CCNP系列認證CCNP(642-311)單項選擇題每日一練(2019.01.25)

來源：考試資料網(wǎng)

1 Scrambling of SONET signals is done to （）.

2 Which device creates an OEO conversion?（）

3 For lasers with tightly controlled wavelengths, approximately how far apart are the centers of adjacent wavelengths when 100 GHz spacing is used in a DWDM system?（）

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4 You are installing a Cisco ONS 15454 in a service provider site. A DS3 cable is to be connected to a digital cross-connect system. What is the maximum distance allowed between the two?（）

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5 What protection method is used in 4F BLSR networks?（）

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