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3 years ago

What is a variable?

1 answer:

5 0

Answer. D: a value that looks loads when the program runs.

Explanation:

In programming, a variable is a value that can change, depending on conditions or on information passed to the program. Typically, a program consists of instruction s that tell the computer what to do and data that the program uses when it is running.

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Should charter schools allow cell phone use in class?

lawyer [7]

Answer:

yes

Explanation:

4 0

3 years ago

Read 2 more answers

Write a SELECT statement that joins the Categories table to the Products table and returns these columns: category_name, product

Sphinxa [80]

Answer & Explanation:

1) Query:

SELECT Product_Name, Category_Name, List_Price

FROM Products AS P JOIN Categories AS C

ON C.Category_ID = P.Category_ID

ORDER BY Category_Name, Product_Name ASC;

2) Query:

SELECT C.Last_Name, C.First_Name, Order_Date, P.Product_Name, Item_Price, Discount_Amount, Quantity

FROM Customers AS C JOIN Orders AS O

ON C.Customer_ID = O.Customer_ID

JOIN Order_Items AS OI

ON O.Order_ID = OI.Order_ID

JOIN Products AS P

ON OI.Product_ID = P.Product_ID

ORDER BY Last_Name, Order_Date, Product_Name;

3) Query:

SELECT Category_Name, Product_ID

FROM Categories LEFT JOIN Products

ON Categories.Category_ID = Products.Category_ID

WHERE Product_ID IS NULL;

4) Query:

SELECT 'SHIPPED' AS Ship_Status, Order_Id, Order_Date

FROM Orders

WHERE Ship_Date IS NOT NULL

UNION

SELECT 'NOT SHIPPED' AS Ship_Status, Order_ID, Order_Date

FROM Orders

WHERE Ship_Date IS NULL

ORDER BY Order_Date;

3 0

3 years ago

In a block of addresses we know the IP address of one host is Roll no. Roll no. Roll no. Roll no./20.What is the first address a

lesya [120]

Answer:

If there’s one topic that trips people up (both new and experienced) in the networking industry, it is that of Subnetting.

One of the reasons this happens is that one has to perform (mental) calculations in decimal and also binary. Another reason is that many people have not had enough practice with subnetting.

In this article, we will discuss what Subnetting is, why it came about, its usefulness, and how to do subnetting the proper way. To make this article as practical as possible, we will go through many examples.

Note: While subnetting applies to both IPv4 and IPv6, this article will only focus on IPv4. The same concepts explained here can be applied to IPv6. Moreover, subnetting in IPv6 is more of a want rather than a necessity because of the large address space.

IP address network

For example, any traffic with a destination IP address of 192.168.1.101 will be delivered to PC1, while traffic addressed to 192.168.1.250 will be delivered to SERVER.

Note: This is an oversimplification of things just for understanding sake and refers to Unicast (one-to-one) IPv4 addresses. Traffic sent to Multicast (one-to-many) and Broadcast (one-to-all) IP addresses can be delivered to multiple devices. Also, features like Network Address Translation (NAT) allow one IP address to be shared by multiple devices.

To help your understanding of IP addresses and subnetting, you need to resolve the following fact in your head: Computers think in binary, that is, 0s and 1s. Therefore, even though we see an IP address represented like 192.168.1.250, it is actually just a string of bits – 32 bits in total for IPv4 addresses.

To make them more readable for humans, IPv4 addresses are represented in dotted decimal notation where the 32 bits are divided into 4 blocks of 8 bits (also known as an octet), and each block is converted to a decimal number.

For example, 01110100 in binary is 116 in decimal:

A unicast IPv4 address such as 192.168.1.250 can be divided into two parts: Network portion and Host ID. So what does this mean? Well, IPv4 addresses were originally designed based on classes: Class A to Class E. Multicast addresses are assigned from the Class D range while Class E is reserved for experimental use, leaving us with Class A to C:

Class A: Uses the first 8 bits for the Network portion leaving 24 bits for host IDs. The leftmost bit is set to “0”.

Class B: Uses the first 16 bits for the Network portion leaving 16 bits for host IDs. The two leftmost bits are set to “10”.

Class C: Uses the first 24 bits for the Network portion leaving 8 bits for host IDs. The three leftmost bits are set to “110”.

Note: The range of Class A is actually 1-126 because 0.x.x.x and 127.x.x.x are reserved.

With these classes, a computer/device can look at the first three bits of any IP address and determine what class it belongs to. For example, the 192.168.1.250 IP address clearly falls into the Class C range.

Looking at the Host ID portion of the classes, we can determine how many hosts (or number of individual IP addresses) a network in each class will support. For example, a Class C network will ideally support up to 256 host IDs i.e. from 00000000 (decimal 0) to 11111111 (decimal 255). However, two of these addresses cannot be assigned to hosts because the first (all 0s) represents the network address while the last (all 1s) represents the broadcast address. This leaves us with 254 host IDs. A simple formula to calculate the number of hosts supported

Explanation: Final answer is Start address: 192.168.58.0 + 1 = 192.168.58.1

End address: 192.168.58.16 – 2 = 192.168.58.14

Broadcast address: 192.168.58.16 – 1 = 192.168.58.15

7 0

3 years ago

A computer can manipulate symbols as if it understands the symbols and is reasoning with them, but in fact it is just following

Law Incorporation [45]

Answer:

The symbols may or may not have meaning, but the machine does not need to know how the symbols are interpreted in order to manipulate the symbols in the right way.

Explanation:

The computer can change the symbols in the case when the computer understand but in actual following the cut-paste rules without having any understanding this is because the symbols might be have meaning or not but if we talk about the machine so actually they dont know how the symbols are interpreted and how it can be used so that it can be change in the accurate way

5 0

3 years ago

When keying, keep fingers curved and upright over the home keys.<br> False<br> True

Dmitry [639]

Answer:

This is true.

Explanation:

I think everyone was taught to to type correctly sometime in school or at home. It helps you proficiently type. But most people don't use the Home Room Key Technique. Most use the "Chicken peck"

3 0

3 years ago