L3 more networking
- 2. Learning Outcomes • Explain the meaning of the term inter- networking. • Define routers, bridges and gateways and consider where and why they are used. • Consider how a subnet mask is used to identify the network identifier part of an IP address. • Distinguish between routable and non- routable IP addresses.
- 3. Inter-Networking • Internetworking is formed when computers from one network communicate with computers from other networks. • These networks communicate via gateways • An example of inter-networking is the internet, which has now become important and widely used in everyday life Key Explain the meaning of the term inter- Learning networking. Point
- 4. Routers • Routers and Bridges allow communication between computers on different segments • A Router is a device that receives packets from a router or a host and uses the destination IP address the packets contain to pass them to another router or host
- 5. Bridges • A bridge holds a table of addresses for each connected machine. • Data packets received from one segment are only forwarded if they have a valid destination address on the other segment. • This helps to reduce overall traffic.
- 6. Gateways • A device used to connect networks using different protocols so that information can be passed from one system to another • Gateways are used to connect LANs through the internet • In order to do this, they must translate the LANs frame into equivalent WAN frame, vice versa. This is because the LANs uses a protocol that is different from the protocols used on the internet which is WAN.
- 7. IP Address • The subnet mask is used by the TCP/IP protocol to determine whether a host is on the local subnet or on a remote network. • Which class are these addresses? a) 10.52.165.23 b) 192.168.17.3 c) 150.266.193.1 d) 1.1.1.1 e) 128.255.243.19
- 8. Routable vs. Non-Routable • A routable IP address is one that can be reached (or routed) by anyone on the internet. • A non routable IP address means internet people can't reach you (reserved by the business) – class A reserved space 10.0.0.0/8 – class B reserved space 172.16.0.0/12 – class C reserved space 192.168.0.0/16
- 9. Your Task • Using the iPad you need to make a video to show your understanding of the learning outcomes. • Once finished sync to DropBox. – Explain the meaning of the term inter-networking. – Define routers, bridges and gateways and consider where and why they are used. – Consider how a subnet mask is used to identify the network identifier part of an IP address. – Distinguish between routable and non-routable IP addresses.