問答題什么是原子聚合？

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1.單項選擇題Which of these best identifies the types of prefixes a router running BGP will advertise to an EBGP peer？（）

A.prefixes received from any other BGP peer and prefixes locally originated via network statements or redistributed to BGP
B.all prefixes in its IP routing table
C.only prefixes received from EBGP peers and prefixes locally originated via network statements or redistributed
D.only prefixes received from EBGP peers and prefixes received from route reflectors
E.all prefixes in its routing table except the prefixes received from other EBGP peers
F.all prefixes in its routing table except the prefixes received from other IBGP peers

4.多項選擇題Which three of these statements about penultimate hop popping are true？（）

A.It is used only for directly connected subnets or aggregate routes.
B.It can only be used with LDP.
C.It is only used when two or more labels are stacked.
D.It enables the Edge LSR to request a label pop operation from its upstream neighbors.
E.It is requested through TDP using a special label value that is also called the implicit-null value.
F.It is requested through LDP using a special label value that is also called the implicit-null value.