單項選擇題In which integration method is an IPV6 packet encapsulated within an IPV4 protocol?（）

A. proxy.
B. dual-stack
C. tunneling
D. dot1q


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1.單項選擇題The enable secret command is used to secure access to which CLI mode?（）

A. user EXEC mode
B. global configuration mode
C. privileged EXEC mode
D. auxiliary setup mode

2.單項選擇題Which statement about vlan operation on cisco catalyst switches is true?（）

 A. when a packet is received from an 802.1Q trunk,the vlan id can be determined from the source MAC address table.
B. unkown unicast frames are retransmitted only to the ports that belong to the same vlan
C. ports between switches should be configured in access mode so that vlans can span across the ports
D. broadcast and multicast frames are retransmitted to ports that are configured on different vlan.

3.單項選擇題A router receives information about network 192.168.10.0/24 from multiple sources.What will the router consider the most reliable information about the path to that network?（）

A. an OSPF update for network 192.168.0.0/16
B. a static router to network 192.168.10.0/24
C. a static router to network 192.168.10.0/24 with a local serial interface configured as the next hop
D. a RIP update for network 192.168.10.0/24
E. a directly connected interface with an address of 192.168.10.254/24
F. a default route with a next hop address of 192.168.10.1

5.單項選擇題Given an IP address 172.16.28.252 with a subnet mask of 255.255.240.0, what is the correct network addres?（）

A. 172.16.16.0
B. 172.16.24.0
C. 172.16.0.0
D. 172.16.28.0

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Which address is the IPV6 all-RIP-routers muticast group address that is used by RIPng as the destaion address?（）

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Which protocol reduces administrative overhead in a switched network by allowing the configuration of a new VLAN to be distributed to all the switches in a domain?（）

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When you are troubleshooting an ACL issue on a router,which command can help you to verify which interfaces are affected by the ACL?（）

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What is the default administrative distance of OSPF?（）

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Which encapsulation type is a Frame Relay encapsulation type that is supported by Cisco routers?（）

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A network administrator needs to configure a serial link between the main office and a remote location.The router at the remote office is a non-cisco router. How should the network administrator configure the serial interface of the main office router to make the connection?（）

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