7.4.1 Packet Tracer – Implement DHCPv4 – Instructions Answer

7.4.1 Packet Tracer – Implement DHCPv4 (Instructor Version)

7.4.1 Packet Tracer – Implement DHCPv4 – Instructions Answer 1

7.4.1 Packet Tracer – Implement DHCPv4

Addressing Table

Device Interface IPv4 Address Subnet Mask Default Gateway
R1 G0/0 192.168.10.1 255.255.255.0 N/A
S0/0/0 10.1.1.1 255.255.255.252
R2 G0/0 192.168.20.1 255.255.255.0 N/A
G0/1 DHCP Assigned DHCP Assigned
S0/0/0 10.1.1.2 255.255.255.252
S0/0/1 10.2.2.2 255.255.255.252
R3 G0/0 192.168.30.1 255.255.255.0 N/A
S0/0/1 10.2.2.1 255.255.255.0
PC1 NIC DHCP Assigned DHCP Assigned DHCP Assigned
PC2 NIC DHCP Assigned DHCP Assigned DHCP Assigned
DNS Server NIC 192.168.20.254 255.255.255.0 192.168.20.1

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.

R2(config)#ip dhcp excluded-address 192.168.10.1 192.168.10.10
R2(config)#ip dhcp excluded-address 192.168.30.1 192.168.30.10
Step 2: Create a DHCP pool on R2 for the R1 LAN.

a. Create a DHCP pool named R1-LAN. The pool name must match this value in order for you to get credit for your configuration.

b. Configure the DHCP pool to include the network address, the default gateway, and the IP address of the DNS server.

R2(config)#ip dhcp pool R1-LAN
R2(dhcp-config)#network 192.168.10.0 255.255.255.0
R2(dhcp-config)#default-router 192.168.10.1
R2(dhcp-config)#dns-server 192.168.20.254
Step 3: Create a DHCP pool on R2 for the R3 LAN.

a. Create a DHCP pool named R3-LAN (case-sensitive).

b. Configure the DHCP pool to include the network address, the default gateway, and the IP address of the DNS server.

R2(config)#ip dhcp pool R3-LAN
R2(dhcp-config)#network 192.168.30.0 255.255.255.0
R2(dhcp-config)#default-router 192.168.30.1
R2(dhcp-config)#dns-server 192.168.20.254

Part 2: Configure DHCP Relay

Step 1: Configure R1 and R3 as a DHCP relay agent.
R1(config)#interface g0/0
R1(config-if)#ip helper-address 10.1.1.2
R3(config)#interface g0/0
R3(config-if)#ip helper-address 10.2.2.2
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.
R2(config)#interface g0/1
R2(config-if)#ip address dhcp
R2(config-if)#no shutdown

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
 no shutdown
end

Router R3

enable
conf t
interface GigabitEthernet0/0
 ip helper-address 10.2.2.2
end

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