Technology

  Firewall forms the first defense against malware attack on a system. It acts as a security guard scrutinizing inbound/outbound traffic from the web. ACL (Access List) The earlier adoption to firewall, they resided in the main router.  We know data passes digitally in the form of individual packets. They contain information such as source/destination address, data type, bandwidth etc. ACL would compare each packet to a set of predefined rules, mainly in ascending order (rule1, rule 2...). If a match is found, the connection is allowed, and no further check is done. If no rule is adhered, the packet is discarded.  But this provided only basic filtering, and ACL did not care about protocol type like http or https .  Also, once the rules were set, it cannot be redefined. To edit one would be to clear the existing set and start from scratch. The era begins ... Present firewall came into existence during the late 80s, and graphical user interface (GUI) in the 90s.  ...

W hen we buy a new computer, the performance is top of the world. This is true even in case of low budget options. But as time passes, the system becomes sluggish. Browsing the web becomes a herculean task. Webpages do not load easily, and online videos keep buffering.    The above case can be due to many factors, most of which can be rectified easily.  1. Buildup of Temporary files/Cookies Whenever you browse the internet, websites you frequently visit stores, some data in your computer. This is in the form of temporary files and cookies .  Temporary files include scripts, images and cached resources that help load webpages faster, on recurrent visits.   Cookies are used to store user preferences such as themes and language settings. They are also used for targeting specific ads. Over time there will be a buildup of all these files, slowing the browser considerably. To clear these files, type " Delete browsing history " in Search Panel present in Taskbar (...