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36 Cards in this Set
- Front
- Back
Each time that a DHCP client starts, it requests an _ _ from a _ _.
|
IP address
DHCP server |
|
When the DHCP server receives the request, it selects an _ _ from a range of _ defined in its database.
|
IP address
addresses |
|
The DHCP server _ this address to the DHCP client.
|
offers
|
|
If the client accepts the offer, the DHCP server leases the IP address to the client for a specified _ _ _
|
period of time.
|
|
The default duration of an IP address lease is _ _.
|
eight days
|
|
DHCP uses a four-step process to lease IP addressing information to DCHP clients:
IP lease _ IP lease _ IP lease _ IP lease _ |
request
offer selection acknowledgement |
|
The lease generation process begins when a client computer either _ _ or _ _ for the first time.
|
starts up
initializes TCP/IP |
|
The lease process also begins when a client computer attempts to renew its lease and is _ (such as when a client computer is moved to another _).
|
denied
subnet |
|
the client initializes a _ version of TCP/IP and broadcasts a _ message for IP addressing information.
|
limited
DHCPDISCOVER |
|
The client does not yet have an IP address, so it uses _ as the source address.
|
0.0.0.0
|
|
because the client does not know the IP address of a DHCP server, it uses _ as the destination address.
|
255.255.255.255
|
|
The request message also contains the _ address
|
media access control (MAC)
|
|
The message also contains the client's _ _ so that DHCP servers can determine which _ sent the request.
|
computer name
client |
|
All DHCP servers that have an IP address that is _ for the network segment to which the client is connected respond with a _ message
|
valid
DHCPOFFER |
|
The DHCPOFFER message contains:
1) The client's _ _ 2) An _ IP address 3) A subnet _ 4) The _ of the _ 5) A _ _, which is the IP address of the offering DHCP server |
hardware address
offered mask length lease server identifier |
|
The DHCP client waits _ _ for an offer. If it does not receive an offer, it rebroadcasts the request four times at _ _ _ and _ second intervals, plus a random length of time between 0 and _ milliseconds.
|
one second
2-, 4-, 8-, and 16- 1,000 |
|
If the client does not receive an offer after _ requests, it uses an IP address in the reserved range from _ to 169.254._._
|
_
169.254.0.1 255.254 |
|
The DHCP client continues in an attempt to find a DHCP server every _ minutes.
|
five
|
|
The DHCP client responds to the first offer that it receives by broadcasting a _ message to accept the offer.
|
DHCPREQUEST
|
|
The DHCPREQUEST message includes the _ _ of the server whose offer it accepted.
|
server identification
|
|
All other DHCP servers then _ _ _
|
retract their offers
|
|
The DHCP server issuing the accepted offer broadcasts a _ _ message _ to acknowledge the successful lease.
|
DHCP acknowledgement
(DHCPACK) |
|
When the DHCP client receives the acknowledgment, TCP/IP _ by using the _ _ that the DHCP server provides.
|
initializes
configuration information |
|
A DHCP client automatically attempts to renew its lease when _ _ of the lease duration expires.
|
50 percent
|
|
To attempt a lease renewal, the DHCP client sends a _ _ _ to the DHCP server from which it obtained the lease.
|
DHCPREQUEST message directly
|
|
If the DHCP server is available, it _ the lease and sends the client a _ message with the new _ _
|
renews
DHCPACK lease duration |
|
If the DHCP server is unavailable, the client continues to use its _ _ _.
|
current configuration parameters.
|
|
If a DHCP client cannot renew its lease at the percent interval, the client continues to use its current configuration parameters. It then broadcasts a _ message to update its address lease when _ percent of the current lease duration expires.
|
50
DHCPDISCOVER 87.5 |
|
If a client requests an invalid or duplicate address for the network, a DHCP server can respond with a _ _ _ _.
|
DHCP denial message (DHCPNAK).
|
|
When the server responds with a DHCPNAK, This forces the client to _ _ _ _ and obtain a new, valid address.
|
release its IP address
|
|
All communication between a DHCP server and a DHCP client occurs using _ ports _ and _
|
UDP
67 68 |
|
If the lease expires, the client must immediately _ its use of the current IP address. The DHCP client then begins the _ _ _ in an attempt to lease a new IP address
|
discontinue
DHCP lease process |
|
When you restart a DCHP client, it _ _ to _ the IP address lease that it had when it _ _
|
automatically attempts
renew shut down |
|
If the lease request is _, the client attempts to contact the _ _ _. If the _ _ responds and lease time is still available, the DHCP client uses the same _ _ until its next lease _ _.
|
unsuccessful
configured default gateway default gateway IP address renewal attempt |
|
If the DHCP client cannot renew the lease or contact the _ _, it stops using the _ _ _.
|
default gateway
current IP address |
|
The client then uses an IP address in the reserved range from _ to _ and tries to contact a DHCP server every _ minutes
|
169.254.0.1
169.254.255.254 five |