[多选] Which two of these are characteristics of multicast routing？（）

A . multicast routing uses RPF
B . multicast routing is connectionless.
C . In multicast routing， the source of a packet is known.
D . When network topologies change， multicast distribution trees are not rebuilt， but use the originalpath
E . Multicast routing is much like unicast routing， with the only difference being that it has a a groupof receivers rather than just one destinatio

Which three of these are major scaling, sizing, and performance considerations for an IPsec design?（） connection speed。 number of remote sites。 features to be supported。 types of devices at the remote site。 whether packets are encrypted using 3DES or AES。 number of routes in the routing table at the remote site。社会工作含义？固定资产原价扣除折旧后为账面价值（净额）。对债务人来说，以固定资产清偿债务时，应确定固定资产公允价值，重组债务的账面价值超过固定资产的公允价值的部分作为债务重组损失。试述手动准同期并列操作程序 Which two of these are characteristics of multicast routing？（）

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[多选] Which two of these are characteristics of multicast routing？ （）

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[多选] Which two of these are characteristics of multicast routing？（）