Can an organization rely on an ISP's firewall to secure its network, or does it need to have its own firewall and DMZ?
If you don't have an in-house firewall administrator, you can rely on your ISP for firewall adminsitration. This can be beneficial to small companies that do not have the in-house expertise to build their own firewall. Most ISPs will offer you managed services such as firewalls, routers, DNS servers and even mail servers to take the burden off a small IT department. I recommend calling around and checking into these services before you select an ISP.
Once your firewall is in place, I recommend bringing in a outside consultant to make sure your ISP secured your network. This is an extra cost, but it's well worth it.
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