Packet Tracer – Implement DHCPv4 (Answers Version)

Answers Note: Red font color or gray highlights indicate text that appears in the instructor copy only.

Addressing Table

Objectives

Part 1: Configure a Router as a DHCP Server

Part 2: Configure DHCP Relay

Part 3: Configure a Router as a DHCP Client

Scenario

As the network technician for your company, you are tasked with configuring a Cisco router as a DHCP server to provide dynamic allocation of addresses to clients on the network. You are also required to configure the edge router as a DHCP client so that it receives an IP address from the ISP network. Since the server is centralized, you will need to configure the two LAN routers to relay DHCP traffic between the LANs and the router that is serving as the DHCP server.

Instructions

Part 1:  Configure a Router as a DHCP Server

Step 1:  Configure the excluded IPv4 addresses.

Configure R2 to exclude the first 10 addresses from the R1 and R3 LANs. All other addresses should be available in the DHCP address pool.

Step 2:  Create a DHCP pool on R2 for the R1 LAN.

1. Create a DHCP pool named R1-LAN. The pool name must match this value in order for you to get credit for your configuration.
2. Configure the DHCP pool to include the network address, the default gateway, and the IP address of the DNS server.

Step 3:  Create a DHCP pool on R2 for the R3 LAN.

1. Create a DHCP pool named R3-LAN (case-sensitive).
2. Configure the DHCP pool to include the network address, the default gateway, and the IP address of the DNS server.

Part 2:  Configure DHCP Relay

Step 1:  Configure R1 and R3 as a DHCP relay agent.

Step 2:  Set PC1 and PC2 to receive IP addressing information from DHCP.

Part 3:  Configure R2 as a DHCP Client

Step 1:  Configure the Gigabit Ethernet 0/1 interface on R2 to receive IP addressing from DHCP.

Step 2:  Activate the interface.

End of document

Answer Scripts

Router R1

enable

conf t

interface GigabitEthernet0/0

 ip helper-address 10.1.1.2

end

Router R2

enable

conf t

ip dhcp excluded-address 192.168.10.1 192.168.10.10

ip dhcp excluded-address 192.168.30.1 192.168.30.10

ip dhcp pool R1-LAN

 network 192.168.10.0 255.255.255.0

 default-router 192.168.10.1

 dns-server 192.168.20.254

ip dhcp pool R3-LAN

 network 192.168.30.0 255.255.255.0

 default-router 192.168.30.1

 dns-server 192.168.20.254

interface GigabitEthernet0/1

 ip address dhcp

end

Router R3

enable

conf t

interface GigabitEthernet0/0

 ip helper-address 10.2.2.2

end