CompTIA Network+ Deploying and
Configuring the DHCP Service
What are the three DHCP allocation methods? - correct answer ✔✔Dynamic
Automatic
Manual
Explain Dynamic Allocation - correct answer ✔✔The DHCP server assigns an IP address to a client
computer from a scope for a specified length of time.
Explain Automatic Allocation - correct answer ✔✔The DHCP server permanently assigns an IP address to
a client computer from a scope.
Explain Manual Allocation - correct answer ✔✔An Administrator permanently assigns an IP address to a
client computer from a scope.
What is another name for Manual Allocation? - correct answer ✔✔A Reservation—In the Windows
Server 2012 DHCP server.
When would you use a Manual Allocation? - correct answer ✔✔For terminals that must have a static IP
address, such as Internet web servers.
DORA - correct answer ✔✔Discover
Offer
Request
Acknowledgement
True or False?
DHCP uses TCP as its transport protocol. - correct answer ✔✔False.
, It uses UDP.
Which port does DHCP use on the SERVER? - correct answer ✔✔67
Which port does DHCP use on the CLIENT? - correct answer ✔✔68
What is the "magic cookie" field used for? - correct answer ✔✔The "options" field in DHCP can contain
many options, which would be impractical to define for each client, so this field informs the server about
what is contained in the rest of the fields.
How is the "magic cookie" designated? - correct answer ✔✔The magic cookie, a 4-byte subfield,
contains the dotted decimal value 99.130.83.99.
What is the DHCP overload option? - correct answer ✔✔This uses a so called "overflow" field that
utilizes the redundant "sname" and or "file" fields if the option packet is over 576 bytes in length.
Because the DHCP message's "sname" and "file" fields are rarely used today, what does the DHCP
standard allow these fields to be used for today? - correct answer ✔✔To contain options that do not fit
in the standard "options" field.
User Datagram Protocol (UDP) datagrams carry DHCP messages that are limited to how many bytes? -
correct answer ✔✔576 bytes
What can test the limit of DHCP messages carried by User Datagram Protocol (UDP) datagrams? - correct
answer ✔✔A large number of options can test this limit.
If a client is in the "init" stage of DHCP negotiation what is its IP configuration? - correct answer ✔✔At
this stage it has no IP address. This is typical of the client as it boots for the first time on the network.
True or False?
When a client issues a DHCPREQUEST, it is trying to lease an IP address. - correct answer ✔✔True
Configuring the DHCP Service
What are the three DHCP allocation methods? - correct answer ✔✔Dynamic
Automatic
Manual
Explain Dynamic Allocation - correct answer ✔✔The DHCP server assigns an IP address to a client
computer from a scope for a specified length of time.
Explain Automatic Allocation - correct answer ✔✔The DHCP server permanently assigns an IP address to
a client computer from a scope.
Explain Manual Allocation - correct answer ✔✔An Administrator permanently assigns an IP address to a
client computer from a scope.
What is another name for Manual Allocation? - correct answer ✔✔A Reservation—In the Windows
Server 2012 DHCP server.
When would you use a Manual Allocation? - correct answer ✔✔For terminals that must have a static IP
address, such as Internet web servers.
DORA - correct answer ✔✔Discover
Offer
Request
Acknowledgement
True or False?
DHCP uses TCP as its transport protocol. - correct answer ✔✔False.
, It uses UDP.
Which port does DHCP use on the SERVER? - correct answer ✔✔67
Which port does DHCP use on the CLIENT? - correct answer ✔✔68
What is the "magic cookie" field used for? - correct answer ✔✔The "options" field in DHCP can contain
many options, which would be impractical to define for each client, so this field informs the server about
what is contained in the rest of the fields.
How is the "magic cookie" designated? - correct answer ✔✔The magic cookie, a 4-byte subfield,
contains the dotted decimal value 99.130.83.99.
What is the DHCP overload option? - correct answer ✔✔This uses a so called "overflow" field that
utilizes the redundant "sname" and or "file" fields if the option packet is over 576 bytes in length.
Because the DHCP message's "sname" and "file" fields are rarely used today, what does the DHCP
standard allow these fields to be used for today? - correct answer ✔✔To contain options that do not fit
in the standard "options" field.
User Datagram Protocol (UDP) datagrams carry DHCP messages that are limited to how many bytes? -
correct answer ✔✔576 bytes
What can test the limit of DHCP messages carried by User Datagram Protocol (UDP) datagrams? - correct
answer ✔✔A large number of options can test this limit.
If a client is in the "init" stage of DHCP negotiation what is its IP configuration? - correct answer ✔✔At
this stage it has no IP address. This is typical of the client as it boots for the first time on the network.
True or False?
When a client issues a DHCPREQUEST, it is trying to lease an IP address. - correct answer ✔✔True
