單項選擇題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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2.多項選擇題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.

3.單項選擇題

Refer to the exhibit. When applying this policy map on the tunnel1 interface，you see packet loss for the TCP class starting at around 100000 b/s，instead of the configured 150000 b/s. What is the most likely？（）

A.The violate-action command should not be configured.
B.The current configuration of the load-interval command on the tunnel interface is preventing proper policing calculations.
C.The burst size is too low.
D.Policing on tunnel interfaces is not supported.
E.The CIR keyword is missing in the policer.

4.單項選擇題You have done a partial migration from 802.1D STP to 802.1w STP. Which of the following is true？（）

A.802.1D and 802.1w interoperate only when the 802.1D STP domain supports rapid convergence.
B.Ports leading to 802.1D devices will run in compatibility mode， while the rest of the ports will run in 802.1w mode.
C.This is an invalid configuration and a partial migration cannot be done.
D.The bridge timers will be set to match the 802.1D devices.
E.A secondary root bridge will always be populated within the 802.1D domain.
F.If the root bridge is selected within the 802.1D domain， the whole STP domain will run in 802.1D compatibility mode.
G.In partially migrated 802.1w networks， it is recommended to keep the STP diameter below 4.