Not entirely sure about 1; I believe it's D. 2 is C, and 3 is A.
The answer is computer. A computer is made up of microchips (CPU and GPU), an operation system (macOS or Windows), input methods (keyboard and mouse), and other parts.
Answer:NULL Scan
Explanation:RFC 793(Request for comments) is a type of RFC command labeled with the number 793 which can operate with the TCP protocol.They are sort of document form which is from IETF( Internet Engineering Task Force ).
The null scan is scanning protocol used by legal as well as illegal hackers for working in the transfer control protocol architecture. It is used for the identification of the the ports and holes in TCP servers.they can also have the negative impact if used by the illegal hackers.
Answer:
Explanation:
Following are the Semaphores:
Customers: Counts waiting customers;
Barbers: Number of idle barbers (0 or 1)
mutex: Used for mutual exclusion.
Cutting: Ensures that the barber won’t cut another customer’s hair before the previous customer leaves
Shared data variable:
count_cust: Counts waiting customers. ------------copy of customers. As value of semaphores can’t access directly.
// shared data
semaphore customers = 0; semaphore barbers = 0; semaphore cutting = 0; semaphore mutex = 1;
int count_cust= 0;
void barber() {
while(true) { //shop is always open
wait(customers); //sleep when there are no waiting customers
wait(mutex); //mutex for accessing customers1
count_cust= count_cust-1; //customer left
signal(barbers);
signal(mutex);
cut_hair();
}
}
void customer() {
wait(mutex); //mutex for accessing count_cust
if (count_cust< n) {
count_cust= count_cust+1; //new customer
signal(customers); signal(mutex);
wait(barbers); //wait for available barbers get_haircut();
}
else { //do nothing (leave) when all chairs are used. signal(mutex);
}
}
cut_hair(){ waiting(cutting);
}
get_haircut(){
get hair cut for some time; signal(cutting);
}
