Dhcp Interview Questions And Answers (dynamic Host Configuration Protocol) _ Networker Interview.pdf

7/26/2016

DHCP Interview Questions and Answers (Dynamic Host Configuration Protocol) | Networker Interview

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DHCP Interview Questions and Answers (Dynamic Host Configuration Protocol)

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What is DHCP? Dynamic Host Conⲇﾘguration Protocol (DHCP) assigns IP addresses to hosts dynamically. It allows easier administration and works well in small as well as very large network environments. All types of hardware can be used as a DHCP server including a Cisco router.

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What information a DHCP server can provide to a host? DHCP server can provide following information IP address Subnet mask Default gateway Domain Name Server

            

WINS information How DHCP Works? DHCP works on DORA Process (DISCOVER - OFFER - REQUEST - ACKNOWLEDGEMENT). 1.When a Client needs an IP conⲇﾘguration, it tries to locate a DHCP server by sending a broadcast called a

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DHCP DISCOVER. This message will have a Destination IP of 255.255.255.255 and Destination MAC of ⟓祓:⟓祓:⟓祓:⟓祓:⟓祓:⟓祓.

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[Source IP - 0.0.0.0 , Destination IP - 255.255.255.255, Source Mac - Mac address of Host, Destination Mac FF:FF:FF:FF:FF:FF]

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———————————————— 2.On Receiving DHCP Discover, Server sends a DHCP OFFER message to the client. The DHCPOFFER is a

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proposed conⲇﾘguration that may include IP address, DNS server address, and lease time. This message will be unicast and have the destination mac address of DHCP client's mac address. The source mac address will be that of the DHCP server.

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[S.Mac - Mac address of Server , D.Mac - Mac address of Host] ———————————————— 3.If the Client ⲇﾘnds the O⟓祓er agreeable, it sends DHCP REQUEST Message requesting those particular IP parameters. This message will be a Broadcast message. [Source Mac - Mac address of Host, Destination Mac - FF:FF:FF:FF:FF:FF] ———————————————— 4.The Server on receiving the DHCP REQUEST makes the conⲇﾘguration o㈔缲cial by sending a unicast DHCP ACK acknowledgment. [Source Mac - Mac address of Server, Destination Mac - Mac address of Host] What is the reason for getting APIPA address? With APIPA, DHCP clients can automatically self-conⲇﾘgure an IP address and subnetmask when a DHCP server is not available. When DHCP client boots up, it ⲇﾘrst looks for a DHCP server in order to obtain an IP address and subnet mask. A client uses the self-conⲇﾘgured IP address until a DHCP server becomes available. The APIPA service also checks regularly for the presence of a DHCP server. If it detects a DHCP server on the network, APIPA stops

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7/26/2016

DHCP Interview Questions and Answers (Dynamic Host Configuration Protocol) | Networker Interview

and the DHCP server replaces the APIPA networking addresses with dynamically assigned addresses. What is the range of APIPA address? The IP address range is 169.254.0.1 through 169.254.255.254. The client also conⲇﾘgures itself with a default Class B subnet mask of 255.255.0.0. What is the purpose of relay agent? A DHCP relay agent is any host that forwards DHCP packets between clients and servers if server is not on the same physical subnet. Relay agents are used to forward requests and replies between clients and servers when they are not on the same physical subnet. DHCP relay agent can be conⲇﾘgured using the ip helper-address command.

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What is DHCP decline message? It is Sent by Client to server indicating network address is already in use (already assigned to another device). What is DHCPNAK message? If the Server is unable to satisfy the DHCPREQUEST message (The requested network address has been allocated) the Server Should sent DHCPNAK message to client. It can also be Sent if client's notion of network address is incorrect (Client has moved to new subnet) or client's lease expired.

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  DHCP.

  Cisco dhcp relay agent apipa dhcpnak dhcp decline dora dhcp discover dhcp o⟓祓er

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