| Fault Tolerant | A fault tolerant product like the Titanium Mirror TM1000 can still perform its intended functions even if a failure has occurred.
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| Firewall | A firewall is a networking device that selectively decides which network packets are allowed to pass through it and which are not. Contemporary firewalls are stateful, in that they understand several networking layers and can associate related network packets. Connection-based firewalls are bidirectionally stateful and can operate if necessary on all seven layers of the network protocol stack.
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| Fractional T-1 | See T-1. A fractional T-1 is a T-1 that is configured to deliver a bandwidth less than its full rating of 1.544Mbps. Common fractions are 1/4T (384Kbps) and 1/2T (768Kbps), however most equipment can support a fraction at any multiple of 64Kbps.
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| Frame Relay | A type of Wide Area Network, Frame Relay interconnections are available through various interconnects, such as X-25, leased line, and T-1. Frame relay is a predominant legacy method for interconnecting Local Area Networks which is being supplanted in many applications by VPN over Internet connections.
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