DHCP-Further Subnet

Design Subnet Plan

Subnet Adress

Choose the number of subnet bits based on the number of subnet required

EX: For five location the subnet required is 5 this mean 3 host bit must be borrow

Host Address

Choose the number of host bits based on the number of host you required on each subnet

Ex: For subnet with 100 host, seven host bit are required

Supernetting

Use when your network too small

Class C was the easiest to purchase

Combine network must be contiguos

Chosen subnet must be adjacent and must be consolidate within upper boundaries

DHCP

Used

Centralise IP configuration settins

Allow flexibility in IP address management

Cater for "nomadic" user who need to work at numerous branch

How it work

Follow the DORA process refer to note for detail

Renewal

Renew when 50% of the lease has expired

Using unicast process to renew everytime time start up

If fail to renew it will lease after 87.5% expired then use DORA

Scopes

A scope is a container for administrating a pool of address

All address in a Pool must come from the same subnet

A Server can have many Scopes

A Scope can have numerous pools of addresses (rare)

Exclusion

Some devices need to have their IP settings manually configured

These addresses cannot be offered to other devices

Exclusions prevents the DHCP SERVER from offering addresses

Reservation

Ensure a device is allocated the same IP address

Allocation is based on the device's MAC address

Applied

Server

Scope

Reserved Client