If you are new to the cybersecurity world, then you may not know much about the types of firewalls. There are different types of firewalls, one of the noticeable ones is the circuit-level gateway. Indeed, it can be challenging for the new companies especially those that are searching for cybersecurity protections without facing any difference in network performance. Therefore, some questions are very normal to have like “How do firewalls work?”
The answer to this question is based on the type of firewall being discussed in this article. we are talking about a circuit-level gateway that does not work in the same way as packet filtering or stateful inspection. Hence, in return, bring to the question regarding particular firewall types like: “Which of the following are characteristics of a circuit-level gateway” or “What is a circuit-level gateway?”
Here’s An Instant Explanation Of Circuit-Level Gateways And Their Features:
What is a Circuit-Level Gateway?
Here’s a quite valuable definition of circuit-level gateways from Techopedia:
“A circuit-level gateway is a firewall that provides User Datagram Protocol (UDP) and Transmission Control Protocol (TCP) connection security and works between an Open Systems Interconnection (OSI) network model’s transport and application layers such as the session layer. Unlike application gateways, circuit-level gateways monitor TCP data packet handshaking and session fulfillment of firewall rules and policies.”
Fundamentally, a circuit-level gateway validates TCP handshakes to ensure incoming traffic without using much time and resources. This creates circuit-level gateways, one of the more capable firewall types, reducing the performance impact on your network.
Therefore, as these firewalls do not check the information packet or its contents, a packet that has the right TCP handshake, but also contains malware, could credibly get during a circuit-level gateway.
Which of the mentioned Are Characteristics of a Circuit-Level Gateway?
To allow you to visualize the difference between a circuit-level gateway and other firewalls, here’s a small chart of different firewall types:
Feature           Packet-Filtering Firewalls Circuit-Level Gateways Stateful Inspection Firewalls Application-Level Gateways (Proxy Firewall)
Destination/IP Address Check Yes No Yes Yes
TCP Handshake Check No Yes Yes Yes
Deep-Layer Inspection No No No Yes
Virtualized Connection No No No Yes
Resource Impact Minimal Minimal Small Moderate

Did you realize that “next-generation firewalls” weren’t on the list either? This is due to its difficulty to simplify regarding their capabilities since there isn’t a general agreement on what makes a firewall “next-gen.”
It’s significant to observe that these qualities are based on wide generalizations of every firewall solution. For example, even as circuit-level gateways don’t normally utilize virtualization to make an additional layer of partition between your system and incoming traffic, a particular product may use that feature or you can route all traffic via virtualized links regardless of which type of firewall you use.

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