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69 Cards in this Set
- Front
- Back
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What does the DORA process stand for? |
Discover, Offer, Request, Acknowledge |
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What does the "Discover" step in DORA consist of? |
The DHCP client sends out a DHCPDISCOVER broadcast message |
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What does the "Offer" step in DORA consist of? |
all available DHCP servers receiving a DHCPDISCOVER broadcast respond with an DHCPOFFER message with an available IP address |
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What does the "Request" step in DORA consist of? |
a DHCP client choosing an IP address offered by a DHCPOFFER message and responding with a DHCPREQUEST message |
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What does the "Acknowledge" step of DORA consist of? |
the DHCP server sending a DHCPACK message to confirm a client's lease |
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What happens if the DHCP server receives a DHCPREQUEST message but finds the IP address is already in use? |
it sends a DHCPNAK message and the client begins the DORA process again |
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What happens if the DHCP client receives a DHCPOFFER message but finds the IP address is already in use? |
it responds with a DHCPDECLINE message and begins again |
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When does a DHCP client begin trying to renew its lease? |
When 50% of the lease period is half over |
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What message does a DHCP client send when trying to renew its lease at 50% of the lease period? |
a T1 message |
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What is a T1 message used for? |
attempting to renew a DHCP lease at 50% of the lease period |
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How does a DHCP server respond to a T1 message if the lease information is still valid? |
with a DHCPACK message and resets lease |
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What does a DHCP client do if the T1 message to renew its lease does not work?
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Waits until 87.5% of lease period has passed, then sends a T2 message |
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What is a T2 message used for? |
Requesting a DHCP lease renewal at 87.5% of lease period |
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Who can respond to a T2 message? |
Any DHCP server |
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What restriction does DHCP have on multi-segment networks? |
Broadcasts aren't routable, so there needs to either be a DHCP server on each segment or BOOTP messages need to be forwarded |
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What tool can be used to get around the fact that DHCP broadcasts aren't routable? |
a DHCP relay agent |
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What is a DHCP class? |
a group of computers needing identical DHCP options |
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What command is used to add a computer to a DHCP class? |
IPConfig /setclassid |
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What is a scope? |
A contiguous set of IP addresses with the same options set |
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What is a superscope? |
A grouping of multiple scopes |
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What does authorizing a DHCP server do? |
adds the IP address of the server, scope, etc. to the AD object containing the list of all authorized servers, scopes, etc. |
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What does the Delay value on a scope indicate? |
How long the server will wait before sending a DHCPOFFER message |
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What is the default DHCP lease? |
8 days |
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What does DHCP option 003 specify? |
Router (default gateway) |
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What DHCP option sets the default gateway? |
003 Router |
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What does DHCP option 006 specify? |
DNS servers |
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What DHCP option specifies DNS servers? |
006 |
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What does DHCP option 015 specify? |
Default DNS domain name |
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What DHCP option specifies the default DNS domain name? |
015 |
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What does DHCP option 028 specify? |
The broadcast address for the segment |
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What DHCP option specifies the broadcast address for the segment? |
028 |
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What does DHCP option 044 specify? |
WINS/NBNS servers |
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What DHCP option specifies the available WINS and NBNS servers? |
044 |
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What does DHCP option 046 specify? |
The WINS/NBT node type |
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What DHCP option specifies the WINS/NBT node type? |
046 |
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What are the four WINS/NBT node types? |
B Node (0x1): NetBIOS broadcast; M Node (0x4): Mixed mode (B node, then N node); H Node (0x8): Hybrid mode (N node, then B node) |
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What does DHCP option 051 specify?
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Lease (special lease duration) |
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What DHCP option specifies a special lease duration? |
051 |
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What are the 3 types of IPv6 addresses? |
Unicast, multicast and anycast |
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What is the prefix of an IPv6 site-local address? |
FEC0::/48 |
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What type of IPv6 address uses a prefix of FEC0::/48?
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a site-local address |
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What is the prefix of an IPv6 link-local address? |
FE80::/64 |
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What type of IPv6 address uses a prefix of FE80::/64? |
a link-local address |
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What prefix does an IPv6 multicast address use? |
FF00::/80 |
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What type of IPv6 address uses a prefix of FF00::/80? |
a multicast address |
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How does an anycast address work? |
a single client sends a message which is picked up by the first available appropriate responder |
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How is a 6to4 address calculated? |
by adding the global prefix 2002::/16 with the 32 bits of a public IP address |
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What are the 2 lease types for IPV6 addresses? |
Non-Temporary Addresses (IANA) and Temporary Addresses (IATA) |
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How does changing lease properties on a scope affect existing leases? |
When the lease expires the clients will need to begin DORA process again |
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What does Network Access Protection do? |
restricts access to DHCP to clients that meet specified health requirements |
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What extra piece of information is required to configure a DHCP reservation? |
the client's MAC address
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What happens when settings conflict at the server and scope levels? |
The more specific options take effect |
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What predefined user class can be used to assign a shorter lease to VPN users? |
Default and Remote Access Users |
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How many superscopes can be configured? |
1 per DHCP server |
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What system does MADCAP manage? |
IPv4 multicasting |
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What system handles IPv4 multicasting? |
MADCAP |
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What IP class does MADCAP use? |
IPv4 Class D |
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What is the Class D address range? |
224.0.0.0 - 239.255.255.255 |
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Where is the local DHCP database located? |
%systemroot%\system32\DHCP\dhcp.mdb |
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What is dhcp.tmp? |
a temporary backup copy of dhcp.mdb |
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When is dhcp.tmp seen? |
When the DHCP service fails during re-indexing |
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What does the J50.log file do? |
Stores changes that need to be written to the DHCP database |
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What file stores changes that need to be written to the DHCP database? |
J50.log |
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What does the J50.chk file do? |
serves as a checkpoint to tell the DHCP engine which files need to be recovered |
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What file serves as a checkpoint to tell the DHCP engine which files need to be recovered? |
J50.chk |
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What may be indicated if the lease information in the DHCP console doesn't match what's seen on the network? |
a corrupt DHCP database |
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What are the 4 steps to fix a corrupted DHCP database? |
net stop dhcpserver; |
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What command is used to compact JET databases? |
jetpack.exe |
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What does jetpack.exe do? |
compacts JET databases like DHCP |
