OS Overview Flashcards
What OS does JunOS run on?
FreeBSD
What OS does JunOS Evolved run on?
Linux
What is the concept of all JunOS devices having a similar CLI structure, look, and feel?
“One JunOS”
What are Nodes in Junos?
cards, components, etc
How is configuration applied?
via commit
How many versions of JunOS can you store on a legacy JunOS version?
2
How many versions of JunOS can you store on JunOS Evolved?
as many as you have space for
What does DDS stand for?
Distributed Data Store
What is the DDS?
Part of OS Evolved.
Its a central database that the various applications use to store state.
State includes; commited config, interface state, routes, hardware state…
Where is State stored in Legacy JunOS?
Each Daemon has its own state database
What are the two DDS use types?
Subscriber/consumer.
Publisher
Applications like OSPF are publishers.
How frequently is JunOS released?
Quarterly
What is the format of the JunOS version number?
20.x = Major - indicates the year of release
x.2 = Minor = quarter of release
How do bugfix versions get released?
Maintenance release are roughly every 6 weeks. Prefixed with an R (20.2R2 = second maint. release for 20.2). Will fix a bunch of issues.
Service release - ondemand releases aimed at more critical issues… Prefixed with an “S” - 20.2S2
Whats good about JunOS config?
Meaningful and intuitive configuration Hierarchies
ability to annotate the config
checks prior to commit for syntax issues
configuration rollbacks are easy
