CCNP系列認(rèn)證CCNP(642-311)單項選擇題每日一練(2019.01.24)

來源：考試資料網(wǎng)

1 You are provisioning a DS-1 circuit on an ONS 15454 2F-BLSR with a XC-10G card. Each VT1.5 connection must also terminate via the STS matrix. On the originating circuit node, how many STS ports are now available for VT1.5 circuits?（）

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2 On an ONS 15454 node you can tunnel an （）.

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3 A 2.5 Gb/s (OC-48 or STM-16) optical signal with a dispersion tolerance of 1200 ps/nm goes through fiber with 18ps/nm*km of dispersion. How many 15216-DCU-350 equivalents are needed for enough compensation after traveling 100 km?（）

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4 Why are the 1300 nm and 1550 nm regions of the fiber spectrum primarily used for optical communications?（）

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5 UPSR protection switching is initiated by （）, while BLSR is initiated by （）.

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