A firewall is a hardware or software device that protects a computer network from unauthorized access by preventing unauthorized users from exchanging data with other computers on the network. There are two main types of firewalls: network firewalls and host firewalls.
Network firewalls protect a single network from unauthorized access by computers on other networks. Host firewalls protect a computer from unauthorized access by other computers on the same network.
A network firewall is designed to protect a network from unauthorized access by computers on other networks. It does this by filtering traffic passing through it.
Network firewalls use one or more of the following methods to block traffic: inspection of the content of packets, examination of the source and destination addresses, and checking for specific patterns of traffic.
A host firewall is designed to protect a computer from unauthorized access by other computers on the same network.
Host firewalls use one or more of the following methods to block traffic: inspection of the content of packets, examination of the source and destination addresses, and checking for specific patterns of traffic.
There are two main types of host firewalls: application-level firewalls and content-level firewalls. Application-level firewalls are used to protect a single application from unauthorized access by other computers on the network.
Content-level firewalls are used to protect a computer’s data from unauthorized access by other computers on the network.
A firewall can be classified by the type of traffic it protects:
Network Firewall: Protects a network from unauthorized access by computers on other networks.
Host Firewall: Protects a computer from unauthorized access by other computers on the same network.
Content Firewall: Protects a computer’s data from unauthorized access by other computers on the network.
Application Firewall: Protects a single application from unauthorized access by other computers on the network.
Network Firewall:
A network firewall filters traffic passing through it. It uses one or more of the following methods to block traffic: inspection of the content of packets, examination of the source and destination addresses, and checking for specific patterns of traffic.
A network firewall can be classified by the type of traffic it protects:
Network Address Translation (NAT): Uses a translation table to change the source and destination addresses of packets as they travel across the network. This is useful if you want to allow a single computer on the network to access the internet, but want to prevent other computers on the network from accessing the internet.
Stateful Inspection: Filters packets by examining their contents, including the header and the data payload.
Packet Filtering: Filters packets by examining the information in the packets’ headers.
Application Firewall:
A application firewall is used to protect a single application from unauthorized access by other computers on the network.
Application firewalls can be classified by the type of traffic they protect:
Inline Firewall: Protects a single application from unauthorized access by other computers on the same network.
External Firewall: Protects a single application from unauthorized access by computers on other networks.
Stateless Firewall: Protects a single application from unauthorized access by computers on the same network, but does not keep track of which requests have been made by which users.
Content Firewall:
A content firewall is used to protect a computer’s data from unauthorized access by other computers on the network.
Content firewalls can be classified by the type of traffic they protect:
Inline Firewall: Protects a computer’s data from unauthorized access by other computers on the same network.
External Firewall: Protects a computer’s data from unauthorized access by computers on other networks.
Stateless Firewall: Protects a computer’s data from unauthorized access by computers on the same network, but does not keep track of which requests have been made by which users.
Conclusion.
