L3 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 Explain the meaning of the term inter-
Learning networking.
Point

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.

L3 more networking

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