單項選擇題Which statement about OSPF authentication is true？（）

A.To enable OSPF authentication in a network， OSPF area 0 authentications must be enabled first
B.The payload of OSPF version 3 packets contains no authentication information
C.OSPF version 3 supports Advanced Encryption Standard
D.OSPF version 3 uses router ID as a key to encrypt OSPF hello packets
E.OSPF MD5 authentication uses TCP， and Plan Test authentication uses UDP


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1.多項選擇題Which three statements about bidirectional PIM are true？（）

A.Traffic for a bidirectional group flows along the one shared tree and simultaneously utilizes multiple paths in a redundant network topology
B.It does not require any traffic signaling in the protocol
C.Membership to a bidirectional group is signaled using explicit Join messages
D.It maintains source-specific forwarding state
E.It reduces memory， bandwidth， and CPU requirements

2.多項選擇題Which four services use the inner labels of an MPLS label stack？ （）

A.MPLS VPN
B.switching path in MPLS core
C.Cisco MPLS Traffic Engineering and Fast Reroute
D.MPLS over ATM
E.VPN over Traffic Engineering core
F.any transport over MPLS

3.單項選擇題What is the default maximum transmission unit on the Cisco router ATM interface？（）

A.4470 bytes
B.1516 bytes
C.9288 bytes
D.1500 bytes
E.1492 bytes

4.單項選擇題What are the Address Family Identifier （AFI） and Subsequent Address Family Identifier （SAFI） values forVPNv6？（）

A.AFI is 2， SAFI is 96
B.AFI is 1， SAFI is 98
C.AFI is 1， SAFI is 64
D.AFI is 1， SAFI is 128
E.AFI is 2， SAFI is 128
F.AFI is 2， SAFI is 64

5.單項選擇題Which statement about L2VPN Pseudowire Switching is not true？（）

A.L2VPN Pseudowire Switching allows the user to extend L2VPN Pseudowires across an inter-AS boundary
B.L2VPN Pseudowire Switching allows the user to extend L2VPN Pseudowires across two separate MPLS networks
C.Quality of service is not supported per Pseudowire
D.L2VPN Pseudowire Switching connects two or more contiguous Pseudowires segments to from an end-to-end multihop Pseudowire
E.The Cisco MPLS Traffic Engineering tunnel selection is not supported