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單項選擇題 Refer to the exhibit. Look at the command output. What would be the most probable reason for this port-ID mismatch？（）

A. spanning-tree misconfiguration
B. speed mismatch configuration
C. cabling problem
D. configuration problem

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1.單項選擇題Which type of domains is interconnected using Multicast Source Discovery Protocol？（）

A.PIM-SM
B.PIM-DM
C.PIM-SSM
D.DVMRP

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2.多項選擇題An 802.1Q trunk is not coming up between two switches. The ports on both switches areconfigured as "switchport mode desirable." Assuming that there is no physical issue， choose two possible causes.（）

A. Incorrect VTP domain
B. Incorrect VTP password
C. Incorrect VTP mode
D. Incorrect VTP configuration revision

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3.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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4.多項選擇題Which three fields are optional in an OSPFv3 external LSA？（）

A.Forwarding Address
B.External Route
C.Reference Link-State ID
D.Option
E.Prefix Options

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5.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

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