Juniper Juniper Certifications JN0-643 Questions & Answers

• Question 151:

  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

  Correct Answer: AD

• Question 152:

  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.

  Correct Answer: B

• Question 153:

  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

  Correct Answer: BCD

• Question 154:

  Which three attributes must a BGP update contain? (Choose three.)

  A. next-hop

  B. MED

  C. origin

  D. AS-path

  E. local preference

  Correct Answer: ACD

• Question 155:

  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.

  Correct Answer: C

• Question 156:

  Which AS path regular expression matches only routes originated in your AS?

  A. "6573.*"

  B. ".*"

  C. "{"

  D. "^$"

  Correct Answer: D

• Question 157:

  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

  Correct Answer: C

• Question 158:

  Which protocol reachability is advertised by OSPFv2?

  A. IPv4

  B. IPv5

  C. IPv6

  D. ISO

  Correct Answer: A

• Question 159:

  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

  Correct Answer: D

• Question 160:

  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::226:8ff:fee4:bf6f

  Correct Answer: C