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firewall
A firewall intercepts and controls traffic between networks with differing levels of trust. It is part of the network perimeter defense of an organization and should enforce a network security policy.
Yes. The other is to allow. Firewalls block and allow network traffic by type (TCP/UDP) and/or port number and/or IP address.
probably the best solution is to use a firewall that notifies you about outbound connections and to use a firewall between you and the internet that is not part of your computer on which you block all unnecessary outbound ports you may also install an ids that can tell you when outbound traffic on a port is abnormally high you might even be able to configure an ips to block the traffic
As you have probably noticed, is it not easy anymore with a standard firewall to block these kinds of applications. A few years a new trend has been launched so that most appliacations will pass port 80 (http) or 443 (https) . A good example for this is skype. In 2010 you could block the Skype service by blocking a port on your firewall. Now these days skype works on port 443 (Https). So with a regular firewall you can't see iif the HTTPS legimate or not.You have newer firewalls ( brands like Palo Alto, Juniper Networks, Barracuda Networks, ...) who have build a new kind of firewall (they call it the next generation firewall). It gives you the possibilty to define traffic and create policies for these kind of traffic depending on your LDAP structure.Conclusion:If you have a standard firewall: noIf you have a NG firewall: Yes
A firewall can block/open particular ports without prejudice. Yes, a firewall does determine if network traffic should continue through to the destination or be stopped. Therefore keeping unwanted materials out. Yes, firewalls are in charge of deciding whether a piece of network traffic should be allowed past the firewall to travel onwards to its destination or if it should be stopped. Rules can be set at the firewall to prevent traffic from entering your local network that you do not want to. A modern firewall can be programmed to block or or pass through (with or without modification) packet traffic based on its source or its destination or both. It can select packets based on an IP address, a range of ip addresses, network or subnet. It can use port numbers to filter or redirect packets to specific ip addresses. Better ones can select packets based on the domain name, or part of it or even block based on the contents of a web page. Of course, it may also block access to a really nice chicken breast recipe because of one word. Some firewalls can even filter based on the category association of a host or domain name. For example, you can block web sites that involve drugs and alcohol, or sites associated with sex and nudity.
heater hose
A firewall is the tool that blocks ports, programs, or any other network traffic from incoming or outgoing connections.
Generally traffic exiting a LAN is controlled at the router or firewall by setting rules in the configuration files for the router or firewall restricting what IP addresses traffic can be sent to, what devices outbound traffic can be sent from. You can also set rules controlling what outbound ports, protocols, and services will be blocked or allowed. Generally the best way to configure is "deny all and allow by exception" where all traffic is blocked by default and then rules are inserted to allow exceptions for specific traffic. You would also insert settings into the Access Control List.
No
No
At the very back of the engine block by the firewall At the very back of the engine block by the firewall