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Tech Education: What Is A Firewall?
Firewalls were developed over thirty years ago and function as the first line of defense for many business networks. This piece of network equipment is a perimeter defense that determines whether packets can move into or out of the network. While the basic concept of a firewall is simple, the way that it performs this […]
Tech Education: What Is A Firewall?
BYDaniel De Steno|April 16, 2019|Business IT Articles, News, and Tips
Firewalls were developed over thirty years ago and function as the first line of defense for many business networks. This piece of network equipment is a perimeter defense that determines whether packets can move into or out of the network. While the basic concept of a firewall is simple, the way that it performs this function and the features it offers continue to evolve based on current threats.
Types of Firewalls
Firewalls come in two major categories: hardware and software. The physical firewalls are network appliances that connect to the rest of the IT infrastructure so it’s able to monitor packets. There are several methods they can use to secure the network and assist with thwarting potential intruders.
Hardware Firewalls
Stateful
Stateful firewalls retain information about the connections being made. It offers good performance because this technology allows it to skip inspecting every single packet. Once it has inspected a connection, it allows it for subsequent packets.
Application-level
Application-level firewalls that are hardware based are designed to protect the application’s connections. They address common attack methods used on that type of application, such as stopping cross-site scripting for a web application.
Proxy
When someone thinks about a standard firewall, a proxy firewall is most likely what’s on their mind. It stands between a host device and the data source and inspects the packets that are sent between them. This type of firewall may not stand up to complex attacks due to its simplicity, but it masks a lot of the network information.
Circuit-level
This firewall is another basic one that focuses on checking the TCP handshake. It’s not resource intensive since it doesn’t look at the packet, but that does mean that it won’t protect against sophisticated attacks.
Next Generation
These firewalls have advanced features that give businesses more ways to stop malicious traffic from making it through the appliance. Some examples of these include deep packet inspection, checking attachments in sandboxes, and terminating encrypted traffic. Third-party data can be incorporated into the rules and filters of the firewall to improve protection against emerging threats. They can also incorporate technology that is found in other types of IT security hardware, such as intrusion detection. The drawback of this firewall type is that it can significantly slow down network traffic.
Software-based Firewalls
Virtual Appliance
This firewall is a software package that’s installed on the business network and does not rely on a hardware appliance for protecting traffic.
Application-level
Some applications have firewalls built into the software itself to act as a second layer of protection. Anything that gets through the physical firewall of the business network and reaches the application layer needs to go through another inspection. These firewalls focus on threats that are most common for that piece of software.
Cloud-based
A cloud-based firewall leverages cloud computing technology for the virtual appliance. Some advantages of a cloud firewall include the ability to scale quickly, high availability, and cost-efficiency. For organizations with limited IT budgets, using a cloud-based service can give them access to powerful features that they wouldn’t have access to without paying a substantial upfront hardware fee.
The right firewall for your organization depends on the typical threats that you face, the sensitivity of the information you’re protecting, and your performance requirements.
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NOVA-MAINTAIN Program Terms and Conditions
This Agreement was entered between NOVA Computer Solutions L.L.C. referred to as “NOVA” and the above referenced client also referred to as “Client”. The parties agree to abide by the terms and conditions as set forth in this agreement.
Period of the Agreement: This Agreement is effective as of the contract effective date and remains in effect for 36 months. The contract is renewed automatically after the initial 36 months on a 12 month basis. Upon termination there shall be no refund or credits allowed.
System Maintenance Services: Professional services include, but are not limited to time spent – either at Client or NOVA’s site. (a) Exclusions: Unless so specified, the Covered System does not include any cabling, or any wiring external to the Covered System, telecommunications devices (including modems), peripheral equipment, software. In no event shall the Covered System include removable magnetic or optical media, ink ribbons, toner cartridges, paper or other supplies, expendables or services.
System Maintenance Services: NOVA shall perform Virtual Maintenance Services at least once per month. If client experiences a Major Alarms the client will notify NOVA by telephone. Client shall cooperate with NOVA’s reasonable requests for assistance to determine the cause of the reported problem and whether an on-site Maintenance Service visit is required. NOVA may assist Client with additional services outside the scope of the Maintenance Services. This assistance will be billed at NOVA’s prevailing hourly rate.
Fees: The monthly Fee shall be invoiced in full at the beginning of every month. Any other amounts due hereunder, including the applicable Surcharge Rate or any reimbursable out-of-pocket costs, shall be invoiced monthly as well. The rate for additional time needed per month for System Maintenance Services will depend on the package you select. No Travel Cost Within in 25 Miles of Primary Support Office, Discounted Rate for over 25 miles.
Certain Client Responsibilities: Client shall ensure that: (I) all software and hardware is installed and operated according to applicable manufacturer specifications; (ii) all upgrades and releases have been properly installed; (iii) a uninterrupted and suitable power supply and other environmental conditions have been implemented and maintained; (iv) suitable surge protection devices have been implemented; (v) no other equipment or software having an adverse impact on the system have been introduced; (vi) no repair attempts or other changes have been made other than by or with the express approval of NOVA or the applicable manufacturer, (vii) the systems haven’t been mishandled, neglected, abused, damaged by fire, lightning or water, or otherwise subjected to unusual electrical or physical stress (viii) Client periodically makes and stores in a safe place archival copies of all software and all valuable data. (a) Failure to Comply. NOVA may refuse to provide Service or may treat any such work as Other Billable Maintenance Service at NOVA’s prevailing hourly rate.
Cancellation Policy: NOVA or Customer may cancel this contract for any reason with 90 days written notification.
Limited Warranty: Client must notify NOVA of any dissatisfaction, problems, or concerns within 3 days of the date the services were provided. Client will grant NOVA a reasonable amount of time to resolve problem to Client’s satisfaction. NOVA represents and warrants that it will use its best efforts to perform Maintenance Services in a competent and workmanlike manner.
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Fee Increases: This contract has an automatic 5% increase yearly and NOVA reserves the right to revise fees at any time. NOVA will provide the Client of the updated fee’s, other than the automatic yearly increase, fifteen (15) days prior to the next month’s invoice.
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