At which layer of the Open Systems Interconnection (OSI) model does a circuit-level firewall operate?
At which layer of the Open Systems Interconnection (OSI) model does a circuit-level firewall operate?
A circuit-level firewall operates at the Session layer (Layer 5) of the OSI model. This layer is responsible for establishing, managing, and terminating connections between two communicating hosts, which aligns with the functionality of circuit-level firewalls that work at the TCP session level to protect established sessions between hosts.
A. Session layer
A is correct
Correct answer is A
Session Layer, https://en.wikipedia.org/wiki/Circuit-level_gateway
Agree with A
I find this question to be a little tricky. Here is the reason why the answer is A and not B: Circuit-level firewalls operate at the Session layer (Layer 5) of the OSI model rather than the Network layer (Layer 3). Here's why: +Circuit-level firewalls work at the TCP session level, protecting established sessions between hosts. +The Session layer (Layer 5) deals with establishing, managing, and terminating connections between two communicating hosts. -The Network layer (Layer 3) deals with IP addresses and routing packets towards their destination. - Packet-filtering firewalls operate at Layer 3 as they simply filter packets based on source/destination IP addresses, ports, protocols.
Circuit-level firewalls operate at the Session layer (Layer 5) of the OSI model rather than the Network layer (Layer 3) .
A circuit-level firewall operates at the Session layer (Layer 5) of the OSI model.
Stateless Firewall: Layer 3 network Stateful: Layer 3 and 4, network and transport Circuit level: Layer 5 Session Aplication level: Layer 7 Application (proxy)
Answer: A. Session layer https://www.datamation.com/networks/circuit-level-gateways-definition-features-examples/#:~:text=A%20circuit%2Dlevel%20gateway%20is,between%20end%2Duser%20application%20processes.
Stupid and illogical question. From OSG (pg. 553). Circuit-Level Firewalls Circuit-level firewalls (aka circuit proxies) are used to establish communication sessions between trusted partners. 'In theory', they operate at the Session layer (layer 5) of the OSI model (although 'in reality', they operate in relation to the establishment of TCP sessions at the Transport layer [layer 4]).
layer 5. Session