标题: 642-321考題下載 [打印本页] 作者: feifeiaiqi 时间: 2011-02-02 14:33 标题: 642-321考題下載 <p align="left"><p align="left">最新642-321考題分享</p></p><p align="left"><p align="left">1.Which timing mode is most appropriate for an ONS 15454 that has lost its BITS-1 and optical references?</p></p><p align="left"><p align="left">A.line timing</p></p><p align="left"><p align="left">B.loop timing</p></p><p align="left"><p align="left">C.internal timing</p></p><p align="left"><p align="left">D.through timing</p></p><p align="left"><p align="left">E.external timing</p></p><p align="left"><p align="left">Answer: C</p></p><p align="left"><p align="left">2.With R4.0, how many total DCC-R tunnel connections can each ONS 15454 support using the TCC+ card?</p></p><p align="left"><p align="left">A.10</p></p><p align="left"><p align="left">B.32</p></p><p align="left"><p align="left">C.64</p></p><p align="left"><p align="left">D.84</p></p><p align="left"><p align="left">E.96</p></p><p align="left"><p align="left">Answer: B</p></p><p align="left"><p align="left">3.What is the difference between 1+1 and 1:1 protection switching?</p></p><p align="left"><p align="left">A.1+1 is based on APS, while 1:1 is based on IPS.</p></p><p align="left"><p align="left">B.1:1 is used in SNCP switching, while 1+1 is used in MS-SPRing switching.</p></p><p align="left"><p align="left">C.1+1 sends signals on Working and Protect paths, while 1:1 sends signals only on Working path.</p></p><p align="left"><p align="left">D.1+1 sends signals on Working path ONLY, while 1:1 sends signals on both Working and Protect paths.</p></p><p align="left"><p align="left">Answer: C</p></p>作者: phisher 时间: 2011-02-05 22:12
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