JN0-643 questions and answers

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Exam Code: JN0-643
Exam Name: Juniper (Enterprise Routing and Switching, Professional (JNCIP-ENT))
Free One year updates to match real exam scenarios, 100% pass and refund Warranty.
Total Q&A: 201 Questions and Answers
Last Update: 2014-04-02

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NO.1 You must configure your access switch with more than 3000 VLANs and you want the ability
to load-balance across them.
Which spanning-tree approach has the least impact on control-plane performance?
A. Configure your access switch with a load-balancing policy and apply it under [edit protocols rstp].
B. Configure your access switch for Rapid-PVST+.
C. Configure your access switch for MSTP , incorporating the use of MSTIs.
D. Configure your access switch for both VSTP and RSTP .
Answer: C

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NO.2 A company is deploying a new 802.1X port-based security infrastructure to allow users to
access resources through wired Ethernet ports. However they recently deployed an RSA
token-based system for users to connect remotely. The network administrator wants to reuse the
same security database for 802.1X port-based security.
Which 802.1X authentication protocol is required?
A. EAP-TLS
B. LAN-PEAP
C. RSA-EAP
D. EAP-TTLS
Answer: D

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NO.3 Port authentication falls back to Captive Portal.
In which two scenarios would the port authentication move back to 802.1X? (Choose two.)
A. if any MAC RADIUS request packet is received on the interface and if there are no sessions in
authenticated/authenticating state
B. if Captive Portal is deactivated on the interface
C. if the user gets logged out
D. if the EAP packet is received on the interface and if there are no sessions in
authenticated/authenticating state
Answer: B,D

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NO.4 You have implemented 802.1X authentication in your Layer 2 network and you have only a
single RADIUS server. You are asked to ensure that if the RADIUS server becomes unreachable or
fails, users connected to the ge-0/ 0/ 0 port are still able to reach the Internet using a predefined
guest VLAN.
Which command allows this access?
A. [edit]
user@switch# set protocols dot1x authenticator interface ge-0/ 0/ 0.0 radius-fail vlan guest
B. [edit]
user@switch# set protocols dot1x authenticator interface ge-0/ 0/ 0.0 server-fail vlan-name guest
C. [edit]
user@switch# set protocols dot1x authenticator interface ge-0/ 0/ 0.0 auth-fail assign-vlan guest
D. [edit]
user@switch# set protocols dot1x authenticator interface ge-0/ 0/ 0.0 radius-fail assign guest
Answer: B

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NO.5 During the BGP route-resolution process, the Junos OS must calculate the appropriate
next-hop based on the BGP protocol next-hop attribute.
Which two routing tables are checked during this process in a default Junos configuration? (Choose
two.)
A. inet.0
B. inet.1
C. inet.2
D. inet.3
Answer: A,D

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NO.6 You are AS 6573.
Which AS path regular expression matches only routes originated in your AS?
A. "6573.*"
B. ".*"
C. "{"
D. "