Juniper JN0-400 Online Practice Questions and Exam Preparation

Juniper JN0-400 Online Questions & Answers

• Question 101:

  Which statement is correct about Dynamic ARP Inspection (DAI)?

  A. DAI is configured on a per-port basis.
  B. DAI disables the interface when an incorrect ARP packet is received.
  C. DAI is configured on a Layer 3 interface.
  D. DAI requires DHCP snooping to be configured.
  D. DAI requires DHCP snooping to be configured.

• Question 102:

  Which bridging mechanism is used to forward traffic toward an unknown destination?

  A. learning
  B. broadcasting
  C. flooding
  D. forwarding
  C. flooding

• Question 103:

  In EX-series switches, which attacks can the MAC limiting feature help to protect? (Choose two.)

  A. MAC spoofing
  B. ARP poisoning
  C. MAC aging
  D. MAC flooding
  A. MAC spoofing
  D. MAC flooding

• Question 104:

  What are three initial configuration options for EX-series switches? (Choose three.)

  A. Initiate the EZ-setup wizard from the shell prompt by typingezsetup.
  B. Initiate the EZ-setup wizard from operational mode by typingezsetup.
  C. Perform the initial configuration manually with the JUNOS CLI.
  D. Initiate the J-Web EZ-setup Initial Configuration wizard through the LCD menu by choosing factory-defaults setup.
  E. Initiate the J-Web EZ-setup Initial Configuration wizard through the LCD menu by choosing Initial Setup.
  A. Initiate the EZ-setup wizard from the shell prompt by typingezsetup.
  C. Perform the initial configuration manually with the JUNOS CLI.
  E. Initiate the J-Web EZ-setup Initial Configuration wizard through the LCD menu by choosing Initial Setup.

• Question 105:

  Which two fields appear in an 802.1Q tag in an Ethernet header? (Choose two.)

  A. 802.1p priority
  B. VLAN ID
  C. AFI/SAFI
  D. type/length
  A. 802.1p priority
  B. VLAN ID

• Question 106:

  What is the function of the commit confirmed 10 command?

  A. If a second "commit" does not occur within 10 minutes, the system performs a "rollback 1", "commit" sequence.
  B. If a second "commit" does not occur within 10 minutes, the system performs a "rollback 0", "commit" sequence.
  C. This command validates the syntax of a candidate configuration without actually placing it into effect.
  D. If a second "commit" does not occur within 10 minutes, the system performs a "rollback 10", "commit" sequence.
  A. If a second "commit" does not occur within 10 minutes, the system performs a "rollback 1", "commit" sequence.

• Question 107:

  What is the command for setting the active configuration as the rescue configuration?

  A. save rescue configuration
  B. save configuration rescue
  C. request save configuration rescue
  D. request system configuration rescue save
  D. request system configuration rescue save

• Question 108:

  Which statement is correct when adding a new member switch running software version X to a virtual chassis where the current master switch is running software version Y?

  A. Regardless of whether version X is newer than version Y, the new switch joins the virtual chassis running version X while the rest of the members of the virtual chassis run version Y.
  B. If the version X is newer than version Y, the current master switch and existing members of the virtual chassis are automatically upgraded to version X and the new switch joins the virtual chassis.
  C. If the version X is newer than version Y, the new switch becomes the new master while the current master switch and existing members of the virtual chassis are automatically upgraded to version X and become the new backup and line card switches.
  D. Regardless of whether version X is newer than version Y, the new switch joins the virtual chassis operationally only after its software is upgraded or downgraded to match that of the current master switch.
  D. Regardless of whether version X is newer than version Y, the new switch joins the virtual chassis operationally only after its software is upgraded or downgraded to match that of the current master switch.

• Question 109:

  Which three port states are valid for RSTP? (Choose three.)

  A. forwarding
  B. learning
  C. listening
  D. rejecting
  E. discarding
  A. forwarding
  B. learning
  E. discarding

• Question 110:

  You want to configure the JUNOS software to run OSPF on interfaces ge-0/0/1.0 and ge-0/0/2.0 and to place these two interfaces in Area 0.

  Which command(s) will accomplish this task?

  A. set protocolsospf area 0 interfaces [ge-0/0/1.0 ge-0/0/2.0]
  B. set protocolsospf area 0.0.0.0 interface ge-0/0/1.0 set protocols ospf area 0.0.0.0 interface ge-0/0/2.0
  C. set interfaces ge-0/0/1 unit 0 familyinet ospf area 0.0.0.0 set interfaces ge-0/0/2 unit 0 family inet ospf area 0.0.0.0
  D. set protocolsospf interface ge-0/0/1.0 area 0.0.0.0 set protocols ospf interface ge-0/0/2.0 area 0.0.0.0
  B. set protocolsospf area 0.0.0.0 interface ge-0/0/1.0 set protocols ospf area 0.0.0.0 interface ge-0/0/2.0