ArequestarrivedonyourMPLS-vpn-bgpgroup.Duetoasecuritybreach，yourcustomerisexperiencingDoSattackscomingfromspecificsubnets（200.0.10.0/24，200.0.12.0/24）.YouhavecheckedallMPLS-EBGProutesbeingadvertisedtoBHKfromotherVPNsitesandfoundfoursubnetslisted：200.0.10.0/24，200.0.11.0/24，200.0.12.0/24，200.0.13.0/24.YouimmediatelyapplyanoutboundACLfilterusingtheappropriateMPLS-EBGPtool：access-list1deny0.0.0.0255.255.254.255access-list1permitanyWhathappenswhenyouapplythisACLontheMPLS-EBGPconnectiontoBHK？（）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.

单项选择题

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.

CCIE系列认证综合练习