多項選擇題In which two ways does the BGP graceful capability preserve prefix information during a restart？（）

A.The peer router immediately removes the BGP routers that it learned from the restarting router from itsBGP routing tables.
B.The router establishes BGP sessions with other routers and relearns the BGP routes from others that are also capable of graceful restart. The restarting router waits to receive updates from the neighboringrouters. When the neighboring routers send end-of-RIB messages to indicate that they are donesending updates，the restarting router starts sending its own updates.
C.The peer router sends an end-of-RIB message to the restarting router.
D.The restarting router removes any stale prefixes after the timer for stale entries expires.
E.The restarting router does not remove any stale prefixes after the timer for stale entries expires.


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3.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）#

4.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

5.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