Top 14 DHCP Interview Questions and Answers

DHCP Interview Questions and Answers




Q1: What is DHCP server?

Ans: DHCP stand for Dynamic Host Configuration Protocol. It is network protocol that enable a server to assign automatically IP address range such as subnet, gateway etc. to computer in network. It uses 67 and 68 port number.
Q2: How does it work?

Ans: It works on DORA process.

D denote DHCP Discover

O denote DHCP Offer

R denote DHCP Request

A denote DHCP Acknowledgement






Q3: Which port are used by DHCP?

Ans: 67 and 68

Q4: What is DHCP scope?

Ans: It’s range of possible IP Addresses that DHCP server can lease IP address to client on a subnet.

Q5: What is DHCP Super Scope?

Ans: A super scope is a collection of individual scopes that can be managed as a single administrative unit in network.

Q6: What is reservation in DHCP?

Ans: DHCP reservation feature is used to reserve IP address for providing permanent IP address to client.

Q7: What does default time lease new IP address to client?

Ans: 8 days



Q8: What is command used to release IP address?

Ans: ipconfig /release

Q9: What is command used to renew IP address?

Ans: ipconfig /renew

Q10: What is DHCP relay agent?

Ans: A DHCP relay agent is any host or IP router that forwards DHCP packets between clients and servers.

Q11: How to make client of DHCP server?

Ans: Check mark on Obtain an IP address automatically

Q12: What is APIPA IP address?

Ans: When DHCP server fail or down to assign automatically ip address to client in that case computer automatic assign ip address itself that is APIPA IP address.



Q13: What is the range of APIPA IP address?

Ans: 169.254.0.1 to 169.254.255.255

Q14: Suppose we have a PC which is connected to our corporate network and unable to get ip address and when I am using ipconfig command to check ip address so show 169.254.x.x ip address what is the reason behind it?


Ans: It possible that DHCP down or unable to make connection between server to client.

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