單項(xiàng)選擇題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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1.問答題SRR？
2.單項(xiàng)選擇題

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.

4.問答題WRR？
8.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.

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