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Screenshot of a website blocking the creation of content which matches a regular expression term on its blacklist. In computing, a blacklist, disallowlist, blocklist, or denylist is a basic access control mechanism that allows through all elements (email addresses, users, passwords, URLs, IP addresses, domain names, file hashes, etc.), except those explicitly mentioned.
IP address blocking is commonly used to protect against brute force attacks and to prevent access by a disruptive address. It can also be used to restrict access to or from a particular geographic area; for example, syndicating content to a specific region through the use of Internet geolocation .
In a multitasking computer system, individual tasks, or threads of execution, must share the resources of the system. Shared resources include: the CPU, network and network interfaces, memory and disk. When one task is using a resource, it is generally not possible, or desirable, for another task to access it.
install internet filters or blocking software that prevents access to pictures that are: (a) obscene, (b) child pornography, or (c) harmful to minors (for computers that are accessed by minors); allow filtering or blocking to be disabled upon the request of an adult; and; adopt and enforce a policy to monitor the online activities of minors.
4. Select Add to Blocked Addresses. 5. Click Ok to confirm. Block email addresses from Settings 1. Sign in to Desktop Gold. 2. Click Settings. 3. Click Mail. 4. Click the Spam Controls tab. 5. In the box under Block mail from addresses I specify, type the email addresses that you do not wish to receive mail from. Use commas to separate email ...
Computer network attacks: Denial-of-service attacks and attacks that deface opposition websites can produce the same result as other blocking techniques, preventing or limiting access to certain websites or other online services, although only for a limited period of time. This technique might be used during the lead up to an election or some ...