Here’s one study guide freely available on Juniper website.
https://www.juniper.net/assets/fr/fr/local/pdf/study-guide/study-guide-jncia.pdf
Also, please refer to below link for the recommended list of resource needed to pass JNCIA.
https://www.juniper.net/us/en/training/certification/resources/
HTH
https://www.juniper.net/assets/fr/fr/local/pdf/study-guide/study-guide-jncia.pdf
Also, please refer to below link for the recommended list of resource needed to pass JNCIA.
https://www.juniper.net/us/en/training/certification/resources/
HTH