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Exam Code: JN0-643
Exam Name: Juniper (Enterprise Routing and Switching, Professional (JNCIP-ENT))
One year free update, No help, Full refund!
Total Q&A: 201 Questions and Answers
Last Update: 2014-02-22

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NO.1 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.2 Which three attributes must a BGP update contain? (Choose three.)
A. next-hop
B. MED
C. origin
D. AS-path
E. local preference
Answer: A,C,D

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NO.3 Which protocol reachability is advertised by OSPFv2?
A. IPv4
B. IPv5
C. IPv6
D. ISO
Answer: A

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NO.4 You have been asked to implement a private VLAN with two community VLANs.
This private VLAN will be confined to a single switch in your Layer 2 network.
This private VLAN, along with other VLANs configured on the switch, will require gateway services
provided through a connected router.
Which statement about this deployment is true?
A. All isolated ports must be configured as trunk ports.
B. A minimum of one promiscuous trunk port is required.
C. Both community VLANs must have an assigned VLAN IDs.
D. A minimum of one private VLAN trunk port is required.
Answer: B

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NO.5 A network routes IPv4 traffic only. You want to add IPv6 to the network, but you must use a
single IGP for both IPv4 and IPv6 traffic.
Which protocol meets this requirement?
A. OSPFv2
B. BGPv4
C. ES-ISv1
D. OSPFv3
Answer: D

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NO.6 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.7 You are implementing MSTP in your network.
Which three values must match on all switches within the MST region? (Choose three)
A. Context identifier
B. Region name
C. VLANs
D. Revision
E. Configuration manifest
Answer: B,C,D

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NO.8 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.9 Which option is a valid IPv6 multicast address?
A. fe80::205:8640:471:3200/ 64
B. ::172.16.0.5 /126
C. ff03:365:ba::23
D. ff01:cgfc:345:22::226:8ff:fee4:bf6f
Answer: C

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NO.10 Voice traffic is coming in on UDP port 17689. This traffic must be classified into the
expedited-forwarding forwarding class.
Which type of classifier is needed?
A. code point alias
B. rewrite marker
C. multifield
D. behavior aggregate
Answer: C

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NO.11 A Layer 2 forwarding loop occurred on your network during a scheduled maintenance period.
You must prevent this behavior in the future.
Which protocol should you enable on the EX Series switch to address this condition in the future?
A. DVMRP
B. L2TPv3
C. STP
D. RSVP
Answer: C

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NO.12 A user complains about connectivity problems from their IP address (10.1.1.87) to a server
(10.65.1.100).
Which Junos command can help verify connectivity in the network?
A. mroute
B. traceoptions
C. ping
D. clear bgp neighbor
Answer: C

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NO.13 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.14 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.15 You are AS 6573.
Which AS path regular expression matches only routes originated in your AS?
A. "6573.*"
B. ".*"
C. "{"
D. "