Answer:
In addition, a few modern printers can directly interface to electronic media such as memory cards, or to image capture devices such as digital cameras, scanners; some printers are combined with a scanners and/or fax machines in a single unit, and can function as photocopiers.
1. What is memory mapped I/O?
Answer:
Memory-mapped I/O and port-mapped I/O are two complementary methods of performing input/output between the central processing unit and peripheral devices in a computer. An alternative approach is using dedicated I/O processors, commonly known as channels on mainframe computers, which execute their own instructions.
Validate that the user age field is at least 21 and at most 35. If valid, set the background of the field to LightGreen and assign true to userAgeValid. Otherwise, set the background to Orange and userAgeValid to false.HTML JavaScript 1 var validColor-"LightGreen"; 2 var invalidColor"Orange" 3 var userAgeInput -document.getElementByIdC"userAge"); 4 var formWidget -document.getElementByIdC"userForm"); 5 var userAgeValid - false; 7 function userAgeCheck(event) 10 11 function formCheck(event) 12 if (luserAgeValid) { 13 14 15 16 17 userAgeInput.addEventListener("input", userAgeCheck); 18 formWidget.addEventListener('submit', formCheck); event.preventDefault); 3 Check Iry again
Answer:
Explanation:
The code provided had many errors. I fixed the errors and changed the userAgeCheck function as requested. Checking the age of that the user has passed as an input and changing the variables as needed depending on the age. The background color that was changed was for the form field as the question was not very specific on which field needed to be changed. The piece of the code that was created can be seen in the attached image below.
var validColor = "LightGreen";
var invalidColor = "Orange";
var userAgeInput = document.getElementById("userAge");
var formWidget = document.getElementById("userForm");
var userAgeValid = false;
function userAgeCheck(event) {
if ((userAgeInput >= 25) && (userAgeInput <= 35)) {
document.getElementById("userForm").style.backgroundColor = validColor;
userAgeValid = true;
} else {
document.getElementById("userForm").style.backgroundColor = invalidColor;
userAgeValid = false;
}
};
function formCheck(event) {};
if (!userAgeValid) {
userAgeInput.addEventListener("input", userAgeCheck);
formWidget.addEventListener('submit', formCheck);
event.preventDefault();
}
Write a simple nested loop example that sums the even and odd numbers between 5 and 15 and prints out the computation.
Answer:
for e in range(6, 15, 2):
for o in range(5, 15, 2):
calc = e+o
print(e, "+", o, "=", calc)
Explanation:
A technician needs to manage a Linux-based system from the GUI remotely. Which of the technician should the technician deploy
Complete Question:
A technician needs to manage a Linux-based system from the GUI remotely. Which of the following technologies should the technician deploy?
A. RDP
B. SSH
C. VNC
D. Telnet
Answer:
Managing a Linux-based System from the GUI Remotely
The technology that the technician should deploy to manage the Graphic User Interface (GUI) remotely is:
C. VNC
Explanation:
VNC stands for Virtual Network Computing. This computing technology enables a remote user to access and control another computer to execute commands. It acts as a cross-platform screen-sharing system and is used to remotely access and control another computer. VNC makes a computer screen, keyboard, and mouse available to be seen and used from a remote distance. The remote user does everything from a secondary device without being in front of the primary computer or device. An example of a good VNC is TeamViewer.
It is common for people to name directories as dir1, dir2, and so on. When there are ten or more directories, the operating system displays them in dictionary order, as dir1, dir10, dir11, dir12, dir2, dir3, and so on. That is irritating, and it is easy to fix. Provide a comparator that compares strings that end in digit sequences in a way that makes sense to a human. First compare the part before the digit as strings, and then compare the numeric values of the digits.
Your program should work with the provided test program
DirectorySortDemo.java.
Call the class you write DirectoryComparator.java.
Submit the two files in your submission.
DirectoryComparator.java
DirectorySortDemo.java
import java.util.ArrayList;
import java.util.Arrays;
import java.util.collections;
public class DirectorySortDemo
{
public static void main (String [] args)
{
String dirNames ("dir12", "dir5", "dir9", "dirl", "dir4",
"lab10", "1ab2", "lab7", "lab17", "lab8",
"quiz8", "quiz10", "quiz11", "quiz12",
"dirll", "dir8", "dir7", "dir15", "dir3");
ArrayList directories = new
ArrayList<> (Arrays.asList (dirNames));
System.out.println ("Unsorted List:");
System.out.println (directories);
Collections.sort (directories, new DirectoryComparator ());
System.out.println ():
System.out-println ("Sorted List: ");
System.out.-println (directories);
Answer:
Here the code is given as follows,
Explanation:
describe the evolution of computers.
Answer:
First remove ur mask then am to give you the evolutions
A _____ is a systematic and methodical evaluation of the exposure of assets to attackers, forces of nature, or any other entity that is a potential harm.
Answer:
Vulnerability assessment
Explanation:
Cyber security can be defined as preventive practice of protecting computers, software programs, electronic devices, networks, servers and data from potential theft, attack, damage, or unauthorized access by using a body of technology, frameworks, processes and network engineers.
Some examples of cyber attacks are phishing, zero-day exploits, denial of service, man in the middle, cryptojacking, malware, SQL injection, spoofing etc.
A vulnerability assessment is a systematic and methodical evaluation used by network security experts to determine the exposure of network assets such as routers, switches, computer systems, etc., to attackers, forces of nature, or any other entity that is capable of causing harm i.e potential harms. Thus, vulnerability assessment simply analyzes and evaluate the network assets of an individual or business entity in order to gather information on how exposed these assets are to hackers, potential attackers, or other entities that poses a threat.
In the backward chaining technique, used by the inference engine component of an expert system, the expert system starts with the goal, which is the _____ part, and backtracks to find the right solution.
Explanation:
In the backward chaining technique, used by the inference engine component of an expert system, the expert system starts with the goal, which is the then part,
Backward chaining is the process of working backward from the goal. It is used s an artificial intelligence application and proof application. The backward chaining can be implemented in logic programming.
The expert system starts with a goal and then parts and backtracks. to find the right solution. Hence is a problem-solving technique. in order to find the right solution.Hence the then part is the correct answer.
Learn more about the backward chaining technique,
brainly.com/question/24178695.
Would you prefer to use an integrated router, switch, and firewall configuration for a home network, or would you prefer to operate them as separate systems
Answer:
I would prefer to use an integrated router, switch, and firewall configuration for a home network instead of operating my home devices as separate systems.
Explanation:
Operating your home devices as separate systems does not offer the required good service in information sharing. To share the internet connection among the home devices, thereby making it cheaper for family members to access the internet with one Internet Service Provider (ISP) account rather than multiple accounts, a home network is required. A home network will always require a network firewall to protect the internal/private LAN from outside attack and to prevent important data from leaking out to the outside world.
Your network has four Hyper-V hosts, which are running three domain controllers and about 10 member servers. Three of the member servers named HR1, HR2, and HR3 are running on a Windows Server 2012 R2 Hyper-V host; the others are running on Windows Server 2016 Hyper-V hosts. All VMs are running Windows Server 2016. You are currently running an enterprise human resources application on the HR1, HR2, and HR3 servers. You are considering upgrading this application to a new version that was recently released. Before you proceed with the upgrade, you set up a test environment consisting of a Windows Server 2016 Hyper-V host and three VMs. You haven't been using checkpoints on any of your VMs, but you want to start doing so as an extra form of disaster recovery in the event of VM corruption or errors introduced by updates. On your test environment, you want to use checkpoints while you are testing the new application. What type of checkpoints should you use throughout your live network and test network? Explain.
Answer:
Explanation:
g 1-4 Which piece of network hardware breaks a network up into separate collision domains within a single broadcast domain
Answer:
A switch
Explanation:
A local area network (LAN) refers to a group of personal computers (PCs) or terminals that are located within the same general area and connected by a common network cable (communication circuit), so that they can exchange information from one node of the network to another. A local area network (LAN) is typically used in small or limited areas such as a set of rooms, a single building, school, hospital, or a set of well-connected buildings. Some of the network devices or equipments used in a local area network (LAN) includes an access point, personal computers, a hub, a router, printer, a switch, etc.
In computer networking, a switch is a network hardware (device) that breaks up a network into separate collision domains within a single broadcast domain. Thus, it's commonly configured with virtual local area network (VLAN) to break up and interconnect multiple networks.
Analyze the following code:
// Enter an integer Scanner input = new Scanner(System.in);
int number = input.nextInt(); if (number <= 0) System.out.println(number);
1) The if statement is wrong, because it does not have the else clause;
2) System.out.println(number); must be placed inside braces;
3) If number is zero, number is displayed;
4) If number is positive, number is displayed.
5) number entered from the input cannot be negative.
Answer:
3) If number is zero, number is displayed;
Explanation:
The code snippet created is supposed to take any input number from the user (positive or negative) and print it to the console if it is less than 0. In this code the IF statement does not need an else clause and will work regardless. The System.out.println() statement does not need to be inside braces since it is a simple one line statement. Therefore, the only statement in the question that is actually true would be ...
3) If number is zero, number is displayed;
Answer:
If number is zero, number is displayed
Explanation:
Given
The above code segment
Required
What is true about the code segment
Analyzing the options, we have:
(1) Wrong statement because there is no else clause
The above statement is not a requirement for an if statement to be valid; i.e. an if statement can stand alone in a program
Hence, (1) is false
(2) The print statement must be in { }
There is only one statement (i.e. the print statement) after the if clause. Since the statement is just one, then the print statement does not have to be in {} to be valid.
Hence, (2) is false
(3) number is displayed, if input is 0
In the analysis of the program, we have: number <=0
i.e. the if statement is true for only inputs less than 0 or 0.
Hence, number will be printed and (3) is false
(4) number is displayed for positive inputs
The valid inputs have been explained in (3) above;
Hence, (4) is false.
(5) is also false
You are developing a Windows forms application used by a government agency. You need to develop a distinct user interface element that accepts user input. This user interface will be reused across several other applications in the organization. None of the controls in the Visual Studio toolbox meets your requirements; you need to develop all your code in house.
Required:
What actions should you take?
Answer:
The answer is "Developing the custom control for the user interface"
Explanation:
The major difference between customized control & user control would be that it inherit throughout the inheritance tree at different levels. Usually, a custom power comes from the system. Windows. UserControl is a system inheritance.
Using accuracy up is the major reason for designing a custom UI control. Developers must know how to use the API alone without reading the code for your component. All public methods and features of a custom control will be included in your API.
Which information can you apply to every page of your document with the page layout options?
header
conclusion
body
footer
introduction
Answer:
Header and footer
Explanation:
The page layout tab usually found in document programs such as Microsoft Word hold options used to configure several page options which is to be applied to a document. The page layout option gives users options to set page margins, orientation, page numbering, indentation and the other page layout options which is primarily how we would like our document to look like when printed. The page layout option also allows the insertion of a header and footer which is a note which can be written at the topmost and bottomost part of the document. Once, a header and footer option is selected, it is applied to every page of the document being worked on at the moment.
Being the Sales Manager of a company you have to hire more salesperson for the company to expand the sales territory. Kindly suggest an effective Recruitment and Selection Process to HR by explaining the all the stages in detail.
Answer:
1. Identification of a vacancy and development of the job description.
2. Recruitment planning
3. Advertising
4. Assessment and Interview of applicants
5. Selection and Appointment of candidates
6. Onboarding
Explanation:
The Recruitment process refers to all the stages in the planning, assessment, and absorption of candidates in an organization. The stages involved include;
1. Identification of a vacancy and development of the job description: This is the stage where an obvious need in the organization is identified and the duties of the job requirement are stipulated.
2. Recruitment planning: This is the stage where the HR team comes together to discuss the specific ways they can attract qualified candidates for the job.
3. Advertising: The HR team at this point seeks out job sites, newspapers, and other platforms that will make the opportunities accessible to applicants.
4. Assessment and Interview of applicants: Assessments are conducted to gauge the candidates' knowledge and thinking abilities. This will provide insight into their suitability for the job.
5. Selection and Appointment of candidates: Successful candidates are appointed to their respective positions. A letter of appointment is given.
6. Onboarding: Candidates are trained and guided as to the best ways of discharging their duties.
Write a Python program square_root.py that asks a user for an integer n greater or equal to 1. The program should then print the square root of all the odd numbers between 1 and n (Including n if n is odd). Print the square roots rounded up with no more than two digits after the decimal point.
Answer:
import math
n = int(input("Enter n: "))
for number in range(1, n+1):
if number % 2 == 1:
print("{:.2f}".format(math.sqrt(number)), end=" ")
Explanation:
In order to calculate the square roots of the numbers, import math. Note that math.sqrt() calculates and gives the square root of the given number as a parameter
Ask the user to enter the n
Create a for loop that iterates from 1 to n+1 (Since n is included, you need to write n+1)
Inside the loop, check whether the number is odd or not using the if structure and modulo. If the number is odd, calculate its square root using the math.sqrt() and print the result with two digits after the decimal
In python,
Here's some fake data.
df = {'country': ['US', 'US', 'US', 'US', 'UK', 'UK', 'UK'],
'year': [2008, 2009, 2010, 2011, 2008, 2009, 2010],
'Happiness': [4.64, 4.42, 3.25, 3.08, 3.66, 4.08, 4.09],
'Positive': [0.85, 0.7, 0.54, 0.07, 0.1, 0.92, 0.94],
'Negative': [0.49, 0.09, 0.12, 0.32, 0.43, 0.21, 0.31],
'LogGDP': [8.66, 8.23, 7.29, 8.3, 8.27, 6.38, 6.09],
'Support': [0.24, 0.92, 0.54, 0.55, 0.6, 0.38, 0.63],
'Life': [51.95, 55.54, 52.48, 53.71, 50.18, 49.12, 55.84],
'Freedom': [0.65, 0.44, 0.06, 0.5, 0.52, 0.79, 0.63, ],
'Generosity': [0.07, 0.01, 0.06, 0.28, 0.36, 0.33, 0.26],
'Corruption': [0.97, 0.23, 0.66, 0.12, 0.06, 0.87, 0.53]}
I have a list of happiness and six explanatory vars.
exp_vars = ['Happiness', 'LogGDP', 'Support', 'Life', 'Freedom', 'Generosity', 'Corruption']
1. Define a variable called explanatory_vars that contains the list of the 6 key explanatory variables
2. Define a variable called plot_vars that contains Happiness and each of the explanatory variables. (Hint: recall that you can concatenate Python lists using the addition (+) operator.)
3. Using sns.pairplot, make a pairwise scatterplot for the WHR data frame over the variables of interest, namely the plot_vars. To add additional information, set the hue option to reflect the year of each data point, so that trends over time might become apparent. It will also be useful to include the options dropna=True and palette='Blues'.
Answer:
Here the answer is given as follows,
Explanation:
import seaborn as sns
import pandas as pd
df = {'country': ['US', 'US', 'US', 'US', 'UK', 'UK', 'UK'],
'year': [2008, 2009, 2010, 2011, 2008, 2009, 2010],
'Happiness': [4.64, 4.42, 3.25, 3.08, 3.66, 4.08, 4.09],
'Positive': [0.85, 0.7, 0.54, 0.07, 0.1, 0.92, 0.94],
'Negative': [0.49, 0.09, 0.12, 0.32, 0.43, 0.21, 0.31],
'LogGDP': [8.66, 8.23, 7.29, 8.3, 8.27, 6.38, 6.09],
'Support': [0.24, 0.92, 0.54, 0.55, 0.6, 0.38, 0.63],
'Life': [51.95, 55.54, 52.48, 53.71, 50.18, 49.12, 55.84],
'Freedom': [0.65, 0.44, 0.06, 0.5, 0.52, 0.79, 0.63, ],
'Generosity': [0.07, 0.01, 0.06, 0.28, 0.36, 0.33, 0.26],
'Corruption': [0.97, 0.23, 0.66, 0.12, 0.06, 0.87, 0.53]}
dataFrame = pd.DataFrame.from_dict(df)
explanatory_vars = ['LogGDP', 'Support', 'Life', 'Freedom', 'Generosity', 'Corruption']
plot_vars = ['Happiness'] + explanatory_vars
sns.pairplot(dataFrame,
x_vars = explanatory_vars,
dropna=True,
palette="Blues")
Complete the implementation of the following methods:__init__hasNext()next()getFirstToken()getNextToken()nextChar()skipWhiteSpace()getInteger()
From method names, I am compelled to believe you are creating some sort of a Lexer object. Generally you implement Lexer with stratified design. First consumption of characters, then tokens (made out of characters), then optionally constructs made out of tokens.
Hope this helps.
Giải thích mục đích của các thao tác open() và close().
Answer:
Which lan is it
Answer:
Đang học năm nhất trường TDT đúng k bạn :D
Explanation:
(Count the occurrences of words in a text file) Rewrite Listing 21.9 to read the text from a text file. The text file is passed as a command-line argument. Words are delimited by whitespace characters, punctuation marks (, ; . : ?), quotation marks (' "), and parentheses. Count the words in a case-sensitive fashion (e.g., consider Good and good to be the same word). The words must start with a letter. Display the output of words in alphabetical order, with each word preceded by the number of times it occurs.
I ran my version of the program solution on its own Java source file to produce the following sample output:
C:\Users\......\Desktop>java CountOccurrenceOfWords CountOccurrenceOfWords.java
Display words and their count in ascending order of the words
1 a
1 alphabetical
1 an
2 and
3 args
2 as
1 ascending
1 catch
1 class
4 count
2 countoccurrenceofwords
1 create
1 display
1 else
3 entry
3 entryset
2 ex
1 exception
1 exit
1 file
2 filename
3 for
1 fullfilename
3 get
1 getkey
1 getvalue
1 hasnext
1 hold
5 i
3 if
2 import
2 in
3 input
2 int
1 io
3 java
6 key
3 length
2 line
1 main
3 map
1 matches
3 new
1 nextline
1 null
1 of
2 order
3 out
3 println
1 printstacktrace
2 public
2 put
2 scanner
1 set
1 split
1 static
5 string
4 system
2 the
1 their
1 to
1 tolowercase
2 tree
6 treemap
2 trim
1 try
1 util
1 value
1 void
1 while
9 words
C:\Users\......\Desktop>
Answer:
Explanation:
The following is written in Java. It uses File input, to get the file and read every line in the file. It adds all the lines into a variable called fullString. Then it uses regex to split the string into separate words. Finally, it maps the words into an array that counts all the words and how many times they appear. A test case has been created and the output can be seen in the attached image below. Due to technical difficulties I have added the code as a txt file below.
You've arrived on site to a WAN installation where you will be performing maintenance operations. You have been told the WAN protocol in use allows multiple Layer 3 protocols and uses routers that use labels in the frame headers to make routing decisions. What WAN technology is in use
Answer:
The answer is "MPLS".
Explanation:
The MPLS stands for Multiprotocol Label Switching. This packet switching method facilitates the generation of easier personal backbones using a less physical channel, which sends information from one source to its destination with labels rather than IP addresses. Many of these WAN services are sold through huge companies. It is also a technology for data transfer that boosts speed and regulates network traffic flow. The information is directed with this technology via a label rather than needing complicated surveys at every stop in a route cache.
The values of existing data can be modified using the SQL ________ command, which can be used to change several column values at once.
Answer:
The values of existing data can be modified using the SQL ___Update_____ command, which can be used to change several column values at once.
Explanation:
However, if you are interested in modifying some columns, then you must specify the columns of interest by using Update (table name) Set column1, column2, etc., which assigns a new value for the columns that you want to update, with each column value separated by a comma. The SQL (Structured Query Language) Update command is used to update data of an existing database table.
Program to calculate series 10+9+8+...+n" in java with output
Answer:
import java.util.Scanner;
class Main {
public static int calcSeries(int n) {
int sum = 0;
for(int i=10; i>=n; i--) {
sum += i;
}
return sum;
}
public static void main(String[] args) {
Scanner reader = new Scanner(System.in);
int n = 0;
do {
System.out.print("Enter n: ");
n = reader.nextInt();
if (n >= 10) {
System.out.println("Please enter a value lower than 10.");
}
} while (n >= 10);
reader.close();
System.out.printf("sum: %d\n", calcSeries(n));
}
}
This means that the surface area is composed of the base area (i.e., the area of bottom square) plus the side area (i.e., the sum of the areas of all four triangles). You are given the following incomplete code to calculate and print out the total surface area of a square pyramid: linclude > h: base azea- calcBasekrea (a) : cout << "Base auxface area of the squaze pyzamid is" << base area << "square feet."< endi: // add your funetion call to calculate the side ares and assign // the zesult to side area, and then print the result //hdd your function call to print the total surface area return 0F float calcBaseArea (float a) return pou (a, 2) /I add your function definicion for calcSideärea here // add your function definition tor prntSurfârea here This code prompts for, and reads in the side length of the base (a) and height of a square pyramid (h) in feet, and then calculates the surface area. The function prototype (i.e. function declaration), function definition, and function call to calculate and print the base area has already been completed for you. In the above program, a and h are declared in the main function and are local to main. Since a is a local variable, notice how the length a must be passed to calcBaseArea to make this calculation. One of your tasks is to add a new function called calesidearea that computes and returns the side area of the square pyramid. Given that the formula uses both the length a and height h of the square pyramid, you must pass these two local variables to this function. You will assign the returned value of this function to side area and then print the value to the terminal. Refer to what was done for calcBaseArea when adding your code. Your other task is to add a new function called prntsprfArea that accepts the base area and side area values (i.e, these are the parameters) and prints out the total surface area of the square pyramid inside this function. Since this function does not return a value to the calling function, the return type of this function should be void Now, modify the above program, referring to the comments included in the code. Complete the requested changes, and then save the file as Lab7A. opp, making sure it compiles and works as expected. Note that you will submit this file to Canvas
Answer:-
CODE:
#include <iostream>
#include<cmath>
using namespace std;
float calcBaseArea(float a);
float calcSideArea(float s,float l);
void prntSprfArea(float base_area,float side_area);
int main()
{
float h;
float a;
float base_area
float side_area;
cout<<"Enter the side length of the base of the square pyramid in feet : ";
cin>>a;
cout<<"Enter the height of the square pyramid in feet : ";
cin>>h;
base_area=calcBaseArea(a);
side_area=calcSideArea(a,h);
cout<<"Base surface area of the square pyramid is "<<base_area<<" square feet. "<<endl;
cout<<"Side area of the square pyramid is "<<side_area<<" square feet."<<endl;
prntSprfArea(base_area,side_area);
return 0;
}
float calcBaseArea(float a)
{
return pow(a,2);
}
float calcSideArea(float s,float l)
{
float area=(s*l)/2;
return 4*area;
}
void prntSprfArea(float base_area,float side_area)
{
cout<<"Total surface area of the pyramid is "<<base_area+side_area<<" square feet.";
OUTPUT:
A recursive method may call other methods, including calling itself. Creating a recursive method can be accomplished in two steps. 1. Write the base case -- Every recursive method must have a case that returns a value or exits from the method without performing a recursive call. That case is called the base case. A programmer may write that part of the method first, and then lest. There may be multiple base cases.Complete the recursive method that returns the exponent of a given number. For e.g. given the number 5 and the exponent 3 (53) the method returns 125. Note: any number to the zero power is 1. Note: Do not code for the example. Your method must work for all given parameters! Use this as your method header: public static int raiseToPower(int base, int exponent)
Answer:
Explanation:
The following code is written in Java. It creates the raiseToPower method that takes in two int parameters. It then uses recursion to calculate the value of the first parameter raised to the power of the second parameter. Three test cases have been provided in the main method of the program and the output can be seen in the attached image below.
class Brainly {
public static void main(String[] args) {
System.out.println("Base 5, Exponent 3: " + raiseToPower(5,3));
System.out.println("Base 2, Exponent 7: " + raiseToPower(2,7));
System.out.println("Base 5, Exponent 9: " + raiseToPower(5,9));
}
public static int raiseToPower(int base, int exponent) {
if (exponent == 0) {
return 1;
} else if (exponent == 1) {
return base;
} else {
return (base * raiseToPower(base, exponent-1));
}
}
}
Batter boards (if properly offset) will allow for the end user to continually re-string the layout to double check accuracy without having to continually set up an instrument True False
Answer:
The given statement is "True".
Explanation:
Batter panels seem to be platform frames that are used to temporarily suspend foundations plan threads. These same batter board members look like barriers once built.Its positioning is important for creating a foundation precisely as the plans state since some components of their development would have to be accurate. Placed correctly batter panels guarantee that the boundaries seem to be at the appropriate temperatures as well as positions.Base conversion. Perform the following conversion (you must have to show the steps to get any credit.
3DF16 = ?
Base to be converted to was not included but we would assume conversion to base 10(decimal)
Answer and Explanation:
The 3DF in base 16 is a hex number so we need to convert to its equivalent binary/base 2 form:
We therefore each digit of given hex number 3DF in base 16 to equivalent binary, 4 digits each.
3 = 0011
D = 1101
F = 1111
We then arrange the binary numbers in order
3DF base 16 = 1111011111 in base 2
We then convert to base 10 =
= 1x2^9+1x2^8+1x2^7+1x2^6+0x2^5+1x2^4+1x2^3+1x2^2+1×2^1+1×2^0
= 991 in base 10
4) a) List two hardware devices that are associated with the Data Link layer. b) Which is the most commonly used in modern Ethernet networks
Answer:
Bridges and switches
Explanation:
4a) A bridge is an intelligent repeater that is aware of the MAC addresses of the nodes on either side of the bridge and can forward packets accordingly.
A switch is an intelligent hub that examines the MAC address of arriving packets in order to determine which port to forward the packet to.
4b) Twisted-pair cable is a type of cabling that is used for telephone communications and most modern Ethernet networks
Consists of forging the return address on an email so that the message appears to come from someone other than the actual sender:_____.
A. Malicious code.
B. Hoaxes.
C. Spoofing.
D. Sniffer.
Answer:
C. Spoofing.
Explanation:
Cyber security can be defined as preventive practice of protecting computers, software programs, electronic devices, networks, servers and data from potential theft, attack, damage, or unauthorized access by using a body of technology, frameworks, processes and network engineers.
Some examples of cyber attacks are phishing, zero-day exploits, denial of service, man in the middle, cryptojacking, malware, SQL injection, spoofing etc.
Spoofing can be defined as a type of cyber attack which typically involves the deceptive creation of packets from an unknown or false source (IP address), as though it is from a known and trusted source. Thus, spoofing is mainly used for the impersonation of computer systems on a network.
Basically, the computer of an attacker or a hacker assumes false internet address during a spoofing attack so as to gain an unauthorized access to a network.
Which attack form either exploits a software flaw or floods a system with traffic in order to prevent legitimate activities or transactions from occurring?
Answer:
Denial of service attack.
Explanation:
In Cybersecurity, vulnerability can be defined as any weakness, flaw or defect found in a software application or network and are exploitable by an attacker or hacker to gain an unauthorized access or privileges to sensitive data in a computer system.
This ultimately implies that, vulnerability in a network avail attackers or any threat agent the opportunity to leverage on the flaws, errors, weaknesses or defects found in order to compromise the security of the network.
Data theft can be defined as a cyber attack which typically involves an unauthorized access to a user's data with the sole intention to use for fraudulent purposes or illegal operations. There are several methods used by cyber criminals or hackers to obtain user data and these includes DDOS attack, SQL injection, man in the middle, phishing, sniffing, DOS attack, etc.
A denial of service (DOS) attack is a form of cyber attack that involves either the exploitation of a software flaw or overwhelmingly floods a computer system in a network with traffic in order to prevent authorized users from performing legitimate activities or transactions.
Some of the ways to prevent vulnerability or cyber attacks in a network are;
1. Ensure you use a very strong password with complexity through the use of alphanumerics.
2. You should use a two-way authentication service.
3. You should use encrypting software applications or services.
