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A firewall is a security system that stands between the local network and the outside world. A firewall screens all inbound and outbound traffic according to a set of rules that you define.
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A virtual private network (VPN) is the extension of a private network that encompasses links across shared or public networks like the Internet. With a VPN, you can send data between two computers across a shared or public network in a manner that emulates a point-to-point private link
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A LAN is a local area network and comprises connected computers within a relatively small area. A WAN or wide area network, extends the data network by using telecommunications to link geographically separate LANs. The Internet is one gigantic WAN.
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Stateful inspection ensures that the firewall remembers what outgoing requests have been sent and then only allow responses to those requests back through the firewall. Other attempts to access the internal network will be denied because they did not initiate from inside the LAN.
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Uplinking means to physical connect the firewall to another hub, router, or switch. There are rules specifying how uplinking should occur, but the auto uplink feature in the FVL328 firewall eliminates the guesswork by detecting the correct connection
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Dynamic Host Configuration Protocol (DHCP) ensures that workstations on the LAN are assigned IP's from the un-routable private range. The service eliminates the need to manually configure IP addresses on each computer and thus eliminates IP conflicts
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Network Address Translation (NAT) hides internally managed IP addresses from external networks by translating multiple private internal addresses to one public external addresses. NAT essentially makes computers on a LAN, non-existent to external computers.
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A static IP address is one that never changes. A dynamic IP address changes at intervals set by your Internet Service Provider (ISP). This concept is important especially when considering VPN. Much like a phone number, if an IP address continually changes, there is no way to make a VPN connection to the LAN without the uses of a DDNS service.
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Trace is a command that traces the path taken by TCP/IP packets from the local computer to a remote computer. The command uses ICMP echo request and reply messages (similar to the ping command) to produce output about each router that is crossed and the roundtrip time for each hop. If the command is unsuccessful, you can use the output to help determine at which intermediate router, forwarding failed or was slowed.
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The ping command checks the destination IP address of a host you want to reach. The ping command displays whether the destination responded and how long it took to receive a reply. If there is an error in the delivery to the destination, the ping command displays an error message
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- All three are connection devises that allow computers on a LAN to communicate. A hub is a device that floods all its ports with any traffic passed through it, i.e. all workstations have to process all IP packets. In contrast, a switch is a layer 2 device that only floods traffic to the ports that need it. This conserves bandwidth and means workstations will not have to process each and every packet passing through the switch. A router is like a switch with ability to route traffic to another LAN.