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What is DHCP? What are the benefits and drawbacks of using it?
DHCP is Dynamic Host Configuration Protocol. In a networked environment it is a
method to assign an 'address' to a computer when it boots up.
Benefit: A system administrator need not worry about computers being able to access
networked resources
Benefits of using DHCP
DHCP provides the following benefits for administering your TCP/IP-based network:
Safe and reliable configuration
DHCP avoids configuration errors caused by the need to manually type in values at
each computer. Also, DHCP helps prevent address conflicts caused by a previously
assigned IP address being reused to configure a new computer on the network.
Reduces configuration management
Using DHCP servers can greatly decrease time spent configuring and reconfiguring
computers on your network. Servers can be configured to supply a full range of
additional configuration values when assigning address leases. These values are
assigned using DHCP options. Also, the DHCP lease renewal process helps assure
that where client configurations need to be updated often (such as users with mobile
or portable computers who change locations frequently), these changes can be
made efficiently and automatically by clients communicating directly with DHCP servers.

Describe the steps taken by the client and DHCP server in order to obtain an
IP address. ?
DHCP uses a client-server model. The network administrator establishes one or
more DHCP servers that maintain TCP/IP configuration information and provide it
to clients. The server database includes the following:
Valid configuration parameters for all clients on the network.
Valid IP addresses maintained in a pool for assignment to clients, plus reserved
addresses for manual assignment.
Duration of a lease offered by the server. The lease defines the length of time for
which the assigned IP address can be used.
With a DHCP server installed and configured on your network, DHCP-enabled
clients can obtain their IP address and related configuration parameters
dynamically each time they start and join your network. DHCP servers
provide this configuration in the form of an addresslease offer to requesting clients.

What is the DHCPNACK and when do I get one? Name 2 scenarios.?
What does DHCPNACK stand for?
DHCP (Dynamic Host Configuration Protocol) Negative Acknowledgment

What ports are used by DHCP and the DHCP clients?
Requests are on UDP port 68, Server replies on UDP 67

For Question & Answer on DHCP and Its process etc.  click here

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