单项选择题

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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多项选择题

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

多项选择题

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

单项选择题

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