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2 years ago

Is bit stuffing necessary in the control or address field in theHDLC protocol? why?

Computers and Technology

1 answer:

steposvetlana [31]2 years ago

7 0

Answer:

Many network and communication protocols require bit stuffing for the following purposes: to avoid the interpretation of data as control information. For example, with six consecutive 1 bits, X.25 uses the bit stuffing,signal the beginning and end of a frame.

High-level Data link control (HDLC) is a bit-oriented protocol for point-to-point and multi-point communication.P/F bits are present in HDLC control field.

So,Yes bit stuffing is necessary in control field.

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Nosql is a great technology for storing well-structured data. <br> a. True <br> b. False

mash [69]

I'd say False

NoSQL or the non-rational databases are document oriented and distributed. Unlike the SQL or the relational databases which are structured, NoSQL deals with a huge amount of unstructured data and offer greater flexibility. NoSQL are more like file folders, gathering related information of all types.

3 0

2 years ago

Suppose that you are asked to modify the Stack class to add a new operation max() that returns the current maximum of the stack

Advocard [28]

Answer:

Following are the code to the given points:

Explanation:

For point 8.1:

public String max()//defining a method max

{

String maxVal=null;//defining a string variable that holds a value

for(int x=0;x<n;x++)

{

if(maxVal==null || a[i].compareTo(maxVal)>0)//defining if blok to comare the value

{

maxVal=a[i];//holding value in maxVal variable

}

return maxVal;//return maxVal variable value

}

For point 8.2:

public void push(String item)//defining a method push that accepts item value in a parameter

{

a[n]=item;//defining an array to hold item value

if(n==0 || item.compareTo(maxVals[n-1])>0)//use if to comare item value

{

maxVals[n]=item;//holding item value in maxVals variable

}

else

{

maxVals[n]=maxVals[n-1];//decreasing the maxVals value

}

n++;//incrementing n value

}

public String pop()//defining a method pop

{

return a[--n];//use return value

}

public String max()//defining a method max

{

return maxVals[n-1];//return max value

}

In the first point, the max method is declared that compares the string and returns its max value.
In the second point, the push, pop, and max method are declared that works with their respective names like insert, remove and find max and after that, they return its value.

7 0

2 years ago

5) Write a regular expression would zip code + 4 fields of the forms: xxxxx-xxxx where x is any number but the last 4 digits cou

marusya05 [52]

Answer:

Following is the expression written in "Bash script" (mixture of commands):

^\d{5}(?:[-\s]\d{4})?$

Explanation:

^ = For staring string (denotation).
\d{5} = Matching 5 digits (first five unknown x's)
(?:…) = Making Group (making group of former 5 digits)
[-\s] = Match a hyphen or a space

(checking if a hyphen is present?)

\d{4} = Matching 4 digits (next four unknown x's)
…? = Pattern before it is optional
$ = Ending of the string.(denotation)

4 0

2 years ago

The Fast as Light Shipping company charges the following rates. Weight of the item being sent Rate per 100 Miles shipped 2kg or

Pie

Answer:

weight = float(input("Enter the weight of the package: "))

distance = float(input("Enter the distance to be sent: "))

weight_charge = 0

if weight <= 2:

weight_charge = 0.25

elif 2 < weight <= 10:

weight_charge = 0.3

elif 10 < weight <= 20:

weight_charge = 0.45

elif 20 < weight <= 50:

weight_charge = 1.75

if int(distance / 100) == distance / 100:

d = int(distance / 100)

else:

d = int(distance / 100) + 1

total_charge = d * weight_charge

print("The charge is $", total_charge)

Explanation:

*The code is in Python.

Ask the user to enter the weight and distance

Check the weight to calculate the weight_cost for 100 miles. If it is smaller than or equal to 2, set the weight_charge as 0.25. If it is greater than 2 and smaller than or equal to 10, set the weight_charge as 0.3. If it is greater than 10 and smaller than or equal to 20, set the weight_charge as 0.45. If it is greater than 20 and smaller than or equal to 50, set the weight_charge as 1.75

Since those charges are per 100 miles, you need to consider the distance to find the total_charge. If the int(distance / 100) is equal to (distance / 100), you set the d as int(distance / 100). Otherwise, you set the d as int(distance / 100) + 1. For example, if the distance is 400 miles, you need to multiply the weight_charge by 4, int(400/100) = 4. However, if the distance is 410, you get the int(400/100) = 4, and then add 1 to the d for the extra 10 miles.

Calculate the total_charge, multiply d by weight_charge

Print the total_charge

3 0

2 years ago

What is a curson?

sp2606 [1]

Answer:

C. Blinking vertical line on your screen

Explanation:

A cursor is tha blinking vertical line on your screen.

5 0

3 years ago