题目内容
（请给出正确答案）
[主观题]
While troubleshooting an EIGRP routing problem you notice that one of the routers have generated a large number of SIA messages.What are two possible causes for EIGRP Stuck - In -Active routes？（）
A. Some quer y or reply packets are lost between the routers.
B. The neighboring router starts receiving route updates from this router.
C. A failure causes traffic on a link between two neighboring routers to flow in only one direction(unidirectional link).
D. Th e neighboring router stops receiving ACK packets from this router.
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