DHCP SERVER INTERVIEW QUESTIOTON
1) What is DHCP?
o
DHCP stands for "Dynamic Host Configuration
Protocol". DHCP allows for dynamic allocation of network addresses and
configurations newly attached hosts.
2) Describe how the DHCP lease is obtained.
o
It’s a four-step process consisting of (a) DHCP
Discover, (b) DHCP Offer, © DHCP Request (d) DHCP Acknowledgement.
3) Can a BOOTP client boot from a DHCP server?
o
Only if the DHCP server is specifically written to
also handle BOOTP queries.
4) What is DHCP Scope?
o
Scope - A range of IP addresses that the DHCP
server can assign to clients that are on one subnet.
5) What is Supersocpe?
o
Superscope is a range of IP addresses that span
several subnets. The DHCP server can assign these addresses to clients that are
on several subnets.
6) What is Client Reservation?
o
Client Reservation is used to be sure a computer
gets the same IP address all the time. Therefore since DHCP IP address
assignments use MAC addresses to control assignments.
7) What is Exclusion range?
o
Exclusion range is used to reserve a bank of IP
addresses so computers with static IP addresses, such as servers may use the
assigned addresses in this range. These addresses are not assigned by the DHCP
server.
8) Which utility is used to compact DHCP
Database?
o
JETPACK
9) What is Scope Options?
o
Scope options are IP configuration settings for a
particular subnet including the IP address of the router (default gateway), DNS
Server, Domain Name, WINS Server etc.
10) Why we need DHCP Relay Agent?
o
When you have clients on different Subnets, you
either need to have multiple DHCP Servers, or a DHCP Relay Agent. All DHCP
packets are broadcast packets. When there is a DHCP broadcast the router will
not forward the broadcast packets. To allocate IP address for the clients which
are on a network other than DHCP server, you need to configure DHCP relay agent
on Router. The DHCP Relay Agent allows you to place DHCP Clients and DHCP
Servers on different networks.
o
I can’t seem to access to the corporate network
and on ipconfig my address is 169.254.X.X. What happened?
o
The 169.254.x.x netmask is assigned to Windows
machines running 98/2000/XP if the DHCP server is not available. The name for
the technology is APIPA (Automatic Private Internet Protocol Addressing)
11) We’ve
installed a new Windows-based DHCP server, however, the users
do not seem to be getting DHCP lease for
the Server. Reason out why the lease is not available?
The
server must be authorized first with the Active Directory.
• How can
you force the client to give up the dhcp lease if you have access to the client PC?
o
ipconfig /release
12) What authentication options do Windows 2003
Servers have for remote clients?
o
PAP, SPAP, CHAP, MS-CHAP, MS-CHAP v2 and EAP.
13)What is DHCP ?
DHCP
is used to automatically provide IP address to client computers.
14)Explain DHCP 4 packets.
- Discover = client sends request for IP.
- Offer = DHCP server send and Offer with IP address.
- Request = if clients accepts the IP it sends a request to DHCP.
- Ack = DHCP server sends ack for the same.
15)What is client reservation in DHCP
?
to reserver a specific IP for a specific machine or host.
16)What is WINS ?
It is used to resovle NetBIOS
Computer name to IP address.
17)How
DHCP Works
- DHCP uses a four-phase process to configure a DHCP client as given below
- IP lease discover : When client initializes it broadcasts a request to find the DHCP server to
- get a IP address from available DHCP server.
- IP lease offer : All DHCP servers that have valid IP addressing information available send an
- offer to the client request.
- IP lease request : The client selects the IP addressing information from the first offer it
- receives and broadcasts a message requesting to lease the IP addressing information in the offer.
- IP lease acknowledgment : The DHCP server that made the offer responds to the message,
- and all other DHCP servers withdraw their offers. The IP addressing information is assigned to
- the client and an acknowledgment is sent
18)Ipconfig
Switches/Options
/all : Produces
a detailed configuration report for all interfaces
/flushdns : Removes
all entries from the DNS name cache
/registerdns : The
DNS domain name for client resolutions
/displaydns : Displays
the contents of the DNS resolver cache
/release <adapter> : Releases
the IP address for a specified inter
Ø HCP Relay Agent
- A relay agent is a small program that relays DHCP/BOOTP messages between clients and
- servers on different subnets. The DHCP Relay Agent component provided with the Windows
- 2000 router is a BOOTP relay agent that relays DHCP messages between DHCP clients and
- DHCP servers on different IP networks. For each IP network segment that contains DHCP
- clients, either a DHCP server or a computer acting as a DHCP relay agent is required.
19)To add the DHCP Relay Agent
i. Click Start, point to Programs, point to Administrative Tools, and
then click Routing And
Remote Access.
ii. In the console tree, click Server name - IP Routing - General.
iii. Right-click General, then click New Routing Protocol.
iv. In the Select Routing Protocol dialog box, click DHCP Relay Agent,
then click OK.
20)What is DHCP.
DHCP
is a protocol which is designe for Automatic Give the IP Address to DHCP
client..
DHCP
Assine the IP Address for few days Lease & capture the clients MAC
address..
It is Updated version of BootP…
It is Updated version of BootP…
DHCP
is used for MAC address to IP mapping its support both static and dynamic
mapping.Static mapping are done just like bootstrap and for dynamic mapping it
have database of MAC and IP when a packet with a MAC comes ask for ip its check
that assigne a dynamic IP fixed that for a specific time and then return that
packet with that IP
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