Answer : The securtiy of the password can be maitained by the shadow files such as:-
- max is for the days that represent that the same password can be used without the need for changing it
- min is for the days that represent waiting days before the changing of password after he/she gets a new password
- warn are the days that come with Waring sign that the password is going to expire soon.
For a certain period of time , the user can access the log in when the password has expired . If that period is timed out then there will be no log in option and the account gets disabled.
Answer:
Boolean Operators
Explanation:
When performing a boolean search, boolean operators allow users to combine keywords with operators (or modifiers) such as AND, NOT and OR to further produce more relevant results.
The boolean operators AND and OR are used to include certain words and phrases during the search while the boolean operator NOT is used to exclude certain words and phrases.
Answer:
def newton(n):
#Define the variables.
t = 0.000001
esti = 1.0
#Calculate the square root
#using newton method.
while True:
esti = (esti + n / esti) / 2
dif = abs(n - esti ** 2)
if dif <= t:
break
#Return the result.
return esti
#Define the main function.
def main():
#Continue until user press enters.
while True:
try:
#Prompt the user for input.
n = int(input("Enter a number (Press Enter to stop):"))
#display the results.
print("newton = %0.15f" % newton(n))
except:
return
#Call the main function.
main()
Answer:
education purposes
Explanation:
Education institutes make some programs like School of the Air and College of the Air, forums, and discussion tables, in 1940 the FCC reserved a range of the FM radio spectrum for education purposes.
Although FM was unpopular when the FCC moved the FM bandwidth to a higher set of frequencies, and people and consumer stations had to buy new equipment.
Using e-mail to send messages is the best choice to convey urgent and highly sensitive information. E-mail is just a conversation between you and the recipient. So it is the best when it comes to when you are sending a highly sensitive information. While telephone fax letter and dispatch radio may need to use a mediator to transfer messages which violates the confidentiality of the information.
