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Ksju [112]
2 years ago
10

Web crawlers or spiders collect information from Web pages in an automated or semi-automated way. Only the text of Web pages is

collected by crawlers. True False
Computers and Technology
1 answer:
krek1111 [17]2 years ago
5 0

Answer:

The correct answer to the following question will be "False".

Explanation:

  • Web crawlers make copies of google search recovery pages that index the streamed pages to allow subscribers to more effectively search. It collects details of Web pages in an automatically generated or semi-automated form.
  • The code of HTML and Hyperlink can be checked by crawlers. They could be used for scraping of the web.

Therefore, the given statement is false.

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What is the software called that allows the user to create, access, and manage a database? question 8 options:
SCORPION-xisa [38]
Database management software is an application software that allows users to create, access, and manage a database, where a database is a collection of data organized in a manner that allows access, retrieval, and use of that data
<span>DBMS stands for database management software so the correct answer is B.
</span>DBMS involves <span>definition, creation, querying, update, and administration of databases.</span>
6 0
2 years ago
A human interest story is an example of hard news.<br> O True<br> O False HEL
emmainna [20.7K]

Answer:

false

Explanation:

I did this question before

5 0
2 years ago
A network administrator recently implemented two caching proxy servers on the network. how can the administrator best aggregate
Romashka [77]

The answer to this question would be:

The network administrator can best aggregate the log files from the proxy servers by “Configuring both proxy servers to log to a syslog server”.

Using the syslog server is a great method to merge logs from various sources into a single location.

4 0
2 years ago
Assume that passwords are selected from four-character combinations of 26 alphabeticcharacters. Assume that an adversary is able
tigry1 [53]

Answer:

for a) the time required is 228488.5 seconds= 63.469 hours

for b) the time required is 54 seconds

Explanation:

for a) since each combination is equally probable , then the number of possible combinations is

CT=Combinations = number of characters^length of password = 26⁴

then the number of combinations at time t will be the total , less the ones already tried:

Ct = CT - (n-1) , since n=α*t  → Ct=CT-α*t  

since each combination is equally probable , then the probability to succeed  

pt = 1/Ct = 1/ (CT- α*t +1)

but the probability of having a success in time t , means also not succeeding in the previous trials , then

Pt = pt*П(1-pk), for k=1 to t-1

Pt = 1/ (CT- α*t +1) П[1-1/ (CT- α*k +1)] = 1/ (CT- α*t +1) П[(CT- α*k )] /(CT- α*k +1)]  

since α=1 ,  

Pt = 1/ (CT- t +1) П[(CT- k )] /(CT- k +1)] = 1/ (CT- t +1)  * [CT- (t-1) ]/CT  =  1/CT

then the expected value of the random variable t= time to discover the correct password is

E(t) = ∑ t* Pt = ∑ t *1/CT , for t=1 until t=CT/α =CT

E(t) = ∑ t *(1/CT) = (1/CT) ∑ t = (1/CT) * CT*(CT+1)/2 = (CT+1)/2

therefore

E(t) = (CT+1)/2 = (26⁴ +1)/2 = 228488.5 seconds = 63.469 hours

for b)

time required = time to find character 1 + time to find character 2 +time to find character 3 +time to find character 4 = 4*time to find character

since the time to find a character is the same case as before but with CT2=Combinations = 26 ,then

t= 4*tc

E(t) = 4*E(tc) = 4*(CT2+1)/2 = 4*(26+1)/2 = 54 seconds

6 0
3 years ago
How to interchange first half of the array with second half of array in python?
damaskus [11]

Answer:

Following are the code to this question:

l= []#defining an empty list

n=int(input("Enter total element you want to insert: "))#defining variable to input total element

for i in range(0,n):# defining loop to input value in list

   insert=int(input())#defining variable insert to input value

   l.append(insert) # adding the elemenents into the list

x=n//2#calculating midpoint  

l1 =l[:x]#using slicing to hold first-half value in l1 list

l2 =l[x:]#using slicing to hold second-half value in l2 list

print("Before interchange: ")#print message

print ("list : ",l)#print input list

l3=l2 + l1#add value in l3

print("After interchange: ")#print message

#print(l3)  #print list l3

print (str(l3)[1:-1])#print list l3

Output:

please find the attachment.

Explanation:

Description of the code:

  • In the above python program, an empty list l is declared, in the next line, variable n is defined, that input the total number of the list elements. In the next line, the for loop is declared, which uses the insert variable input value and used the append method to add value in the list.
  • In the next step, the variable x is declared, which finds the midpoint of the list, and defines the l1 and l2 lists, that use slicing to hold the first and second half values.
  • In the last step, the l3 list is declared, that adds the l1 and l2 lists and use the print method to print its values.

8 0
3 years ago
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