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February 15, 2017

Update 4A0-102 study guide Guide

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2017 Feb 4A0-102 actual exam

Q1. An Alcatel-Lucent 7750 SR has the BGP configuration shown below. Assuming the router hasestablished BGP sessions to routers R1 and R2, which of the following is TRUE? 

A. Both neighbors R1and R2 should be part of AS 65540. 

B. Neighbor R1should be part of AS 65550, while neighbor R2 should be part of AS 65540. 

C. Neighbor R1should be part of AS 65550, while neighbor R2 should be part of AS 65560. 

D. Both neighbors R1and R2 should be part of AS 65560. 

Answer:


Q2. Click on the exhibit. 

AS 65540 is using MPLS to provide BGP shortcuts for its iBGP routing. AS 65541 is advertisingprefix 192.168.1.0/27 into BGP. Which routers have the BGP update for the advertised prefix intheir BGP table? 

A. Routers R1, R2, R3, R4 and R5. 

B. Routers R1and R4 only. 

C. Routers R1, R2, R3 and R4 only. 

D. Routers R1, R4 and R5 only. 

Answer:


Q3. Which of the following regarding the atomic aggregate attribute is TRUE? 

A. It is an optional transitive attribute. 

B. It is an optional non-transitive attribute. 

C. The atomic aggregate flag is always set if the aggregator attribute is set. 

D. The atomic aggregate flag is always set if the AS Path information is lost due to aggregation. 

Answer:


Q4. Which of the following is TRUE if the state of one BGP neighbor shows Active? 

A. The neighbor will send a Keepalive message. 

B. The router is trying to initiate a TCP connection to that neighbor. 

C. The router received an Open message with the correct parameters. 

D. The router is actively exchanging updates with that neighbor. 

Answer:


Q5. Click the exhibit. 

Routers RR1 and RR2 are route reflectors with the same Cluster-ID. How does router RA treat theupdates for prefix 192.168.1.0/27 received from routers RR1 and RR2? 

A. Router RA prefers the update received from router RR1. 

B. Router RA prefers the update received from router RR2. 

C. Router RA flags both updates as invalid. 

D. Router RA accepts both updates and flags them as used. 

Answer:


Up to the minute 4A0-102 actual test:

Q6. Which of the following behaviors regarding the modification of BGP attributes within aconfederation is TRUE? 

A. Next Hop is modified when crossing member AS boundaries within a confederation. 

B. Origin Code is modified when crossing member AS boundaries within a confederation. 

C. AS Path is modified when crossing member AS boundaries within a confederation. 

D. None of the well known mandatory attributes is modified within a confederation. 

Answer:


Q7. BGP is configured on two peers, routers A and B. Router A is configured with a Hold Time timer of60 seconds and a Keepalive timer of 25 seconds. Router B is configured with a Hold Time timer of90 seconds and a Keepalive timer of 70 seconds. What will the active Keepalive timerbe on routerB? 

A. 70 seconds 

B. 25 seconds 

C. 20 seconds 

D. 30 seconds 

Answer:


Q8. Click the exhibit. 

Router R6 is a route reflector for clients R1, R2 and R5. Router R5 is configured with a localpreference of 200. On which routers is "advertise-external* needed for router R6 to receiveexactlytwo distinct routes for prefix 192.168.1.0/27? 

A. On router R5 only. 

B. On either router R1or R2. 

C. On both routers R1and R2. 

D. On all routers R1, R2 and R5. 

Answer:


Q9. Which of the following is FALSE regarding the 16-bit public autonomous system numbers? 

A. They are allocated to the RIRs by ICANN/IANA. 

B. They are used when connecting ASs on the Internet. 

C. They range from 1 to 56319. 

D. They are assigned by the ISPs for enterprise networks. 

Answer:


Q10. How is the aggregator attribute handled with 32-bit AS numbers? 

A. With the same method and attribute as 16-bit AS numbers. 

B. With the same method as 16-bit AS numbers, but using the AS4_Aggregator attribute. 

C. Aggregation is not yet supported with 32-bit AS numbers. 

D. By using a dummy value of 23456 in the 16-bit AS aggregator field. This value lets the routerknow it needs to read the 32-bit AS number that is contained in the nextTLV. 

Answer:



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