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單項選擇題Two BGP peers connected through a routed firewall are unable to establish a peering relationship. What could be the most likely cause？（）

A.BGP peers must be Layer 2-adjacent.
B.EBGP multihop is not configured.
C.The firewall is not configured to allow IP protocol 89.
D.The firewall is not configured to allow UDP 179.

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1.單項選擇題A network is composed of several VRFs. It is required that VRF users VRF_A and VRF_B be able to route to and from VRF_C，which hosts shared services. However，traffic must not be allowed to flow between VRF_A and VRF_B. How can this be accomplished？（）

A.route redistribution
B.import and export using route descriptors
C.import and export using route targets
D.Cisco MPLS Traffic Engineering

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2.單項選擇題Which OSPF LSA type does an ASBR use to originate a default route into an area？（）

A.LSA 1
B.LSA 3
C.LSA 4
D.LSA 5
E.LSA 7

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3.多項選擇題Which two of these parameters are used to determine a forwarding equivalence class？（）

A.IP prefix
B.Layer 2 circuit
C.RSVP request from CE for bandwidth reservation
D.BGP MED value

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4.單項選擇題Which one of these statements is true of OSPF type 5 LSAs？（）

A.They are used to summarize area routes to other areas.
B.They are used in not-so-stubby areas to propagate external routes.
C.They are used to notify areas of the ASBR.
D.They are flooded to all areas except stub areas （external route）.

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5.單項選擇題During the IPv6 address resolution， a node sends a neighbor solicitation message in order to discover which of these？（）

A.The Layer 2 multicast address of the destination node
B.The solicited node multicast address of the destination node
C.The Layer 2 address of the destination node based on the destination IPv6 address
D.The IPv6 address of the destination node based on the destination Layer 2 address

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