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NT1330 Unit 1 Assignment 1: Questions And Answers

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Human beings can easily remember names much better than they can remember a string of numbers. DNS is a system primarily design to make computers easy to use for humans, names are used instead of IP addresses when computers make connections to other computers. IP addresses are 32 bit numbers that uniquely identifies every host on an IP network, however a new standard for 128 bit IP addresses has recently been adopted (Lowe, 2011).When the hospital url www.whnt.nhs .uk is typed into a web browser, a process called name resolution occurs. Shapiro, 2008 defined name resolution as the mapping of a name to an IP address. The hospital web site will be located on a web server within the hospital network. Web …show more content…
It will send a query to its nearest DNS server which is the DNS server located in my ISP network asking for the ip address of www.whnt.nhs.uk. The ISP DNS server will send recursive queries on my computer’s behalf starting with the root name server as illustrated in Fig. 1. The Root Name Server will then refer the ISP DNS server to the .uk name server which is nsa.nic.uk in Exhibit 1. The ISP DNS server will send a query to the .uk Name server and the .uk name server will refer the ISP DNS server to nhs.uk name server which is nsa.nhs.uk in Exhibit 1. A query is send again by my ISP DNS server this time to .nhs.uk server and response with a reference to the whnt.nhs.uk is send back my ISP DNS server. The ISP DNS will then send a query to whnt.nhs.uk. The whnt.nhs.uk will send the name to ip address information for www whnt.nhs.uk since zone database file with name to ip mapping information of www.whnt.nhs.uk. The information is passed on to my computer and a connection with the web server is made. The information will be cached in my ISP DNS for further

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