單項選擇題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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1.多項選擇題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.

2.單項選擇題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

3.單項選擇題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.

4.單項選擇題The Outer.1Q tag represents customer VLAN ID and inner.1Q tag represents Provider VLAN？（）

A.The Outer.1Q tag represents customer VLAN ID and inner.1Q tag represents Provider VLAN （PVLAN ）
B.It is an effective way to achieve VLAN transparency between Provider and enterprise customer bytunneling one ser of VLAN tags inside a second VLAN tag
C.The Outer.1Q tag represents Service VLAN （PVLAN） and inner.1Q tag represents customer VLAN
D.QinQ is a way to hide native VLAN which can conflict with Provider native VLAN

5.單項選擇題As described in rfc 3270，short-pipe mode operstion， the PE to CE egress polices are based upon：（）

A.topmost label exp value
B.customer marking
C.Innerrnost label exp value
D.Qos groups/discard class
E.remarked IP tos value
F.MDRR quantam