多項選擇題Which two features prevent routing loops between the OSPF sites of a customer when the sites aremultihomed or a backdoor link is used between the sites？ （）

A.sham link
B.down bit
C.virtual link
D.Site of Origin
E.domain tag


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1.單項選擇題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）#

2.多項選擇題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

3.單項選擇題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

4.單項選擇題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

5.多項選擇題Which two statements about OSPF IPv6 routing are true？（）

A.It requires OSPF version 3.
B.automatically detects neighbors over NHMA interfaces
C.It supports encryption using
D.It uses LSA type 9
E.It uses LSA type 8