Lesson 3: Dynamic Host Configuration Protocol (DHCP)

Working Group of the Internet Engineering Task Force

DHCP was created by the Dynamic Host Configuration ________________________

standard-track protocol

October 1993: RFC 1531 initially defined DHCP as a ______________________ succeeding the Bootstrap Protocol (BOOTP), which is a network protocol used by a network client to obtain an IP address from a configuration server

Internet Protocol version 4 (IPv4)

October 1997: RFC 2131 released is the current DHCP definition for ______________________ networks

extensions of DHCP for IPv6 (DHCPv6)

The _________________ were published as RFC 3315

Dynamic Host Configuration Protocol

a method for assigning Internet Protocol (IP) addresses permanently or to individual computers in an organization's network

Dynamic Host Configuration Protocol

lets a network administrator supervise and distribute IP addresses from a central point and automatically sends a new IP address when a computer is plugged into a different place in the network

Configuration parameters for network hosts

IP address

Router

Subnet Mask

Others..

Static

Two types of IP addresses:

Is a number that is assigned to a computer by an Internet service provider (ISP) to be its permanent address on the Internet

Dynamic

Two types of IP addresses:

The temporary IP address

machine

Why is DHCP Important?

Important when it comes to adding a ___________ to a network

When computer requests an address, the administrator would have to manually configure the machine

Why is DHCP Important?

Mistakes are easily made

Causes difficulty for both administrator as well as neighbors on the network

manually adding

Why is DHCP Important?

DHCP solves all the hassle of _________________ a machine to a network

request

How does DHCP work?

When a client needs to start up TCP/IP operations, it broadcasts a _____________ for address information

same address

How does DHCP work?

The DHCP server will not reallocate the address during the lease period and will attempt to return the ________ every time the client requests an address

extend its lease or send a message

How does DHCP work?

The client can ___________ to the server before the lease expires it that it no longer needs the address so it can be released and assigned to another client on the network

administrative

Advantages of DHCP

DHCP minimizes the __________ burden

conflict IP address

Advantages of DHCP

By using DHCP there is no chance to ____________

another network

Advantages of DHCP

By using DHCP relay agent you provide IP address to _____________

enterprises network

Disadvantages of DHCP

When DHCP server is unavailable, client is unable to access ________________

machine name

Disadvantages of DHCP

Your ____________ does not change when you get a new IP address

unauthenticated

Security problem

DHCP is an ____________ protocol

credentials

Security problem

When connecting to a network, the user is not required to provide ____________ in order to obtain a lease

requesting many leases

Security problem

Malicious users with physical access to the DHCP enabled network can instigate a denial-of-service attack on DHCP servers by ____________ from the server, thereby depleting the number of leases that are available to other DHCP clients

administer

Easy to set-up and administer

DHCP servers are easy to ____________ and can be set-up in just a few minutes

automatically

Easy to set-up and administer

Client addresses are assigned __________

fixed addresses

Limitations

Some machines on your network need to be at ______________, for example servers and routers

assign a machine

Limitations

You need to be able to ____________ to run the DHCP server continually as it must be available at all times when clients need IP access

same range

If you intend to set up your client computers manually, make sure that the assigned IP address is in the __________ of your default router address and that it is unique to your private network