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They dont compare. The ASA5505 can push ~150Mbps of throughput while the 871 will push around 10-20Mbps depending on what features you have configured. Vito called it correct with different OS's, while the ASA does run an "IOS shell" its NOT IOS(finessOS) and things are done differently. You need to weight to benefits to the cost, the 871 is a fraction of the price the 5505 will be w/ full security licenses.Mainly how do they compare to a ASA5505? They seem to be a cross between the ASA and a 18xx series router, is this assumption correct?
Inherently more secure, yes, but only due to the default inspection set... with basic stateful inspection on both devices they would yeild identical security benefits. Realize that, the ASA can be implement more security mechanisms but YOU need to configure them. Out of the box its only slightly more secure than a routing device.An ASA is inherently more secure than a router even if it was running the firewall feature set.