Why Ciena's stock is down on Monday

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Ciena Corp.’s stock price is down more than 4 percent in trading Monday after an analyst expressed caution about the computer networking company’s upcoming quarterly earnings reports. Alex Henderson, a senior analyst at New York investment firm Needham & Co., said in a note he expects Hanover-based Ciena to meet its fourth-quarter earnings expectations, but at the lower end of estimates. He also expects Ciena to lower its guidance for its current first quarter because of increased merger and acquisition…