What are three examples of a CPE-provisioned VPN？（）

多项选择题Whichtwostatementsaretruewhenconfiguringadomain-id？（）

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.

单项选择题WhichconditionmustbemettoallowaPEroutertoforwardVPNtrafficacrossaLSPinaLayer3VPNenvironment？（）

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.

单项选择题HowisthecostofavirtuallinkinOSFPcalculated？（）

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.

单项选择题WhatisthefunctionperformedbyLSAType1？（）

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

多项选择题WhichthreeauthenticationoptionsdoesOSPFsupport？（）

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