Barrier synchronization is used to synchronize two or more processes so that all processes must finish their first phase befor any of them is allowed to start its second phase. For two processes, we might write: process P1 process P2 { { /* Phase-l */ /* Phase-l */ signal(s1); signal(s2); wait(s2); wait(s1); /* Phase-Il */ /* Phase-I| */ } }, Where s1 and s2 are two binary semaphores, both initialized to 0. Now, suppose there are four processes P1, P2, P3, and P4 all being executed in two phases. The execution of the processe must satisfy the following requirements: Process P3 must finish phase-l first, followed by process P2, which must finish Phase-l before any of the other two processes start that phase. • All phase-l's must finish before any phase-Il starts. • Phase-Il of the processes must be executed in this order: P2 first, followed by P1 or P3, and P4 last. Provide the pseudo code for your solution using semaphores. You are allowed to use any number of semaphores. N.B. You may write your answer in a different editor and then upload the document.

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Which of the following descriptions regarding the Wi-Fi router encryption are correct? Group of answer choices It uses WPA3 protocol to encrypted data. It uses WPA2 protocol to encrypted data. The crypto used in the Wi-Fi router is AES. The crypto used in the Wi-Fi router is DES.

GET requests, authoritative and root server DNS entries, and DNS queries are all covered in great detail?