1. Networking Objectives Recap and understand the following network addressing terms – IP address – MAC address – Packet – protocol

2. Networking IP address Every computer has a unique IP address. This allows computers to direct packets of data to the correct PC’s. IP address is split into 4 sets of numbers ranging from 0 to 255. A example IP address would be – 192.168.6.3 You can find out the IP address of the computer your currently working on by running “getNetworkInfo” program!” A IP address can be changed by a network administrator or could be set by an ISP. (internet service provider)

3. Networking MAC address A MAC address is a hardware address and can not be changed. It is set up when the network device is created. It is made up of 6 sets of 2 hex values. Eg 8a-91-BF-1C-8A-FC MAC addresses are used by network devices, such as a switch, to route packets correctly. MAC addresses are not changeable which means that it is a more accurate way of identifying a PC. It is very common for security mechanism in networks to use MAC addresses rather than IP addresses. For example our wireless network has a list of allowed MAC addresses. All other devices are blocked. So even if you got the password you would still not be able to access the network on your own laptop!

4. Networking Activity Open the program “getNetworkInfo” and note down your IP address. Build a list of all of the students in the group and their IP addresses and MAC addresses. Are the addresses random or do they share any similarities. Hint – have a think about how you are going to do this. Working in a team will make this task easier!

5. Networking Activity Make notes on – What is a MAC address? What is the difference between a IP and MAC address?

6. Networking Packets This video will help you remember what a packet is! Warriors of the net

7. Networking Activity Check you have notes on the following – IP address MAC address LAN / WAN Packet Hub Switch Router NIC card

8. Networking Protocols A protocol is a set of rules which govern the communication between two devices. In order for computers to understand each other they must speak the same language. Exactly the same as humans! In networking this means they must choose the same protocol.

9. Networking Using the same protocol Packet A protocol must be selected by each PC. When a packet is created the protocol will add some information to the packet. This is known as a header. TCPUDP TCP

10. Networking Using the same protocol Packet If the destination PC is using a different protocol then it will not understand the packet! TCP UDP TCP

11. Networking Using the same protocol Packet In order for packets to be understood the same protocol must be used. In this case both PC’s are using “TCP”. TCP

12. Networking Protocol note! There are many different protocols in use. You do not need to know what they do!

13. Networking Activity Make notes on – What is a protocol?