DHCP (Dynamic Host Configuration Protocol)

DHCP (Dynamic Host Configuration Protocol)

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  DHCP P R ES E N TAT I O N GROUP 7
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  FAISAL S U PE R I O R C O L L E G E L A H O R E BS(IT)
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  Contents • What isDHCP • How it works • How does DHCP process work? • Allocation • Advantages & Disadvantages
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  What is DHCP DHCP(Dynamic Host Configuration Protocol) is a network management protocol used to dynamically assign an Internet Protocol (IP) address to any device, or node, on a network so they can communicate using IP. DHCP automates and centrally manages these configurations rather than requiring network administrators to manually assign IP addresses to all network devices. DHCP can be implemented on small local networks as well as large enterprise networks.
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  How it works ADHCP server is used to issue unique IP addresses and automatically configure other network information. In most homes and small businesses, the router acts as the DHCP server. In large networks, a single computer might act as the DHCP server. In short, the process goes like this: A device (the client) requests an IP address from a router (the host), after which the host assigns an available IP address to allow the client to communicate on the network.
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  HOW DOES DHCPPROCESS WORK? DHCP operation divides into 4 phases. • Server Discovery • IP Lease Offer • IP Lease Request • IP lease Acknowledgement
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  Processes
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  Allocation How DHCP Operates 1)Manual Allocation: The administrator manually assigns a pre-allocated IP address to the client and DHCP only communicates the IP address to the device. 2) Automatic Allocation: DHCP automatically assigns a static IP address permanently to a device, selecting it from a pool of available addresses. There is no lease and the address is permanently assigned to a device. 3) Dynamic Allocation: DHCP automatically dynamically assigns, or leases, an IP address from a pool of addresses for a limited period of time chosen by the server, or the address will be withdrawn when the client tells the DHCP server that it no longer needs the address.
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  Advantages & Disadvantages Advantages Reduceaddress wastage Preserve address Provide basic firewall features Hides internal from outside Disadvantages  No direct end-to-end connectivity  Port forwarding setup  Some application will not work  Complexity