a static route in the non-GNE elements.D. Yes, because the GNE will serve as a proxy-ARP for all elements, regardless of their subnets.Answer: A6. What protocol enables Ethernet over SONET/SDH encapsulation interoperability between the G-seriesand ML-series Ethernet cards?A. LEX www.CertifyMe.com

B. HDLCC. GFP-FD. PPP/BCPAnswer: A7. What is the correct relative switching priority in an MS-SPRing ring (higher to lower)?A. signal fail, signal degrade, manual switchB. signal degrade, signal fail, manual switchC. protection lockout, manual switch, path AISD. forced switch, manual switch, signal degradeE. protection lockout, manual switch, forced switchAnswer: A8. A customer has 2 E1s to add between far-end nodes in an SNCP ring. What type of circuit should yourecommend?A. LO-PATH circuitsB. HO-PATH circuitsC. 1:1 protection circuitsD. 1:N protection circuitsE. LO-TUNNEL tunnel circuitsAnswer: A9. Click the Exhibit button. As shown in the exhibit, a customer has several interconnected core rings. Theywant to create several irtual rings?utilizing their STM-64 backbone (nodes 1, 2, 3, and 4). What do yourecommend? www.CertifyMe.com

A. SNCP ringsB. MS-SPRing ringsC. 1:N protection on all core circuitsD. dual-ring interconnect with MS-SPRing ringsAnswer: A10. A customer has 20 E1s to add between far-end nodes in an SNCP ring. What type of circuit would yourecommend?A. LO-PATH circuitsB. HO-PATH circuitsC. 1:1 protection circuitsD. 1:N protection circuitsE. LO-PATH tunnel circuitsAnswer: E11. A customer would like to create a 1:1 protection group with a DS3Ni-12 card. Where should it be placedin the chassis?A. only Slots 6 or 12B. only Slots 3 or 15C. high or low speed slots www.CertifyMe.com

D. directly adjacent to the working cardE. high-speed slots only (5/6 and 12/13)Answer: D12. What are two characteristics of dual-ring interconnect in SDH networks? (Choose two.)A. It protects signals against node failures between rings.B. It protects signals against node failure within a single ring.C. It allows for traffic to be preempted when a ring switch occurs.D. Traffic can be dropped and continued at interconnecting nodes.E. It protects preemptible traffic from being dropped when a ring switch occurs.Answer: AD13. You are provisioning an E-1 circuit on an ONS 15454 SNCP configuration and XC-VXL-10G card. Howmany total ports are used within the Low-Order matrix at the source node?A. 0B. 1C. 2D. 3E. 5Answer: E14. Why is an STM-1 2F-MS-SPRing NOT feasible?A. An equal amount of working and protect bandwidth is required.B. DCC bandwidth is not large enough to handle K1/K2 processing.C. Switch times would exceed 50 ms for an STM-1 MS-SPRing ring.D. There is not enough bandwidth in an STM-1 ring to justify MS-SPRing protection.Answer: A15. You are installing a Cisco ONS 15454 SDH in a service provider site. An E3 cable is being connected toa digital cross-connect system. What is the maximum distance allowed between the two? www.CertifyMe.com

A. 225 ftB. 450 ftC. 655 ftD. 900 ftAnswer: B16. The ML-series Ethernet card on the ONS 15454 provides up to _____ active Q-in-Q instances per card.A. 512B. 255C. 1024D. 4096Answer: B17. Which three timing modes are supported on the ONS 15454 shelf? (Choose three.)A. line timingB. loop timingC. internal timingD. through timingE. external timingAnswer: ACE18. Click the Exhibit button. Within an ONS 15454, you are provisioning a circuit on an unprotected SNCPring. In the exhibit, which two must you configure? (Choose two.) www.CertifyMe.com

A. revertiveB. circuit sizeC. circuit typeD. bidirectionalE. protected dropsF. Switch on PDI-PAnswer: BC19. For lasers with tightly controlled wavelengths, approximately how far apart are the centers of adjacentwavelengths when 100 GHz spacing is used in a DWDM system?A. 0.4 nanometersB. 0.6 nanometersC. 0.8 nanometersD. 1.2 nanometersE. 1.6 nanometersAnswer: C20. The dispersion of a non-zero dispersion shifted fiber is 6 ps/nm*km at 1550 nm and 10 ps/nm*km at1610 nm. What is the minimum dispersion compensation required if an L-Band DWDM signal travelsthrough 200 km of fiber and has a dispersion tolerance of 1800 ps/nm? www.CertifyMe.com

A. noneB. -600 ps/nmC. -200 ps/nmD. +200 ps/nmE. +600 ps/nmAnswer: C21. In the OSNR model for EDFA amplifiers, SNR OUT = 1/(1/SNR IN + FhvB/P IN ), what does SNR INrepresent?A. the signal to noise of the current optical amplifierB. the signal to noise of the previous amplifier or sourceC. the signal to noise introduced by the optical multiplexerD. the accumulated noise to signal ratio of the optical channelAnswer: B22. Click the Exhibit button. When designing a DWDM system with multiple amplified spans, a pre-amp isneeded at Site B to _____. (Choose three.)A. offset the OADM loss at site BB. overcome the high multiplexer loss at site AC. amplify signal levels after the high loss through Fiber Span 1D. adjust add channels at site B to be at the same level as the passthrough channelsE. ensure that the per channel power is higher than the minimum needed for the post-amp at Site BAnswer: ACE www.CertifyMe.com

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642 321

by devin12 on May 05, 2011

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642 321 Document Transcript