| What is a subdivision of a network called? | Subnet |
| Describe how a subnet mask is used to identify the network identifier part of the IP address | Need the IP address of the device
Need the subnet mask
You then logically AND these two together |
| State the how the DHCP system functions | As a device joins a network the DHCP selects an IP addresses from a pool of available addresses
Once a device leaves the network its IP addresses is added back to the pool |
| State the purpose of the DHCP system | Reduce the number of waste private IP addresses |
| Explain the step by step concept of NAT for data sent from a private device to a public device | 1. Initially, at private ip address the source address: its own ip and the destination address: public destination device
2. Gets forwarded to router
3. Router stores its own public ip addresses alongside the private ip address of the source device in a table
4. Then changes the source address to be its own public ip address and sends the information away
5. Public device receives this and sends back data with its own public source address and the destination of the routers public address
6. Arrives at the router and it reads this, using the information stored in the table changes the destination address to be the stored private ip address
7. Data is sent and receives |
| Why is NAT used | Issue of communication between a routable and non routable device |
| What does 'NAT' stand for | Network Address Translation |
| What does 'DHCP' stand for | Dynamic Host Configuration Protocol |
| In terms of communication for NAT, how many ip addresses does a router have and wat are they called | 2
Private and public ip addresses |
