多项选择题
A.It supports autonegotiation for both ISL and IEEE 802.1Q trunks.
B.It must be disabled on an interface if you do not want the interface to work as a trunk or start negotiation to become a trunk.
C.It is a point-to-multipoint protocol.
D.It is a point-to-point protocol.
E.It is not supported on private VLAN ports or tunneling ports.
单项选择题 WhichofthesecorrectlyidentifiesadifferencebetweenthewayBPDUsarehandledby802.1wand802.1D？（）
问答题 R1，R2，R3 are all in same ospf area， there is a virtual link between R1 and R3. Pls answer： Are the hello packets exchanged between the virtual link？
多项选择题 UnderwhichtwocircumstanceswouldanRSTPbridgeflushitsCAMtable？（）