Answer:
DNS translates domain names and hostnames into IP addresses through a basic lookup function. When a user requests a domain name (as in the case of a browser lookup) the computer queries the local DNS server to find the matching IP address. If the local DNS server does not contain the information in it's local database, it contacts the next higher DNS system or the root domain DNS servers (i.e. microsoft.com - if the local system does not know it, it will query the well-known DNS server for the .com domain - which will know where to get the information).
DNS helps the users by not requiring them to remember the IP address of every system them want to connect with. microsoft.com is much easier to remember than 40.82.167.220.
DNS also helps the internet scale through the use of load balancing. Multiple systems can comprise a single web site with the web pages stored on many different machines with multiple IP addresses. When a user requests the microsoft.com website IP, they are given the primary IP of the load balancer sitting in front of the multiple computers. The load balancer will then distribute the traffic to any of the systems that are hosting the web page that are not busy. To the end user it look like they are connecting to a single machine - when in fact they are connecting to one of potentially hundreds of web servers with the same content. As traffic grows on the internet more servers are necessary to handle the additional traffic. DNS helps ensure the end user will connect to the proper web server regardless of the number of web server copies spun up in response to the additional traffic. This allows the capacity to scale as necessary without interruption to the web site.
Explanation:
Answer:
Charge back.
Explanation:
A chargeback is a charge that is returned to a payment card after a customer successfully disputes an item on their account transactions report. Simply put, it is the reversal of a credit card payment that comes directly from the bank.
Most commonly the payer is a consumer.
A chargeback may occur on bank accounts or credit cards. They can be granted to a cardholder for a variety of reasons. A chargeback can be considered a refund since it returns specified funds taken from an account through a prior purchase. Chargebacks are focused on charges that have been fully processed and settled. Chargebacks can often take several days for full settlement as they must be reversed through an electronic process involving multiple entities.
The chargeback is ordered by the bank that issued the consumer's payment card.
Answer:
Sir William Crookes invented the cathode ray tube in 1878, but these discoveries took many years to merge into the common ground of television. His mechanical system used a scanning disk with small holes to pick up image fragments and imprint them on a light-sensitive selenium tube. A receiver reassembled the picture.
Answer:
A
Explanation:
Cryptography is the study of secure communications techniques that allow only the sender and intended recipient of a message to view its contents. ... When transmitting electronic data, the most common use of cryptography is to encrypt and decrypt email and other plain-text messages.
Answer:
a medical journal/study from a licenced doctor on a website with .org
Explanation:
most medical journals from licenced doctors have .org in the end and are trusted
