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[description], Story, any other text you want to use. How to understand the Domain Name System by: Clare Lawrence
Ever wonder why DNS systems came into existence? Efficiency. Every computer has a distinct IP address, and the Internet needed an elite method for obtaining these addresses and for managing the system as a whole. Enter ICANN. The Internet Corporation for Assigned Names and Number manages the DNS root of the Internet domain namespace. ICANNs role is to manage the assignment of identifiers, ensuring that all users have unique names. The DNS system is run by a series of servers called DNS servers. ICANN manages the root DNS domains, under which are the top-level domains. It also manages:
Beneath the top-level domains are other naming authorities such as Nominet, the UKs naming authority. How does a DNS Query work? The process occurs in two parts. Firstly, a name query begins at a client computer and is passed to DNS client service for resolution. When the query cannot be resolved locally, DNS servers are queried. For example, when a web browser calls the fully qualified domain name www.discountdomainsuk.com, the request is passed on to the DNS client service to resolve the name by using locally cached information. If the query is held in the cache, then the process is complete. If, however, the query cannot be answered locally, the DNS client service uses a server list (ordered in sequence) to query external DNS servers. When a DNS server receives a query, it first checks to see if it is authoritive for that domain name. If it is authoritive, it resolves the name, and the process is complete. If the DNS server is unable to resolve the query, it in turns queries other DNS servers, using a process known as recursion. DNS servers make use of root hints to assist in locating DNS servers, which are able to provide the required result. In this way, DNS queries are minimised and the Internet is able to operate quickly and effectively. A typical query may run as follows: Client contacts Nameserver A looking for www.discountdomainsuk.com. Nameserver A checks its cache, but cant answer, so it queries a server authoritive for the Internet root. The root server responds with a referral to a server authoritive for the .com domains. NameserverA queries the the .com server and gets referred to the server authoritive for www.discountdomainsuk.com. Nameserver A queries this server and gets the IP address for www.discountdomainsuk.com. Nameserver A replies to the client with the IP address. Queries can return answers that are authoritive, positive, negative or referral in nature. In the event of a negative answer, another DNS server is queried.
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Until recently, people used a technique called symmetric key cryptography to secure information being transmitted across public networks in order to make audio player shopping more secure. This method involves encrypting and decrypting a audio player message using the same key, which must be known to both parties in order to keep it private. The key is passed from one party to the other in a separate transmission, making it vulnerable to being stolen as it is passed along. With public-key cryptography, separate keys are used to encrypt and decrypt a message, so that nothing but the encrypted message needs to be passed along. Each party in a audio player transaction has a *key pair* which consists of two keys with a particular relationship that allows one to encrypt a message that the other can decrypt. One of these keys is made publicly available and the other is a private key. A audio player order encrypted with a person's public key can't be decrypted with that same key, but can be decrypted with the private key that corresponds to it. If you sign a transaction with your bank using your private key, the bank can read it with your corresponding public key and know that only you could have sent it. This is the equivalent of a digital signature. While this takes the risk out of audio player transactions if can be quite fiddly. Our recommended provider listed below makes it all much simpler. Real Time Media On The Net Index
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