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The following table lists juniper Firewalls in order of throughput & sessions:
Juniper firewalls shown:
- SSG series
- ISG series
- Netscreen 5200/5400
- SRX series
- J Series
Generally the JunOS SRX Firewalls are far superior to the old ScreenOS SSG/ISG/Netscreen firewall appliances.
The SRX are based on Screenos – although some fetaures have been implemented slightly differenly – ie NAT, Virtual routers, Screening.
The J Series (also JunOS) are now discontinued.
The Official Juniper Matrix is here