Answer:
When discussing the data-modeling building blocks, anything (a person, a place, a thing, or an event) about which data are to be collected and stored is referred to as an entity.
Explanation:
Entities, attributes, and relationships are the basic building blocks of all data models .
An entity is therefore described as anything, such as a person, place, thing, or event, about which data are to be collected and stored. They may be physical objects such as customers or products.
Answer:
To avoid collision of transmitting frames.
Explanation:
CSMA/CA, carrier sense multiple access is a media access control protocol of wireless networks that allows for exclusive transmission of frames and avoidance of collision in the network. When a frame is not being sent, nodes listening for an idle channel gets their chance. It sends a request to send (RTS) message to the access point. If the request is granted, the access point sends a clear to send (CTS) message to the node, then the node can transmit its frame.
Many nodes on a wireless network are listening to transmit frames, when a frame is transmitting, the node has to wait for the access point to finish transmitting, so it sends a RTS message again to exclusively transmit a second frame.
This is not really true, so is this supposed to be like a true or false question? If so then I would say this is false, because a lot of smaller people post on blogs it is not all typically large companies or organizations.
Answer is CPU cache
Explanation: A CPU cache is a special high-speed memory which is smaller and faster, and which helps to store copies of data from main memory location which are often used. It is actually located quite close to the processing core, and is used by the CPU of a computer to save time and energy in accessing data from the main memory.
The way it works is if the processor is either trying to read from or write to a particular location in the main memory, it checks to see if the data from the location is already in a cache, if it is, then it alternatively read from or write to the cache; which faster, instead of the main memory.
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