單項(xiàng)選擇題A request arrived on your MPLS-vpn-bgp group. Due to a security breach， your customer is experiencing DoS attacks coming from specific subnets （200.0.10.0/24， 200.0.12.0/24）. You have checked all MPLS-EBGP routes being advertised to BHK from other VPN sites and found four subnets listed： 200.0.10.0/24， 200.0.11.0/24， 200.0.12.0/24， 200.0.13.0/24. You immediately apply an outbound ACL filter using the appropriate MPLS-EBGP tool： access-list 1 deny 0.0.0.0 255.255.254.255 access-list 1 permit any What happens when you apply this ACL on the MPLS-EBGP connection to BHK？（）

A.It blocks all routes.
B.It blocks the routes 200.0.12.0/24， 200.0.10.0/24 only.
C.It blocks the routes 200.0.12.0/24， 200.0.13.0/24 only.
D.It blocks the routes 200.0.10.0/24， 200.0.13.0/24 only.
E.Nothing happens， no routes are blocked.


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5.多項(xiàng)選擇題The network administrator is trying to add Switch1 to the network， but the 802.1Q trunk is not coming up. Switch1 was previously tested in the laboratory and its trunk configuration worked fine. What are three possible causes of this problem？ （）

A.The trunking configuration mode on Switch1 is set to Off.
B.The trunking configuration mode on the other end is set to On.
C.The trunking configuration mode on the other end is set to Desirable.
D.Cisco Discovery Protocol is not running on the other end.
E.There is a VTP domain name mismatch.
F.Switch1 does not support 802.1Q.