User:DavidB4/workspace
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For study: [1] Ref grouping: [2]
A genetically modified organism (GMO) is an organism whose genetic material has been altered using recombinant DNA genetic engineering techniques. In most cases, genes are cut using the escherichia coli bacteria. Other gene sequences are then inserted into the gap created, and the gene parts are reconnected.
A firewall is a system which filters network activity and permits presumably safe internet/intranet traffic while blocking suspicious or unwanted communication.[1] There are several types of firewall and methods of filtering.
Physical and Virtual
Firewalls can be either physical devices which sit on the network between the Internet and the internal client, or software systems which are installed onto the client's device.
Hardware
Hardware firewalls are generally considered the best front-line of defense. When an incoming connection reaches the protected network, the connection must first go through this hardware firewall. If the connection is unwanted, it will generally be ignored. In this case, the entity attempting to connect will simply have their request time out. Some firewalls will outright reject the request, however, which is a less effective defense method. (If rejected outright, a potential attacker will know he has found an active device, whereas if the request is ignored, it will be more difficult to know if there is even a device to connect to.)
To the outside world, there is only one device (the firewall) on the protected network. Even when a connection is permitted, the communication still passes through the firewall using a specified port. Therefore, even active connections do not reveal the internal IP address of devices.[2]
However, many hardware firewalls (all but the newest types) often do not know what connections are being used for. Most do not collect the packets and reassemble messages, so connections can be abused without the firewall knowing. Even the ones which do attempt to analyze traffic can have difficulty understanding what is going on.[2]
Software
Software firewalls are not typically considered a good first line of defense, but a good addition to a tiered defense system. They digitally intercept and attempt to analyze traffic on the client's system. Since this kind of firewall operates on the OSI model's application layer, it has an easier time of understanding what the communication link is being used for.
However, this unwanted communication must be blocked at the computer (or mobile device), so the communication has already gotten through the hardware firewall (assuming there is one). Although the attempt was still ignored, the external entity now knows there is at least one active device at that IP address.[2]
Types
There are a number of different types of firewall. Each type attempts to protect a network using different methods.
Proxy firewall
Less for defense than for utility, the proxy firewall simply redirects certain kinds of traffic to a proxy, while letting other traffic pass directly through. This is not a type of firewall which is commonly used in modern networks, although this feature can be used in conjunction with others in a more advanced firewall system.[3]
Stateless inspection
Stateful inspection
Stateful firewalls are now considered the norm for network security. They monitor the state, port, and protocol used in all communication. They then make decisions based on context, or previous observations, as well as any rules the administrator has set.
Unified threat management
These firewalls use stateful inspection, but also offer some additional functionality. They incorporate some variety of intrusion prevention system to help prevent network penetration by attackers. They also include an antivirus solution to help keep malware out of the network.[3] Depending on the UTM system, spam blocking, suspicious file sandboxing, data loss prevention, and many other features can be built into it.[4] Additionally, they generally offer customizable, interactive reports so that administrators can easily understand and monitor activity.[5]
Next-generation
As one of the newest kinds of firewall, this type offers all of the basic protections listed above, but also has a better view into the application layer. It is capable of understanding what software is operation over the network, and detecting more sophisticated threats. Intrusion detection is also more advanced in this type of firewall.[3]
Threat-focused NGFW
As the name suggests, this type of next-generation firewall is even more focused on threat detection and remediation than its predecessors. It has better context awareness and evasion detection than any of the earlier types, and includes automated responses to penetration attempts and other unwanted communication.[3]
- â https://en.oxforddictionaries.com/definition/firewall
- â 2.0 2.1 2.2 âWhat is a Firewall?â WhatIsMyIPAddress.com, whatismyipaddress.com/firewall. Accessed 7 Sept. 2017.
- â 3.0 3.1 3.2 3.3 âWhat Is a Firewall?â Cisco, 6 Sept. 2017, www.cisco.com/c/en/us/products/security/firewalls/what-is-a-firewall.html. Accessed 7 Sept. 2017.
- â âUnified Threat Management.â WatchGuard Technologies, 25 Aug. 2017, www.watchguard.com/wgrd-solutions/unified-threat-management. Accessed 7 Sept. 2017.
- â âUnified Threat Management.â WatchGuard Technologies, 25 Aug. 2017, www.watchguard.com/wgrd-solutions/unified-threat-management. Accessed 7 Sept. 2017.