单项选择题

A.Clear the MAC address table in the switch.B.Clear the……

You replaced your Layer 3 switch，which is the default gateway of the end users. Many users cannot access anything now，including email，Internet，and other applications，although other users do not have any issues. All of the applications are hosted in an outsourced data center. In order to fix the problem，which one of these actions should you take？（）

A.Clear the MAC address table in the switch.
B.Clear the ARP cache in the switch.
C.Clear the ARP cache in the end devices.
D.Clear the ARP cache in the application servers.

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问答题SRR？

单项选择题Refer to the exhibit. BGP-4 routing to the Internet，in normal behavior，may create asymmetrical routing for different prefixes. The BGP routing table indicates that traffic should follow the paths indicated in the exhibit，but packets are not going further than the border router in AS 4. What could be the cause of this problem？（）

A.TCP Intercept is configured in AS 4.
B.Unicast Reverse Path Forwarding is configured in loose mode in this router.
C.Packets may be leaving AS 1 without the BGP routing flag set to 1.
D.Unicast Reverse Path Forwarding is configured in strict mode in this router.
E.There is a missing Unicast Reverse Path Forwarding configuration.

单项选择题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.

问答题WRR？

单项选择题AnetworkiscomposedofseveralVRFs.ItisrequiredthatVRFusersVRF_AandVRF_BbeabletoroutetoandfromVRF_C，whichhostssharedservices.However，trafficmustnotbeallowedtoflowbetweenVRF_AandVRF_B.Howcanthisbeaccomplished？（）

A.route redistribution
B.import and export using route descriptors
C.import and export using route targets
D.Cisco MPLS Traffic Engineering