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.


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1.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

2.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

3.多項選擇題Which two options best describe the purpose of session ID and cookie field in a L2TPv3 packet？（）

A.The session ID is a 32-bit locally significant field used to identify the call on the destination or egresstunnel endport. The session ID will be negotiated by the control connection or statically defined if usingthe L2TP v3 data plane only
B.The cookie is a variable length（with a maximum of eight bytes），word-aligned optional field. The controlconnection can negotiate this as an additional level of guarantee beyond the regular session ID lookupto make sure that a data message has been directed to the correct session or that any recently reusedsession ID will not be misdirected
C.The cookie is a 32-bit locally significant field used to identify the call on the destination or egress tunnelendpoint. The cookie will be negotiated by the control connection or statically defined if using theL2TPv3 data plane only
D.The session ID is a variable length（with a maximum of eight bytes），word-aligned optional field the control connection can negotiate this as an additional level of guarantee beyond the regular cookielookup to make sure that a data message has been directed to the correct session or that any recentlyreused cookie will not be misdirected.

4.多項選擇題Select 3 AVPs （Attribute-Value Pair） which MUST be present in the ICRQ：（）

A.Message Type
B.Calling Number
C.Assigned Session ID
D.Called Number
E.Call Serial Number

5.多項選擇題What ISIS TLVs are used to support MPLS-traffic Engineering？（）

A.Extended IS neighbor TLV # 22
B.Extended IS name TLV #137
C.Extended IS resource TLV #138
D.Extended IS reachability TLV #135
E.Router ID TLV # 134