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.


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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

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

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

6.多項選擇題What two features in Cisco switches help prevent Layer 2 loops?()

A.UniDirectional Link Detection
B.Hot Standby Router Protocol
C.Virtual Router Redundancy Protocol
D.PortFast
E.root guard
F.loop guard

8.單項選擇題Spanning Tree Protocol calculates path cost based on which of these?()

A.interface bandwidth
B.interface delay
C.interface bandwidth and delay
D.hop count
E.bridge priority

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Which of the following describes the roles of devices in a WAN?()

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Refer to the exhibit.How many broadcast domains exist in theexhibited topology?()

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兩ebgp鄰居發(fā)路由過來 ,哪些屬性重置?

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The following configuration line was added to router R1 Access-list 101 permit ip 10.25.30.00.0.0.255 any What is the effect of this access list configuration?()

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four switches, which one will be root switch.(no pic).

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As a CCNA candidate,you must have a firm understanding of the IPv6 address structure.Refer to IPv6 address,could you tell me how many bits are included in each filed?()

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