單項選擇題What statement about Transit AS is true？（）

A.Traffic and prefixes originating from Source AS are carried across a Transit AS to reach theirdestination AS
B.Traffic and prefixes originating from Transit AS are carried across a Stub AS to their destination AS
C.Traffic and prefixes originating from Transit AS are carried across a Stub AS to their Source AS
D.None of the above


您可能感興趣的試卷

你可能感興趣的試題

1.單項選擇題The ASBR-summary LSA is：（）.

A.Generated by the ASBR and describes reachability to itself
B.Generated by the ASBR and describes reachabilty to the ABR
C.Generated by the ABR and describes reachabilty to the ASBR for routers in a different area from the ASBR
D.Generated by the ABR and describes reachabilty to the ASBR for routers in the same area with the ASBR

3.單項選擇題What is used to provide read access to QoS configuration and statistics information on Cisco platforms thatsupport Modular QoS CLI （MQC）？（）

A.Cisco NBAR Discovery
B.Cisco AutoQoS
C.Cisco Class-Based QoS MIB
D.Cisco SDM QoS Wizard
E.CDP

4.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

5.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.

6.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

7.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.

8.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

9.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

10.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.