Couple of tips for all of you who want to take this exam.

• This exam has quite a lengthy questions not like all the other Google exam. Expect A4 long scenarios at least they were there on the beta.
• The bellow list of the topics is what you need to master:
  • VPCs management
  • Shared VPCs
  • VPC Peering
  • Load Balancers types and use cases
  • VPNs
  • Interconnects (know the configuration process)
  • Cloud Router
  • NAT
  • Firewall rules
  • Cloud DNS
  • Cloud Armor
  • Network for GCE and GKE
• This exam has a lot of topics around routing and multi-pathing.
• General knowledge on networking is very helpful.
• As usual understand IAM for networking

Unfortunatelly there are no good video materials for this exam.

I suggest use the official Coursera materials for the beginning

https://www.coursera.org/learn/networking-gcp-defining-implementing-networks/home/welcome

https://www.coursera.org/learn/networking-gcp-hybrid-connectivity-network-management/home/welcome

and then switch to google Docs. Finish it off with Qwiklabs.

https://google.qwiklabs.com/quests/31?catalog_rank=%7B%22rank%22%3A3%2C%22num_filters%22%3A0%2C%22has_search%22%3Atrue%7D&search_id=4618984

https://google.qwiklabs.com/quests/31?catalog_rank=%7B%22rank%22%3A3%2C%22num_filters%22%3A0%2C%22has_search%22%3Atrue%7D&search_id=4618984

Good luck with the exam!