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2 years ago

How are phishing, ransomware and distributed- denial of service attack alike and different?

Computers and Technology

1 answer:

Aleks04 [339]2 years ago

8 0

Answer:

Phishing means cyber theft in which the cyber thief sends the target PC a malicious email, which looks like coming from some known source, and they ask for certain critical information, which must not be leaked. Similarly, In ransomware, they send the phishing email with malicious code, and they hack the computer system. They then ask for a ransom as a return for reactivating your PC. Distributed Denial of service attack happens when the traffic flood the bandwidth and the resources of a PC, and finally a lot of are denied of access to them. Ransomware, when it attacks a bank account, becomes a Denial of service attack, as multiple users are stopped from accessing their account. All of these are hence, almost the same and revolves around the phishing email.

Explanation:

Please check the answer.

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According to the order of operation in Excel: a. Excel performs exponentiation, then multiplication, then division, then subtrac

Ilya [14]

Answer:

Option is b is correct answer. Excel performs exponentiation, then multiplication and division, then addition, and subtraction, it is correct order of operation in Excel. It is important to remember when you write any formula in Excel having different mathematical operators like +/ -/ ^/ etc, it follows a specific order and performs calculations in specific order which is termed as order of operator precedence. Each of mathematical operator has its precedence and executes in a special order set by Excel.

Explanation:

As we already know order of precedence of each mathematical operator is different in Excel. The order of operations for Excel is as follows:

Evaluate elements in parentheses.
Evaluate 'ranges' ().
Evaluate 'intersections' (empty spaces).
Evaluate 'unions' (,).
Perform negation (-).
determine percentages (%).
Perform exponentiation (^).
Perform multiplication (*) and division (/), both are of equal precedence.
Perform addition (+) and subtraction (-), both are of equal precedence.
Evaluate text operators like (&).

Perform comparisons like (=, <>, <=, >=).

Answer details

Grade: Middle

Subject: Computers and Technology

Chapter: Order of precedence of mathematical operators

Keywords: precedence in Excel, operators precedence etc

7 0

3 years ago

Consider a single CPU system with an active process A. Explain what happens in the following circumstances including any interru

Anika [276]

Answer:

The answer to this question as follows:

Explanation:

In option a, When we use fork, a new mechanism, that uses fork() method, which is in the parental process, to replicate all sites. It has been installed in a space-differentiating operating system.

In option b, It is the present system cycle that scan and wait for any of the system processor to be installed.

In option c, The time delay happens when A operates. It is a global that make issues, which are cleared and slowed down when an interrupt happens. In this process, there are not any distractions. It splits into slowly as it heads into the ISR. It helps to understand the code easily.

5 0

3 years ago

A datagram network allows routers to drop packets whenever they need to. The probability of a router discarding a packetis p. Co

tresset_1 [31]

Answer:

a.) k² - 3k + 3

b.) 1/(1 - k)²

c.) $k^{2} - 3k + 3 * \frac{1}{(1 - k)^{2} }\\\\= \frac{k^{2} - 3k + 3 }{(1-k)^{2} }$

Explanation:

a.) A packet can make 1,2 or 3 hops

probability of 1 hop = k ...(1)

probability of 2 hops = k(1-k) ...(2)

probability of 3 hops = (1-k)²...(3)

Average number of probabilities = (1 x prob. of 1 hop) + (2 x prob. of 2 hops) + (3 x prob. of 3 hops)

= (1 × k) + (2 × k × (1 - k)) + (3 × (1-k)²)

= k + 2k - 2k² + 3(1 + k² - 2k)

∴mean number of hops = k² - 3k + 3

b.) from (a) above, the mean number of hops when transmitting a packet is k² - 3k + 3

if k = 0 then number of hops is 3

if k = 1 then number of hops is (1 - 3 + 3) = 1

multiple transmissions can be needed if K is between 0 and 1

The probability of successful transmissions through the entire path is (1 - k)²

for one transmission, the probility of success is (1 - k)²

for two transmissions, the probility of success is 2(1 - k)²(1 - (1-k)²)

for three transmissions, the probility of success is 3(1 - k)²(1 - (1-k)²)² and so on

∴ for transmitting a single packet, it makes:

∞ n-1

T = ∑ n(1 - k)²(1 - (1 - k)²)

n-1

= 1/(1 - k)²

c.) Mean number of required packet = ( mean number of hops when transmitting a packet × mean number of transmissions by a packet)

from (a) above, mean number of hops when transmitting a packet = k² - 3k + 3

from (b) above, mean number of transmissions by a packet = 1/(1 - k)²

substituting: mean number of required packet = $k^{2} - 3k + 3 * \frac{1}{(1 - k)^{2} }\\\\= \frac{k^{2} - 3k + 3 }{(1-k)^{2} }$

6 0

3 years ago

Which statement is correct about operating systems? They are hardware devices. They include programs that help people do certain

katrin2010 [14]

<span>They include programs that help people do certain tasks. They include programs that control a computer. They store information being used by the CPU.</span>

3 0

2 years ago

Is C++ a high-level or low-level programming language? What about HTML?

N76 [4]

Answer:

c++ is low level

html high level

Explanation:

6 0

2 years ago