F
- firewall
- Protects you from the Internet. Not everyone who uses the Internet has good intentions: Spammers, hackers, pornographers, and even marketers all use the Internet. The cumulative effect of these forces is that you can no longer leave open the metaphorical front door. You must secure your computer and home network from unwanted intrusions. That's the firewall.A firewall lets you configure which types of communications you want to let into your network. You can write an entire book on firewalls and how to configure them. The more restrictive your firewall, the safer you are!
- FLSM
- One approach to subnet masking is fixed-length and subnet masking (FLSM). Fixed-length features equally sized subnets. This approach is infinitely easier to manage over time than a variable-length subnet masking (VLSM) scheme.
- fragmentation
- Fragmentation offset is the mechanism by which a destination machine figures out where the fragment fits relative to the beginning of the piece of data. This is different than the function used by TCP sequence numbers. Sequence numbers are assigned to data segments created by TCP as larger pieces of data (such as files) are segmented for transportation through a network. After segmentation, sometimes network conditions force further fragmentation of data than was done at the source machine. When a segment must be fragmented, the fragmentation offset tracks the sequence of fragments so that the fragments can be properly reassembled into their original segment.
- frame
- The data structure that transports IP packets through a local-area network or other physical network. The frame contains the source and destination addres-ses that are used by the physical network.
- FTP
- The File Transfer Protocol (FTP) is a utility built into TCP/IP that enables you to transfer files between two hosts on an IP network.
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