More Networking…

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.

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 Learning

Point

Explain the meaning of the term inter-networking.

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

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.

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.

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

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

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.