I'm installing 2 ASA 5510s, one as the primary and one as the failover. If I use a Netgear 10/100 Fast Ethernet 5 port switch in between the firewalls and the ISP's, will I be creating a bottleneck?
If your ports are all running at 100 Mbps (and your ISP connection is less than that) you shouldn't have any problem.
If you're running a port at 10 Mbps and your ISP speed is more than that - then, yes, your switch will limit your throughput.
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