单项选择题

What is the correct virtual link configuration on an OSPF router?（）

A.
B.
C.
D.

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多项选择题
Which two signaling protocols could be used in VPLS to advertise site information between PEs? （）

A. IKE
B. BGP
C. RSVP
D. LDP
多项选择题
What are three examples of a provider-provisioned VPN supported by JUNOS software? （）

A. L2F
B. PPTP
C. Circuit cross-connect
D. Draft-Martini-based VPNs
E. Draft-Kompella-based VPNs
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