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Jn0 643 real exam questions with answers

Exam code: JN0-643

Juniper Networks Certified

Professional Enterprise Routing and Switching


Jn0 643 real exam questions with answers

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Jn0 643 real exam questions with answers

QUESTION 1

QUESTION 1

Which connection method do OSPF routers use to communicate with each other?

A.

A. IP protocol number 89

B.

B. TCP port 179

C.

C. UDP port 179

D.

D. IP protocol number 6

Answer: A

Answer: A

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Jn0 643 real exam questions with answers

QUESTION 2

QUESTION 2

Which statement is true about default BGP route redistribution behavior?

A.

A. IBGP-learned routes are advertised only to other IBGP peers.

B.

B. EBGP-learned routes are redistributed into any IGPs.

C.

C. EBGP-learned routes are advertised only to other EBGP peers.

D.

D. EBGP-learned routes are advertised to other IBGP and EBGP peers.

Answer: D

Answer: D

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Jn0 643 real exam questions with answers

QUESTION 3

QUESTION 3

Which statement is true about LLDP?

A.

A. It allows you to split a broadcast domain into multiple isolated broadcast subdomains.

B.

B. It dynamically manages VLAN registration in a LAN.

C.

C. It maintains a separate spanning-tree instance for each VLAN.

D.

D. It is a Layer 2 protocol that facilitates network and neighbor discovery.

Answer: D

Answer: D

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Jn0 643 real exam questions with answers

QUESTION 4

QUESTION 4

Which statement is true regarding the SPF algorithm?

A.

A. The SPF algorithm is run on a per-domain basis.

B.

B. If you apply an import policy to OSPF, it keeps LSAs from being flooded, and the SPF

calculation can be affected.

C.

C. There are two databases used in the calculation, the link-state database and the tree

database.

D.

D. The SPF calculation is run on a per-area basis on each router.

Answer: D

Answer: D

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Jn0 643 real exam questions with answers

QUESTION 5

QUESTION 5

-- Exhibit

-- Exhibit --

Click the Exhibit button.On AS1, which two attributes are used to influence inbound traffic

from the other ASs shown in the exhibit? (Choose two.)

A.

A. AS path

B.

B. MED

C.

C. local preference

D.

D. origin

Answer: AD

Answer: AD

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Jn0 643 real exam questions with answers

QUESTION 6

QUESTION 6

Which two statements are true about MSDP mesh groups? (Choose two.)

A.

A. The MSDP mesh group was originally designed to limit SA flooding.

B.

B. SA messages received from a mesh group member flood these messages to all peers that

are not members of this mesh group.

C.

C. SA messages received from a peer not in any mesh group do not flood to all peers.

D.

D. SA messages received from a peer not in any mesh group perform a peer-RPF check

and, if successful, flood to all peers (except the advertising router).

Answer: AB

Answer: AB

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Jn0 643 real exam questions with answers

QUESTION 7

QUESTION 7

Which multicast group is used for all PIM routers?

A.

A. 224.0.0.22

B.

B. 224.0.0.13

C.

C. 224.0.0.1

D.

D. 224.0.0.2

Real 48

Juniper JN0-643 Exam

Answer: B

Answer: B

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Jn0 643 real exam questions with answers

QUESTION 8

QUESTION 8

You are asked to implement MSTP on all devices in your Layer 2 network.

Which three parameters must match on all devices within the same region? (Choose three.)

A.

A. region name

B.

B. hello timer

C.

C. maximum age

D.

D. revision level

E.

E. VLAN mapping table

Answer: ADE

Answer: ADE

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Jn0 643 real exam questions with answers

QUESTION 9

QUESTION 9

You are asked to implement VSTP on all devices in your Layer 2 network. Which three

statements are correct? (Choose three.)

A.

A. VSTP supports up to 256 different spanning-tree topologies.

B.

B. A BPDU is sent for each spanning-tree instance.

C.

C. Each VLAN will be assigned to a unique spanning-tree instance.

D.

D. MSTP can be used in addition to VSTP to account for VLANs outside of the supported

range.

E.

E. VSTP can be used to load-balance Layer 2 traffic using VLANs.

Answer: BCE

Answer: BCE

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Jn0 643 real exam questions with answers

QUESTION 10

QUESTION 10

Your company uses 802.1X to authenticate your users. You want to provide access to the

Internet when users cannot authenticate on the RADIUS server or when the RADIUS server

becomes unreachable. Which two methods accomplish this goal? (Choose two.)

A.

A. using a captive portal

B.

B. using a server fail fallback

C.

C. using MAC RADIUS

D.

D. using a guest VLAN

Answer: BD

Answer: BD

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Jn0 643 real exam questions with answers

Juniper Networks Certified Professional Enterprise

Routing and Switching (JNCIP-ENT)

Exam Code: JN0-643

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