Networking : Subnets COMP3. IP Addressing Within a Network Each node within a network must be uniquely identified Identification makes use of an IP address.

Networking : SubnetsCOMP3

IP Addressing Within a Network

• Each node within a network must be uniquely identified

• Identification makes use of an IP address

• Within networks, an IP may be dynamic or static.

• Task 1:• Write down the advantages and disadvantages of dynamically

assigning an IP address.

You Are Here

Understanding IP Addressing

• Computers work with binary – hence the use of numbers for quick translation.

• For non-technical humans, this is not so easy.

• Task 2:• Open an internet browser and navigate to: http://cisco.com

• Open a second browser and navigate to: http://72.163.4.161

• What was the result?

DNS

• DNS stands for : Domain Name Server

• This is the text version of the IP address which is assigned to the particular web server to which you want to connect to.

Task 3: using your own machines run a cmd window.

Run a ping command to a website of your choosing.

Understanding IP Addressing

• IP addresses are built as a hierarchy

• They can be understood much like a combining a house number with a UK Postcode

BN6 2JR 72

Town Area House

Understanding IP Addressing

• IP addresses are built as a hierarchy

• They can be understood much like a combining a house number with a UK Postcode

72.163.4.161

Network (aka. Subnet)

Host(aka. Node)

A Net Mask

• Networks are set up in ‘Bands’ which range from small to large businesses.

• The smaller the network, the larger the number of nodes that may be assigned.

• How many possible nodes could this network hold?

255.255.255.x

Network (aka. Subnet)

Host(aka. Node)

Historical Subnets

• Class A - values 0 through 127

• Class B - values 128 through 191

• Class C - values 192 through 223

• Class D - (multicast) - values 224 through 239

• Class E - (experimental) - values 240 through 255

255.255.x.xTask 4 : What class of network is this?

Current Subnets

• Current subnets include an additional byte signifying how many bits the subnet includes. These addresses are formed in this way:

192.168.0.1/24Task 5 : Write down the subnet for this IP address

Final task• Assign an appropriate IP to each of the nodes in these two offices:

Network:192.168.1.0/24

Network:192.168.2.0/24

Homework• Complete questions 1 – 3 on page 181 of text book.

• Create a network diagram using photos of the individual pieces of hardware.

• DUE 26th September!!!