單項(xiàng)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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多項(xiàng)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

多項(xiàng)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

Which statement about OSPF authentication is true？（）

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Which three statements about bidirectional PIM are true？（）

Which four services use the inner labels of an MPLS label stack？ （）

Which three statements about bidirectional PIM are true？（）

Which four services use the inner labels of an MPLS label stack？（）