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15 Cards in this Set

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What is DHCP?
Dynamic Host Configuration Protocol
What is DHCP's purpose?
DHCP's purpose is to enable individual computers on an IP network to extract their configurations from a server.
(IP address/gateway)
What is an IP address?
It is a number that uniquely identifies a computer that is making use of the Internet
Why shouldn't clients assign IP numbers without the use of a server?
1. A computer that needs a permanently-assigned IP number might be turned off and lose its number to a machine coming up. This has problems both for finding services and for security.
What protocol and port does DHCP use?
DHCP, like BOOTP runs over UDP, utilizing ports 67 and 68
What is a MAC address?
A number which uniquely identifes a computer that has an Ethernet interface. (In DHCP's typical use, the server uses a requesting computer's MAC address to uniquely identify it.)
What is a DHCP lease?
A DHCP lease is the amount of time that the DHCP server grants to the DHCP client permission to use a particular IP address. A typical server allows its administrator to set the lease time.
What is a Client ID?
Whatever is used by the protocol to identify the client computer. (ussually the MAC address, but can be a character string if setup as so)
Can DHCP support statically defined addresses?
Yes. At least there is nothing in the protocol to preclude this and one expects it to be a feature of any DHCP server. This is really a server matter and the client should work either way. The RFC refers to this as manual allocation.

Who Created It?
The Dynamic Host Configuration Working Group of the Internet Engineering Task Force
How does DHCP and BOOTP handle multiple subnets?
A feature of some routers known as "BOOTP forwarding" to forward DHCP or BOOTP requests to a server on another subnet and to forward the replies back to the client.
In a subnetted environment, how does the DHCP server discover what subnet a request has come from?
DHCP client messages are sent to off-net servers by DHCP relay agents, which are often a part of an IP router. The DHCP relay agent records the subnet from which the message was received in the DHCP message header for use by the DHCP server.

Can a DHCP client boot from a BOOTP server?
Only if the DHCP client were specifically written to make use of the answer from a BOOTP server. It would presumably treat a BOOTP reply as an unending lease on the IP address.

Can a DHCP server back up another DHCP server?
You can have two or more servers handing out leases for different addresses. If each has a dynamic pool accessible to the same clients, then even if one server is down, one of those clients can lease an address from the other server.

Can a BOOTP client boot from a DHCP server?
Only if the DHCP server is specifically written to also handle BOOTP queries.