05 - DNS, IP addressing

 1. What is a 'protocol'?

  A group of cables

  A group of teachers

  A set of networks

  A set of rules

 2. To make a website available to the general public, what things in the list below would be useful to have in place?
Requirements to create a website and make it available to the public
1. ISP 
2. Unique URL for each website and page 
3. IP address for the device where the website is being hosted 
4.A DNS to look up the URL and find the correct IP address 
5. Somewhere to host the website 
6. Cloud services to provide alternative services.

  1,2,3 and 6

  Just 1, 2 and 5

  None of the items in the list

  All of the items in the list are valid

 3. ISP stands for "Internet Service Provider" - What is an ISP?

  A company that fixes the internet for the government

  A piece of software installed on every machine that connects to the internet

  A company that provides access to the internet for businesses and individuals

  A piece of hardware that is attached to each computer that then connects to the internet

 4. What does URL stand for?

  Uniform Resource Locator

  Universal Reversal Lindicator

  United Retail Loplock

  Universal RAM Lock

 5. What is a URL?

  None of the above

  It is a software package that directs users to the internet

  It is the unique web address for every webpage on the internet.

  It is a physical address at which websites are stored

 6. Every single device connected to the internet has it's own unique address (a bit like your home address). What is this?

  IP Address

  Software Map Address

  MAC Address

  Physical Address

 7. IP is short for Internet Protocol. An internet protocol is a set of rules that govern the activity on the internet and the WWW



 8. An IP addres is made up of a set of four numbers, each of which contains one to three digits, and is seperated by a dot.



 9. An IP address might look something like this:



 10. Each part of the IP address is presented as a denary number ranging from 0 to 255 - unlike a MAC address which is presented in ____

  Hex format

  No format

  String format

  Text format

 11. IP address numbers may not look terribly impressive but they are the key to….

  locating internet users

  send and receive data over the internet

  providing security to all customers

  firewalling the internet

 12. IP Addresses can be either:

  real or unreal

  physical or conceptual

  static or dynamic

  logical or hardwired

 13. Static addresses are temporary and can change



 14. Dynamic IP addresses are temporary and are assigned to the device every time it accesses the internet
Note: if you are using a dynamic IP address then your device will have a different IP address every time it joins  a network to access the internet



 15. Websites are hosted on Servers. A server is simply…

  A computer! Usually a powerful one

  A piece of powerful software

  A large router

  A satellite dish that serves data

 16. If you were searching for a specific website (e.g. how would you know the IP address to find the server on which the site was stored?
For example -do you know theIP address of youtube or facebook? 

  You would ring your country's government

  You would guess

  That's where the DNS comes in (Domain Name System)

  You would look it up in a large telephone directory and need to find it in order to visit the site

 17. The Domain Name System (DNS) translates web addresses into the correct IP address for the server or service that you requested.
It means that you don't need to remember every IP address for every site on the internet!



 18. DNS servers have a database of IP addresses and they are constantly updated by other DNS servers



 19. An advantage of DNS is that you have to remember the IP addresses for all websites, ensuring you have a good memory



 20. If you are not connected to a DNS server you will not be able to access any website for which there is a stored IP address



 21. Are these valid as the first two steps of how the DNS works?
1. Type in the name of the website (e.g. 2. Your browser makes contact with a DNS server. The server contains a database that matches the domain name up  with its registered IP address. 



 22. In the following web page URL, http is the protocol and is the ??

  the requested web page located in the protocol

  domain name stored on a DNS

  the requested folder that is in the ISP

  All of the above are valid options

 23. Name servers are used to:
DNS is the main system over the internet that uses the name server. If you set 
up your own website and use hosting, you will come across both DNS and 
name servers when you are setting up your domain name. 

  name each website on the internet with an ASCII code

  host the name of the company that has created the site

  provide each URL or website on the internet with a unique set of hexadecimal numbers

  host and match website addresses to IP addresses

 24. Every website has a URL with ?.

  a name server attached to its protocol

  a unique protocol starting with 'www'

  an equivalent IP address

  a unique ASCII code

 25. A DNS is an internet service that translates alphabetic names into IP addresses