DHCP Interview Questions & Answers

1.What is DHCP?
Dynamic Host Configuration Protocol: assigns IPs to the clients requested dynamically or automatically.

2.Process of DHCP (DORA)?
Discover: The Client discovers DHCP
Offers: The DHCP server offers a group of IPs to the clients to pick any
Request:The client selects an IP and request DHCP to confirm it
Acknowledgement: The DHCP server makes a confirmation by sending an DHCPPACK to the client.

3.What is a Scope?
Range of IP Addresses.

4.What is an IP Lease?
DHCP server clients an IP to the client for a period of 8 days. This offer is called IP Lease.

5.What is the default duration of a lease?
8 Days.

6.What is authentication DHCP server?
Enabling AD Know the availability of DHCP server Useful when we have multiple DHCP Server and you want to you designate one particular DHCP server to be active. Then we should authorize.

7.What is IP Reservation?
Resolving a particular dynamic IP for a particularly system.

8.What is exclusion?
Omitting assigning from the range selected IPs.

9.What is a SUPER SCOPE?
Group of scopes is called as super scope.

10.Purpose of DHCP Relay agent?
DHCP server is available on another N/W and you want another N/W to obtain IPs from the DHCP server. Then the DHCP, RA can forward the request from the clients to the DHCP server to obtain IPs for the clients it acts like a mediator between clients and DHCP.

11.How to given an IP obtained from DHCP?
Start>Run>CMD>IPConfig/Release.

12.How to obtain a new IP from DHCP server?
Start>run>CMD>IPConfig/renew.

13.Switching used with IPCONFIG?
IPCONFIG/ all, Release/ Renew/ FLUSHDNS

14.If the client is unable to contact DCHP server, what happens?
Obtains an IP from APIPA

15.What is APIPA?
Automatic Private IP Addressing, when client machines unable to contact DHCP then APIPA assign an IP to the client. This enables the N/W Availability.

16.What are the IP ranges provided by APIPA?
169.254.0.0 to 169.254.255.255

17.What is WINS?
Windows Internet Naming Services: - useful in windows N/W only. Resolves NETBIOS names to IP addresses and IPs to NetBIOS names