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Dokumente/NWT/4BHITN-DHCP-LAB-7.4.2.md

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Lab - Implement DHCPv4

Task

Addressing Table

Device Interface IP Address Subnet Mask Default Gateway
R1 G0/0/0 10.0.0.1 255.255.255.252 N/A
R1 G0/0/1 N/A N/A N/A
R1 G0/0/1.100 192.168.1.1 255.255.255.192 N/A
R1 G0/0/1.200 192.168.1.65 255.255.255.224 N/A
R1 G0/0/1.1000 N/A N/A N/A
R2 G0/0/0 10.0.0.2 255.255.255.252 N/A
R2 G0/0/1 192.168.1.97 255.255.255.240 N/A
S1 VLAN 200 192.168.1.66 255.255.255.224 192.168.1.65
S2 VLAN 1 192.168.1.98 255.255.255.240 192.168.1.97
PC-A NIC DHCP DHCP DHCP
PC-B NIC DHCP DHCP DHCP

VLAN Table

VLAN Name Interfaces Assigned
1 N/A S2: (F0/18)
100 Clients S1: F0/6
200 Management S1: VLAN 200
999 Parking_Lot S1: F0/1-4, F0/7-24, G0/1-2
1000 Native N/A

Objectives

  • Part 1: Build the Network and Configure Basic Device Settings
  • Part 2: Configure and verify two DHCPv4 Servers on R
  • Part 3: Configure and verify a DHCP Relay on R

Part 1: Build the Network and Configure Basic Device Settings

Step 1: Establish an addressing scheme

Subnet the network 192.168.1.0/24 to meet the following requirements:

  • One subnet, “Subnet A”, supporting 58 hosts (the client VLAN at R1). Record the first IP address in the Addressing Table for R1 G0/0/1.100.

  • One subnet, “Subnet B”, supporting 28 hosts (the management VLAN at R1). Record the first IP address in the Addressing Table for R1 G0/0/1.200. Record the second IP address in the Address Table for S1 VLAN 200 and enter the associated default gateway.

  • One subnet, “Subnet C”, supporting 12 hosts (the client network at R2). Record the first IP address in the Addressing Table for R2 G0/0/1. Record the second IP address in the Address Table for S2 VLAN 1 and enter the associated default gateway.

Step 2: Cable the network as shown in the topology.

Step 3: Configure basic settings for each router.

Open configuration window. Assign a device name to the router.

  • Assign a device name to the router. Router(config)# hostname <hostname>
  • Disable DNS lookup to prevent the router from attempting to translate incorrectly entered commands as though they were host names. Router(config)# no ip domain-lookup
  • Assign class as the privileged EXEC encrypted password.R1(config): enable secret class
  • Assign cisco as the console password and enable login. 
        R1(config)# line con 0
    R1(config-line)# password cisco
    R1(config-line)# login
  • Assign cisco as the VTY password and enable login. 
        R1(config)# line vty 0 1114
    R1(config-line)# password cisco
    R1(config-line)# login
  • Encrypt the plaintext passwords. R1(config)# service password-encryption
  • Create a banner that warns anyone accessing the device that unauthorized access is prohibited. R1(config)# banner motd # Authorized Access only #
  • Save the running configuration to the startup configuration file. R1# write memory
  • Set the clock on the router to today’s time and date. R1# clock set HH:MM:SS MON DD YYYY

Step 4: Configure Inter-VLAN Routing on R1

  • Activate interface G0/0/1 on the router.
  • Configure sub-interfaces for each VLAN as required by the IP addressing table. All sub-interfaces use 802.1Q encapsulation and are assigned the first usable address from the IP address pool you have calculated. Ensure the sub-interface for the native VLAN does not have an IP address assigned. Include a description for each sub-interface.
  • Verify the sub-interfaces are operational.

Step 5: Configure G0/0/1 on R2, then G0/0/0 and static routing for both routers

a. Configure G0/0/1 on R2 with the first IP address of Subnet C you calculated earlier. b. Configure interface G0/0/0 for each router based on the IP Addressing table above. c. Configure a default route on each router pointed to the IP address of G0/0/0 on the other router. d. Verify static routing is working by pinging R2’s G0/0/1 address from R1. e. Save the running configuration to the startup configuration file. Close configuration window

Step 6: Configure basic settings for each switch.

  • Assign a device name to the switch.
  • Disable DNS lookup to prevent the router from attempting to translate incorrectly entered commands as though they were host names.
  • Assign class as the privileged EXEC encrypted password.
  • Assign cisco as the console password and enable login.
  • Assign cisco as the VTY password and enable login.
  • Encrypt the plaintext passwords.
  • Create a banner that warns anyone accessing the device that unauthorized access is prohibited.
  • Save the running configuration to the startup configuration file.
  • Set the clock on the switch to today’s time and date. Note: Use the question mark (?) to help with the correct sequence of parameters needed to execute this command.
  • Copy the running configuration to the startup configuration.

Step 7: Create VLANs on S1.

  • Create and name the required VLANs on switch 1 from the table above.
  • Configure and activate the management interface on S1 (VLAN 200) using the second IP address from the subnet calculated earlier. Additionally, set the default gateway on S1.
  • Configure and activate the management interface on S2 (VLAN 1) using the second IP address from the subnet calculated earlier. Additionally, set the default gateway on S
  • Assign all unused ports on S1 to the Parking_Lot VLAN, configure them for static access mode, and administratively deactivate them. On S2, administratively deactivate all the unused ports.

Note: The interface range command is helpful to accomplish this task with as few commands as necessary.

Step 8: Assign VLANs to the correct switch interfaces.

  • Assign used ports to the appropriate VLAN (specified in the VLAN table above) and configure them for static access mode.
  • Verify that the VLANs are assigned to the correct interfaces. Question:

Why is interface F0/5 listed under VLAN 1?

F0/5 will be a trunk port, but trunking will be configured in the future.

Step 9: Manually configure S1’s interface F0/5 as an 802.1Q trunk.

  • Change the switchport mode on the interface to force trunking.
  • As a part of the trunk configuration, set the native VLAN to 1000.
  • As another part of trunk configuration, specify that VLANs 100, 200, and 1000 are allowed to cross the trunk.
  • Save the running configuration to the startup configuration file.
  • Verify trunking status.

Question: At this point, what IP address would the PC’s have if they were connected to the network using DHCP? Der PC bekommt eine APIPA Addresse: 169.254.0.0/16

Part 2: Configure and verify two DHCPv4 Servers on R

In Part 2, you will configure and verify a DHCPv4 Server on R1. The DHCPv4 server will service two subnets, Subnet A and Subnet C.

Step 1: Configure R1 with DHCPv4 pools for the two supported subnets. Only the DHCP Pool for

subnet A is given below

  • Exclude the first five useable addresses from e ach address pool.
  • Create the DHCP pool (Use a unique name for each pool).
  • Specify the network that this DHCP server is supporting.
  • Configure the domain name as ccna-lab.com
  • Configure the appropriate default gateway for each DHCP pool.
  • Configure the lease time for 2 days 12 hours and 30 minutes.
  • Next, configure the second DHCPv4 Pool using the pool name R2_Client_LAN and the calculated network, default-router and use the same domain name and lease time from the previous DHCP pool.

Step 3: Verify the DHCPv4 Server configuration

  • Issue the command show ip dhcp pool to examine the pool details.
  • Issue the command show ip dhcp bindings to examine established DHCP address assignments.
  • Issue the command show ip dhcp server statistics to examine DHCP messages.

Note: Der DHCP Pool zeigt alle IP Addressen an. Auch die, die vorher exkulidert worden sind.

Step 4: Attempt to acquire an IP address from DHCP on PC-A

  • Open a command prompt on PC-A and issue the command ipconfig /renew.
  • Once the renewal process is complete, issue the command ipconfig to view the new IP information.
  • Test connectivity by pinging R1’s G0/0/1 interface IP address.

Part 3: Configure and verify a DHCP Relay on R

In Part 3, you will configure R2 to relay DHCP requests from the local area network on interface G0/0/1 to the DHCP server (R1).

Step 1: Configure R2 as a DHCP relay agent for the LAN on G0/0/

Open configuration window

  • Configure the ip helper-address command on G0/0/1 specifying R1’s G0/0/0 IP address.
  • Save your configuration.

Step 2: Attempt to acquire an IP address from DHCP on PC-B

  • Open a command prompt on PC-B and issue the command ipconfig /renew.
  • Once the renewal process is complete, issue the command ipconfig to view the new IP information.
  • Test connectivity by pinging R1’s G0/0/1 interface IP address.
  • Issue the show ip dhcp binding on R1 to verify DHCP bindings.
  • Issue the show ip dhcp server statistics on R1 and R2 to verify DHCP messages.