Term
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Definition
Domain Name System
Or
Domain Name Service
Used Interchangably |
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Term
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Definition
| It's a network service that translates 'names' into IP addresses |
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Term
| Give 2 different types of names with examples. |
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Definition
1. Domain names, e.g. Yahoo, .org, Google, .com
2. Host names, eg. FamilyPC, Print-1, Web-1. i.e. computer name (could be a server, printer, etc.) |
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Term
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Definition
Items on the network - eg. servers, routers, printers, etc. Basically any device on the network. All have thier own:
1. Host Name
2. IP Address |
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Term
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Definition
12 diget number, divided into 4 parts:
e.g. 216.199.215.122
Identifies the host. |
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Term
| What is the TCP/IP protocol? |
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Definition
TCP: Transmission Control Protocol
- Establish and maintain an error free connection between two hosts
IP: Internet Protocol
- Data packets (IP address - one host packages it's request and sends to the other host which unpacks it and can send it back again)
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Term
| What windows terminal command can you use ot look at the IP configuration of the host? |
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Definition
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Term
| What does ipconfig/all bring up in windows terminal? Name 3 key pieces of information |
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Definition
Host name
IP address
DNS Servers |
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Term
| When a host on your network wants to connect to another server on the internet. E.g. google's web server to download a web page - where does it send the initial request? |
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Definition
| To one of the DNS servers listed when you use the ipconfig/all command. The DNS Server then goes to look up the IP address of the target server and returns the info to the host. |
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Term
| If you have the IP address of a webserver and type it directly into your browser, what happens? |
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Definition
| You go to the same page as if you had typed in the name - only faster! There is no look up required. |
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Term
| What role does an Internet Service Provider, e.g. Telstra, Singtel, M1 play in getting you connected? |
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Definition
| They allocate you an IP address and give you access to DNS Servers |
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Term
| If we can use names and IP addresses interchangably, why do we need names? |
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Definition
Simply for usability: names mean something to people.
Allows you to assign a name that immediately tells the meaning to anyone looking at the computer. |
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Term
| What command in windows terminal can you use to ask the DNS server for an IP address given a particular host name? |
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Definition
| Ping hostname. Can also be used with IP address to find the connection timing. |
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Term
| Who invented the first lookup table? |
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Definition
Peggy Carp developed the host lookup table as a notepad file (1971-2).
When a new computer was added - everyone's host file needed to be updated. Same when an IP address got updated.
By '73 the host lookup table was used by everyone on the internet. But it would got too big as people were getting added! |
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Term
| When was the 1st DNS system in place? |
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Definition
| 1985 - 100's of 1000's of comupters using IP addresses at that time. |
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Term
| Where can you find a host look up table in windows that allows you to customise your own host names that are resolved as a priority over the DNS server? |
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Definition
C:\Windows\System32\drivers\etc
Open the text file named 'hosts'
You can make certain names resolve to known IP addresses.
This can be a problem for phishing, e.g. I can make your computer resolve www.citibank.com.au to my IP address instead of Citibank's and mimic your website. |
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