多项选择题 Refer to the exhibit. From the MAC addresses shown in the command output， to which two ports is the multicast stream 225.230.57.199 being forwarded on this switch？ （）

单项选择题 WhichstatementbestdescribesOSPFexternalLSAs（type5）？（）

单项选择题 ThisquestionisabouttheformationofOSPFadjacency.AnOSPFadjacencywillnotformcorrectlyacrossapoint-to-pointlinkinthesamearea.Whichwouldmostlikelycausethisproblem？（）