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3 years ago

Which of the following lines of code is syntactically correct?

Computers and Technology

1 answer:

natta225 [31]3 years ago

4 0

Answer:

The answer is:

DECLARE

order NUMBER(3);

departure DATE;

BEGIN

---- executable statements ---

END;

Explanation:

SQL Commands must close with a semicolon to be correctly parsed by the server. This is the cause why the syntax is wrong in:

A. DATE; BEGIN ---- executable statements --- END lacks semicolon in END.

B. DECLARE order NUMBER; departure DATE lacks semicolon after DATE.

D. A. DATE; BEGIN ---- executable statements --- END lacks semicolon in END.

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kozerog [31]

I think the Iphone is better the Google Pixels. That's just my opinion but some people like google pixels better.

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3 years ago

Riodic Table

Ksenya-84 [330]

Answer:

riodic Table

A museum wants to store their valuable documents in cases that contain a gas that will protect the documents.

She should not choose one of the other gases because they are too

The museum director should choose

Explanation:

I didn't understand

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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

2 years ago

Write the definitions for three function named max. Each receives two parameters, of the same type, and returns the larger of th

GenaCL600 [577]

Answer:

The method definition to this question can be given as:

Method definition:

double max(double x, double y) //define method with double parameter

{

if (x>=y) //check condition.

return x; //return value

else

return y; //return value

}

double max(int x, int y) //define method with integer parameter

{

if (x>=y) //check condition

return x; //return value

else

return y; //return value

}

double max(char x, char y) //define method with char parameter

{

if (x>=y) //check condition

return x; //return value

else

return y; //return value

}

Explanation:

The above method definition can be described as below:

In the first method definition first, we define a method that is "max()". In this method we pass two variables as a parameter that is "x and y" and the datatype of this is double. Then we use a conditional statement. In the if block we check if variable x is greater then equal to y then it will return x else it will return y.
In the second method definition, we define a method that is same as the first method name but in this method, we pass two integer variable that is "x and y". Then we use a conditional statement. In the if block we check if variable x is greater then equal to y then it will return x else it will return y.
In the third method definition, we define a method that is same as the first and second method name but in this method, we pass two char variable that is "x and y". Then we use a conditional statement. In the if block we check if variable x is greater then equal to y then it will return x else it will return y.

8 0

3 years ago

You decide to use a packet sniffer to identify the type of traffic sent to a router. You run the packet sniffing software on a d

ycow [4]

Answer:

Promiscuous mode

Explanation:

You decide to use a packet sniffer to identify the type of traffic sent to a router. You run the packet sniffing software on a device connected to the same hub that is connected to the router. When you run the software, you only see frames addresse…

✓ Promiscuous mode

7 0

2 years ago