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oee [108]
2 years ago
9

In step 4 of the CSMA/CA protocol, a station that successfully transmits a frame begins the CSMA/CA protocol for a second frame

at step 2, rather than at step 1. What rationale might the designers of CSMA/CA have had in mind by having such a station not transmit the second frame immediately (if the channel is sensed idle?
Computers and Technology
1 answer:
DerKrebs [107]2 years ago
5 0

Answer:

There could be a collision if a hidden node problem occurs.

Explanation:

CSMA/CA(carrier sense multiple access/ collision avoidance) is a multiple access method in wireless networking, that allows multiple node to transmit. Collision avoidance of this method is based on preventing signal loss or downtime as a result of collision of transmitting multi signals.

If a node at step 4(transmit frame) sends the first frame, the node still needs to send a RTS(request to send) and to receive a Clear to send (CTS) from the WAP, the is to mitigate the issue of hidden node problem as all frame are treated as unit, so other listening nodes, not detected would seek to connect and transmit as well.

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4.17 LAB: Data File A comma separated value (.csv) file has been included to be used for this program. Each line contains two va
Andrej [43]

Answer:

import csv

def Csvreader(filename):

   with open("filename", "r") as file:

   content = file.csv_reader()

   list_content = list(content)

   file.close

   return list_content

Explanation:

This is a python description of the function that reads the csv file and converts it to a list, from the list, each item can accessed with its index and updated directly. Use this to draw the same conclusion for a java program.

7 0
2 years ago
Assume there is a class AirConditioner that supports the following behaviors: turning the air conditioner on and off. The follow
Dafna11 [192]

Answer:

1)

officeAC = new AirConditioner();

officeAC.turnOn();

2)

officeAC = new AirConditioner();

officeAC.turnOn();

officeAC.setTemp(69);  

Explanation:

1)

In the first statement a new object of the class AirConditioner whose reference is assigned to the officeAC. new is a keyword which creates an object of the class.

Next statement uses the method turnOn(). Reference to the new object officeAC is used to invoke this method turnOn().

2) The first two statements works the same as in 1)

The last statement invokes a method setTemp() using the reference variable and passes the value 69 to this method to set the desired temperature.

6 0
2 years ago
When a CPU executes instructions as it converts input into output, it does so with
yuradex [85]
The power of science of course
8 0
2 years ago
To explain acceptable computer use to their employees, students, or other users, many organizations and educational institutions
docker41 [41]

Answer:

Codes of conduct

Explanation:

Codes of conduct are a set of rules or norms established by an organization for all employees, students or users, to ensure individual responsibilities and proper practices. The code of conduct can cover overall behaviour of individuals in an organization, but a specific code of conduct can be developed for proper computer use in order to establish what is appropriate and available to use in the organization´s computers, and also to restrict or avoid non related content.

7 0
1 year ago
Read 2 more answers
Write a while loop that prints user_num divided by 2 until user_num is less than 1. The value of user_num changes inside of the
WITCHER [35]

Answer:

The code to this question can be defined as follows:

Code:

#include <stdio.h> //defining header file

int main() //defining main method

{

float user_num; //defining float variable

printf("Enter a value: "); //message

scanf("%f",&user_num); //input value from user end

printf("%f, ",user_num); //print value

while (user_num>1) //loop to calculte value

{

user_num=user_num/2; //diving value

printf("%f, ",user_num); //print value.

}

   return 0;

}

Output:

Enter a value: 20

20.000000, 10.000000, 5.000000, 2.500000, 1.250000, 0.625000,  

Explanation:

Description of the code as follows:

  • First, a float variable "user_num" is declared, in which we take input from the user-end.
  • In the next step, a while loop is declared, that uses the above variable to calculates its value.
  • Inside the loop variable "user_num" divide its value by 2 and holds its calculated value, to print its value the "printf" method is used that prints its value.  
8 0
2 years ago
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