Firewalls have become ubiquitous across enterprises over the past decade, but the combination of new and varied access methods combined with increasingly sophisticated attacks has forced network operators and security professionals to constantly evaluate their defenses.
Typically, firewalls are on a five-year refresh cycle, according to Gartner researcher Adam Hils, and that gives organizations the opportunity to evaluate fairly regularly what type of firewall and what features best suit their needs.
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Source: NW Security 1