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4 years ago

What name is used to denote a common field that exists between two tables, but is also the primary key for one of the tables??"

Computers and Technology

1 answer:

Diano4ka-milaya [45]4 years ago

4 0

Answer:

b. foreign key

Explanation:

In the database world, a foreign key is a field on one table and a primary key for another table. The purpose of a foreign key is to provide linkages between two or more tables. Given two tables A and B, and making A the point of reference, a primary key is a field that is unique in A while a foreign key is unique in B.

On another hand, a composite primary key is a combination of two or more fields/columns on database table that can be used to uniquely identify each row in the table.

In the database lingua, what we have is a unique key not a distinct key, though the two words are similar in meaning.

A duplicate key is used when an information may be repeatedly entered on a table.

So the correct option is a foreign key.

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2 years ago

"Explain the functionality of the different layers found in the network protocol stack of an operating system such as Linux"

arsen [322]

Answer:

There are 7 layers in linux.

Explanation:

As networking is difficult and complex.

Imagine if every application had to know how to communicate on every step that would be more than just complex. So, rather than reinvent something which will help it to communicate let’s just make something that will automatically controls the communication and for that protocols came in to live.

As for the linux operating system, it is not exceptional from other operating systems.

There are 7 layers on network protocol stack use to communicate with other network protocol stack.

1. Application layer

2. System call interface

3. Protocol agnostic interface

4. Network protocol

5. Device agnostic interface

6. Device drivers

7. Physical hardware

All the layers vary in their functionality.

One more important thing to remember is that the network protocol stack layers is not one way its 2 way communication. First, when a client request to a network and second, when the request is full filled.

The top most layer is a part of user space, the next five layers comes in the kernel space and the final layer is the physical layer.

Application layer:

When a client or user request to a network the request initially comes to this layer.

On this layer we use tcp/ip protocol.

System call interface(SCI):

When application layer make a call to the kernel this layer handles that call. And take the request to the next layer.

Protocol agnostic interface:

This layer has two functions “talking” or “listening”. There is a thing called sockets which perform these functions and each socket has an id which is used specifically for an application.

Network protocol:

This layer is used for how the data is sent or received.

Device agnostic interface:

It is used to connect data from/to kernel user space and the network device drivers which allows the data to prepare itself for transmission over the medium from the network device.

Physical hardware :

This layer is responsible for the data packets transmission and received from the network medium being used whether cable or wireless.

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4 years ago

Which is NOT something that a game producer needs to do?

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Answer:

Plan the script, characters, and how the game is played

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3 years ago

When you are saving a file, what does word suggest by default as the name of the document?

LenaWriter [7]

Whatever you have written on the page is what it'll name it.

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3 years ago

Read 2 more answers

Lena is completing her senior year of college and is living in an apartment with three friends. Her family has a subscription to

vladimir1956 [14]

Answer:

d) consumer misbehavior

Explanation:

This is an example of consumer misbehavior. What Lena is doing is not technically piracy or illegal because HBO has created the family feature on their accounts for the account to be used by multiple people at the same time. Yet, the feature was not intended to be used by individuals that are not technically family or even under the same roof. Therefore, what Lena is doing goes against HBO's reason for this feature and sharing the account as Lena is doing is ultimately hurting HBO's streaming service.

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3 years ago