To prevent intrusions, companies install combinations of hardware and software systems called firewalls. Firewalls help keep unauthorized web users from tapping into private corporate data.
Explanation
Firewalls have been used so much in the corporate world, they have become part and parcel in our lives. They can be defined as hardware or software system components designed to solely limit or prevent access deemed malicious and illegal from internal or external devices. Hackers have honed their skills and can often gain access to corporate systems and servers quickly. Without firewalls, these hackers may infiltrate your entire network and launch an attack.
All traffic coming in and leaving the network is monitored by a firewall and permits what it thinks is clean and blocks what it thinks is malicious. It acts as a barrier between you and the external network (usually the internet).
Learn more about firewall access
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<span>When you save data on a disk, the OS places it in an available storage area, or a "Sector".
Usually the computer places that data in sectors in an order and usually next to each other but that is not the case always, sometimes part/s of that data can be scattered at different places which actually slows down the computer, for which we need to </span><span>Defragment </span>the disk space.
Email header. The email header is a code snippet in an HTML email, that contains information about the sender, recipient, email's route to get to the inbox and various authentication details
Answer:
#here is code in python.
# read the food bill
tot_bill=float(input("Please enter the food bill:"))
# tax on food
tax=0.06
#choice for tip by user
choice=int(input("enter your choice for tip:(1 for 15%, 2 for 18% and 3 for 20% :)"))
// calculate the total food bill
if choice==1:
tot_food_bill=tot_bill+tot_bill*tax+tot_bill*(.15)
elif choice==2:
tot_food_bill=tot_bill+tot_bill*tax+tot_bill*(.18)
elif choice==3:
tot_food_bill=tot_bill+tot_bill*tax+tot_bill*(.2)
else:
print("invalid choice:")
#print the total food bill
print("total food bill is ",tot_food_bill)
Explanation:
Read the food bill from user and assign it to variable "tot_bill".Initialize the tax=0.06 (i.e. 6%) on the bill.Then ask user to give his choice for tip. if the choice is 1 then tip will be 15%, if 2 then 18% and if choice is 3 Then tip will be 20% of the bill.Calculate the total food bill and assign it to variable "tot_food_bill".
Output:
Please enter the food bill:100
enter your choice for tip:(1 for 15%, 2 for 18% and 3 for 20% :)2
total food bill is 124.0