Implementation Planning Flashcards

Which Junos command saves the current configuration to a file for backup?

Answer: save [filename]

In Junos configuration mode, the 'save [filename]' command writes the current candidate configuration to a file in the /var/home/[user]/ directory or a specified path.

What is a change management window in the context of Junos network operations?

Answer: A scheduled period of low traffic during which network changes are performed to minimize user impact

A change management window is an organizational process — a pre-approved time slot (usually nights/weekends) when network changes can be made with minimal risk to business operations.

In Junos, what does 'commit synchronize' accomplish in a dual-RE system?

Answer: Copies the committed configuration from the master RE to the backup RE to ensure both have identical configurations

'commit synchronize' commits the candidate configuration on the master RE and copies the committed configuration to the backup RE, ensuring configuration consistency for failover scenarios.

When planning IP addressing for a Junos network, which RFC defines private IPv4 address ranges?

Answer: RFC 1918 — 10.0.0.0/8, 172.16.0.0/12, and 192.168.0.0/16

RFC 1918 defines three private IPv4 address blocks: 10.0.0.0/8 (Class A), 172.16.0.0/12 (Class B), and 192.168.0.0/16 (Class C), which are not routed on the public Internet.

What is the purpose of a 'pre-check' before implementing Junos configuration changes?

Answer: Collecting baseline state (interface status, BGP summary, OSPF neighbors, route table) to compare against post-change state for rapid issue detection

A pre-check captures the current operational state of the network before changes, enabling direct comparison with post-change state to quickly identify any unintended impacts.

In Junos, how can you schedule a configuration commit for a future time?

Answer: commit at [YYYY-MM-DD HH:MM:SS] or commit at [HH:MM:SS]

The 'commit at' command schedules a configuration commit for a specific future time or absolute date/time, enabling maintenance to occur without operator presence.