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2 years ago

What infrastructure model provides access to shared computing resources over a network, often the internet?

1 answer:

7 0

Cloud computing infrastructure model provides access to shared computing resources over a network, often the internet. The cloud computing infrastructure is a virtual infrastructure composed of hardware and software components needed to support the computing requirements of a cloud computing model.And the cloud computing model is the delivery of computing services (servers, storage, databases, networking, software, analytics and more) over the Internet .

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When long labels are required, which of these commands can you use to improve readability of a worksheet?

Morgarella [4.7K]

I believe it is wrap text! Hope this helped

6 0

2 years ago

Read 2 more answers

Assume that the reference variable r refers to a serializable object. Write code that serializes the object to the file ObjectDa

laiz [17]

Answer:

FileOutputStream out = new FileOutputStream("ObjectData.dat");

ObjectOutputStream ostream = new ObjectOutputStream(out);

ostream.writeObject(r);

Explanation:

For object serialization, we can use the writeObject method of java.io.ObjectOutputStream class.

The complete code fragment is as follows:

import java.io.*;

class Demo{

public static void main(String args[]){

try{

r = <Reference to Object to be serialized> ;

FileOutputStream out = new FileOutputStream("ObjectData.dat");

ObjectOutputStream ostream = new ObjectOutputStream(out);

ostream.writeObject(r);

ostream.close();

} catch(Exception e){

e.printStackTrace();

}

5 0

2 years ago

Consider the following relation:CAR_SALE(Car#, Date_sold, Salesperson#, Commission%, Discount_amt)Assume that a car may be sold

GalinKa [24]

Answer:

The answer to this question can be given as:

Normalization:

Normalization usually includes the division of a table into two or more tables as well as defining a relation between the table. It is also used to check the quality of the database design. In the normalization, we use three-level that are 1NF, 2NF, 3NF.

First Normal Form (1NF):

In the 1NF each table contains unique data. for example employee id.

Second Normal Form (2NF):

In the 2NF form, every field in a table that is not a determiner of another field's contents must itself be a component of the table's other fields.

Third Normal Form (3NF):

In the 3NF form, no duplication of information is allowed.

Explanation:

The explanation of the question can be given as:

Since all attribute values are single atomic, the given relation CAR_SALE is in 1NF.
Salesperson# → commission% …Given Thus, it is not completely dependent on the primary key {Car#, Salesperson#}. Hence, it is not in 2 NF.

The 2 NF decomposition:

CAR_SALE_1(Car#, Salesperson#, Date_sold, Discount_amt)

CAR_SALE_2(Salesperson#, Commission%)

The relationship in question is not in 3NF because the nature of a transitive dependence occurs
Discount_amt → Date_sold → (Car#, Salesperson#) . Thus, Date_sold is neither the key itself nor the Discount amt sub-set is a prime attribute.

The 3 NF decomposition :

CAR_SALES_1A(Car#, Salesperson#, Date_sold)

CAR_SALES_1B(Date_sold, Discount_amt)

CAR_SALE_3(Salesperson#, Commission%)

5 0

2 years ago

1.Which of the following class definitions defines a legal abstract class?a. class A { abstract void unfinished() { } }b. class

xxMikexx [17]

Answer:(c) abstract class A { abstract void unfinished(); }

Explanation:

A legal abstract class must have the keyword abstract before the class and an abstract class has abstract functions with the keyword abstract written and a void as the return type.

8 0

2 years ago

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

DerKrebs [107]

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.

5 0

2 years ago