单项选择题

In a frame ，the MPLS label is imposed（）.

A.After the Layer3 header and before Layer2 header
B.After the Layer2 header and before Layer3 header
C.Within the Layer 3 header
D.Before the layer 2 header

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多项选择题

Which IOS features are used to avoid Routing loops when dynamic Routing protocols are used betweenPE and CE in MPLS-VPN networks？（）

A.Site Of Origin SOO.
B.SHAM links with OSPF
C.BGP cost community
D.BGP feature allow-as in
E.RPF Reverse Path forwarding.
F.Access-list Control in Distance Vector protocol like RIP and EIGRP.

单项选择题

BCP （Best Common Practices） 38/RFC 2827 Ingress and Egress Packet Filtering would help mitigate whatclassification of attack？（）

A.Sniffing attack
B.Denial of service attack
C.Port Scan attack
D.Reconnaisance attack
E.Spoofing attack

单项选择题

Based on the following output in R1， which statement is true？（）

A.If a labeled packet arrives with the top most label of 17， it will be replaced with label 19 and sent out on Ethernet 0/0 interface.
B.If a labeled packet arrives with the top most label of 19， it will be replaced with label 17 and sent out on Ethernet 0/0 interface.
C.If a labeled packet arrives with the top most label of 17， all the labels will be removed and a clear IP Packet is sent to Next Hop 192.168.0.14 on Ethernet 0/0.
D.None of the above.