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問答題 R1（AS1）------R2（AS2）-----R3（AS2）----R4（AS2），R1在AS1，R2，R3，R4在AS2，R1和R2建EBGP ， R2和R3 IBGP，R3和R4 IBGP，產(chǎn)生BGP路由從R1傳給R2，問這條路有會不會在R4上出現(xiàn)，如果不會，怎么解決.

參考答案： No， R4 will not have the route...

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1.單項選擇題 Refer to the exhibit. Voice traffic is marked "precedence 5." How much bandwidth is allocated for voice traffic during periods of congestion？（）

A.a minimum of 48 kb/s
B.a maximum of 48 kb/s
C.a minimum of 48% of the available bandwidth
D.a maximum of 48% of the available bandwidth

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2.問答題 As 2 產(chǎn)生A的BGP路由，R1上分別設(shè)置了weight， local-precedence如圖所示：問R1要到A，把數(shù)據(jù)包給誰？

參考答案：選R3那條路，weight優(yōu)先于local-preference.
The path to...

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3.多項選擇題In Layer 2 topologies， spanning-tree failures can cause loops in the network. These unblocked loops can cause network failures because of excessive traffic. Which two Catalyst 6500 features can be used to limit excessive traffic during spanning-tree loop conditions？（）

A.loop guard
B.storm control
C.storm suppression
D.broadcast suppression
E.BPDU guard

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4.單項選擇題 Refer to the exhibit. In the diagram, the switches are running IEEE 802.1w RSPT. On which ports should root guard be enabled in order to facilitate deterministic root bridge election under normal and failure scenarios? （）

A.GE-3/1，GE-3/2
B.FE-2/1，F(xiàn)E-3/2
C.GE-1/1，GE-1/2
D.GE-4/1，GE-4/2
E.GE-2/1，GE-2/2
F.GE-3/1，GE-3/2，GE-4/1，GE-4/2，F(xiàn)E-2/1，F(xiàn)E-3/2

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5.單項選擇題 Refer to the exhibit. In the diagram, the switches are running IEEE 802.1s MST. Which ports are in the MST blocking state?（）

A.GE-1/2 and GE 2/1
B.GE-1/1 and GE-2/2
C.GE-3/2 and GE 4/1
D.no ports are in the blocking state
E.There is not enough information to determine which ports are in the blocking state

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