单项选择题
A.It enables provider edge （PE） specific checks on a router when the OSPF process is associated with the VRF
B.It disables provider edge （PE） specific checks on a router when the OSPF process is associated with the VRF
C.It enables the exchange of the "VRF-Lite" capability when the OSPF adjacency is formed.
D.It disables the MPLS processing on the OSPF learned routes inside the VRF
单项选择题 WhichstatementbestdescribesOSPFexternalLSAs（type5）？（）
单项选择题 Whichstatementistrueofasourcethatwantstotransmitmulticasttraffictogroup239.1.1.1？（）
单项选择题 WhenaBGProuterisnotcapableofunderstanding4-byteASnumbers，itwillsee4-byteASnumbersasaspecial，reserved，2-byteASnumberintheASpath.Which2-byteASnumberisthisreservedone？（）