为自己加油

LSAck报文是对下列哪些OSPF报文的确认?

A.HELLO报文(HelloPacket);
B.DD报文(DatabaseDescriptionPacket);
C.LSR报文(LinkStateRequestPacket);
D.LSU报文(LinkStateUpdatePacket);
E.LSAck报文(LinkStateAcknowledgmenPacket);