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Network Configuration Flashcards

6 cards from real JNCIA practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

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  1. What is the default preference value for OSPF routes in Junos?

    Answer: 100

    In Junos OS, OSPF internal routes have a default preference value of 10, while OSPF external routes have a preference of 150.

  2. Which command in Junos operational mode clears OSPF neighbor adjacencies?

    Answer: clear ospf neighbor all

    The 'clear ospf neighbor all' command in Junos operational mode resets all OSPF neighbor adjacencies, forcing OSPF to re-establish neighbors and rebuild the LSDB.

  3. In Junos, how do you configure a static route with a next-hop?

    Answer: set routing-options static route 10.0.0.0/8 next-hop 192.168.1.1

    In Junos, static routes are configured under 'routing-options'. The syntax is 'set routing-options static route [prefix] next-hop [address]'.

  4. What is the function of the Junos 'rescue configuration'?

    Answer: A minimal known-good configuration that can be restored quickly during emergencies

    The rescue configuration is a manually saved minimal configuration that allows operators to recover access to the device quickly if the active configuration becomes problematic.

  5. Which statement correctly describes Junos routing instances?

    Answer: Routing instances create separate virtual routing tables and can be used for VRF-based Layer 3 VPNs

    Routing instances in Junos allow the creation of multiple independent routing tables (virtual routing and forwarding), enabling traffic separation between customers or network segments.

  6. In Junos, what does 'set interfaces ge-0/0/0 unit 0 family inet address 192.168.1.1/24' accomplish?

    Answer: Assigns IPv4 address 192.168.1.1/24 to logical unit 0 of physical interface ge-0/0/0

    This Junos configuration command assigns an IPv4 address to the logical interface unit 0 under the physical Gigabit Ethernet interface ge-0/0/0.

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Sources & references

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  1. learningportal.juniper.net — Test delivery, eligibility, exam format, score release, time limit, exam information · verified Nov 2026
  2. juniper.net — Passing score, score validity, renewal · verified Oct 2026