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單項選擇題What is a key benefit of using a GRE tunnel to provide connectivity bet ween branch offices and headquarters?（）

A. authentication, integrity checking, and confidentiality
B. less overhead
C. dynamic routing over the tunnel
D. granular QoS support
E. open standard
F. scalability

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1.多項選擇題Which two methods use IPsec to provide secure connectivity from the branch office to the headquarters office?（）

A. DMVPN
B. MPLS VPN
C. Virtual Tunnel Interface (VTI)
D. SSL VPN
E. PPPoE

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2.單項選擇題 Refer to the exhibit. A client has asked you to consult on an eBGP loading question. Currently the AS 100 eBGP links have an average outbound load of 65% and 20% respectively. On further investigation, traffic from 10.10.24.0 accounts for 45%, and 10.10.25.0 and 10.10.32.0 accounts for 20% each of the outbound load. The customer wants to spread the load between the two eBGP links more evenly. The BGP attributes are currently set at their default values. If you are located at AS 100 and want to influence how AS 100 sends traffic to AS 200, what BGP attribute could you configure to cause AS 100 outbound traffic to load the eB GP links more evenly? （）

A. On router A, set the default local - preference to 50.
B. On router B, set the default metric to 150.
C. On router B, configure a route map for 10.10.25.0/24 with a local preference of 150 linked to neighbor 192.168.30.2.
D. On router B, set the default local -preference to 150.

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3.單項選擇題During the IPv6 autoconfiguration, what does the device append to the 64- bit prefix that it receives from the router to create its IPv6 address?（）

A. a pseudora ndom generated number
B. its locally configured IPv4 address
C. the DHCP - supplied device ID
D. its MAC address

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4.單項選擇題 Refer to the exhibit. Based on this command output, what can we conclude about R3?（）

A. R3 is an ABR.
B. R3 is not connec ted to the backbone.
C. R3 has four neighbors.
D. R3 is the DR for area 2.

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5.單項選擇題 Refer to the exhibit. OSPF is running throughout the network. You want to minimize the propagation of LSAs into and out of A rea 1. Which OSPF feature would best achieve this goal? （）

A. stub
B. totally stubby
C. NSSA
D. totally NSSA

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