单项选择题

In which Cisco IOS configuration mode is the route distinguisher （RD） configured？（）

A.R1（config-route-at）#
B.R1（config-route-map）#
C.R1（config-it）#
D.R1（config-vrf）#
E.R1（config）#
F.R1（router）#

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多项选择题

Which two statements about MPLS point-to-multipoint traffic engineering （P2MP TE） are true？（）

A.P2MP TE uses an OSPF extension that is different from the OSPF extension that is used in P2P TE
B.Loose path is not supported in P2MP TE
C.Multiple IP multicast groups can map to one P2MP tunnel
D.Affinity is not supported in P2MP TE
E.P2MP TE uses Constrained Shortest Path First （CSPF） to calculate paths

单项选择题

Which statement about ATM AAL5 over MPLS is true？（）

A.It supports ATM signaling.
B.It supports traffic shaping of packets in MPLS to the ATM path.
C.It supports ATM switched virtual circuits
D.It supports fragmentation and reassembly.
E.It supports AAL5 SDU switching

单项选择题

In the Cisco Resilient Ethernet Protocol （REP）， how many ports are always blocking？（）

A.zero
B.at least one
C.at least two
D.at least four
E.at least three