單項(xiàng)選擇題Which option describes the incorrect usage of the Label Distribution method？（）

A.LDP is primarily used in internal networks of MPLS-VPN providers.
B.MP-BGP is used for label distribution for VPN customer routes.
C.Directed LDP is used for label distribution in L2-VPN Attachement Circuits.
D.MP-BGP is used for label distribution in MPLS Traffic Engineered networks.


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1.單項(xiàng)選擇題Select the statement that best describes The cure for Amplification Principle in the Internetdomain， as explained in RFC 3429 （Internet Architectural Guidelines ）（）？

A.Amplification is prevented if global changes have only a local effect as opposed to systems in which global changes have a local effect
B.Amplification is prevented if local changes have only a local effect as opposed to system inwhich localchange have a global effect
C.Internet domain does not suffer from“The Amplification Principle”as BGP takes care of misbehaving advertisers
D.None of the above

2.多項(xiàng)選擇題In which of the following BGP-related events is an End-of-RIB （EOR） message sent？（）

A.Following a link flap in the BGP speaker’s AS
B.During initial convergence.
C.Following a Route Processor Switchover.
D.Just before sending a CEASE message to tear down the session.
E.During capability negotiation

3.單項(xiàng)選擇題VoIP bearer traffic is typically marked to which DSCP value？（）

A.cs3
B.cs7
C.ef
D.af41
E.af31
F.0（default）

4.多項(xiàng)選擇題In Multicast VPN （MVPN） implementations， which two of the following statements are regarding the DefaultMDT Group？（）

A.It is used for PIM control traffic
B.It is optionally configured for a high bandwidth multicast source to reduce multicast traffic replication to uninterested PE routers
C.Within the VPF configuration in the PE router， multiple Default MDT groups are configured so each VPF can support multiple multicast sources
D.There is a reduced multicast state in the MPLS core P routers
E.When multicast traffic exceeds a certain configured threshold， traffic from the Data MDT is switched to the Default MDT to conserve bandwidth

5.單項(xiàng)選擇題A network administrator wants to detect a login attack against a router. What IOS command can make the attack recorded in syslog server？（）

A.Logging detect fail-login
B.Login on-failure log
C.Login detect login-failure log
D.Logging login on-failure
E.none of the above

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