A.Both use LDP
B.Both use BGP
C.Both require additional hardware.
D.Both use a two-label stack for forwarding.

A.L2TP
B.2547bis
C.L2F
D.PPTP
E.MPLS

A.The default OSPF domain-id is 127.0.0.1.
B.It most cases， a domain-id must be configured.
C.It most cases， you do not need to configure a domain-id.
D.For a layer 3 VPN connecting multiple OSPF domains， configuring a domain-id can help control LSA translations.

A.The BGP next hop must be in inet.1.
B.The BGP next hop must be in inet.3.
C.Must have a bidirectional LSP configured.
D.Must have a static route to allow an RP for connected interfaces.

A.Takes the metric of the outgoing interface.
B.Uses the metric that is assigned during configuration.
C.Uses the path metric to reach the virtual neighbor.
D.Uses a default of zero unless otherwise specified.

A.Create virtual links.
B.Advertise external prefixed.
C.Summarize routes between areas.
D.Advertise a router’s interfaces and metrics.

A.DES
B.MD5
C.Kerberos
D.Unauthenticated
E.Simple password

A.There are two equal cost paths between A and B
B.The GE link is the preferred path between A and B
C.The OC12c link is the preferred path between A and B
D.Manual metric assignment must be configured to determine the outcome.

A.set protocols ospf area-range network/mask-length
B.set protocols ospf area area-id nssa area-range network/mask-length
C.set protocols ospf area area-id area-range network/mask-length restrict
D.set protocols ospf area area-id nssa area-range network/mask-length restrict

A.Forwards them to Router B
B.Forwards them to Router C
C.Detects a routing loop and discards them.
D.Forwards them to Router B and Router C alternately.