Detail the process of configuring and managing a DHCP server, including setting up scope options, reservations, and lease times, and troubleshooting DHCP-related issues.

Configuring and managing a DHCP (Dynamic Host Configuration Protocol) server is crucial for automatically assigning IP addresses and other network configuration parameters to devices on a network, simplifying network administration and preventing IP address conflicts. Here's a detailed breakdown of the process, including setting up scope options, reservations, and lease times, as well as troubleshooting common DHCP-related issues. We'll use examples from both Windows Server and Linux environments (specifically using ISC DHCP server on Linux). I. Setting Up a DHCP Server: A. Windows Server: 1. Installation: a. Open Server Manager. b. Click "Add roles and features." c. Select "Role-based or feature-based installation." d. Choose the appropriate server. e. Select the "DHCP Server" role. f. Follow the wizard to complete the installation. 2. Post-Installation Configuration: a. Complete DHCP Configuration: Click the "Complete DHCP configuration" link in Server Manager after the installation finishes. b. Authorization: If the server is part of an Active Directory domain, authorize the DHCP server in Active Directory. B. Linux (ISC DHCP Server): 1. Installation: a. Update the package manager: ``` sudo apt update (for Debian/Ubuntu) sudo yum update (for CentOS/RHEL) ``` b. Install the DHCP server: ``` sudo apt install isc-dhcp-server (for Debian/Ubuntu) sudo yum install dhcp (for CentOS/RHEL) ``` 2. Configuration File: The main configuration file is typically located at `/etc/dhcp/dhcpd.conf`. II. Configuring DHCP Scopes: A DHCP scope is a range of IP addresses that the DHCP server can assign to clients. A. Windows Server: 1. Open DHCP Manager: a. Go to Server Manager -> Tools -> DHCP. 2. Create a New Scope: a. Right-click the DHCP server and select "New Scope." b. Follow the New Scope Wizard: i. Scope Name: Provide a descriptive name for the scope (e.g., "Main Network"). ii. IP Address Range: Define the starting and ending IP addresses for the scope (e.g., 192.168.1.100 - 192.168.1.200). iii. Subnet Mask: Enter the subnet mask for the network (e.g., 255.255.255.0). iv. Add Exclusions: Specify any IP addresses within the range that should not be assigned by the DHCP server (e.g., static IP addresses assigned to servers or printers). v. Lease Duration: Set the lease duration (the amount of time a client can use an assigned IP address). The default is typically 8 days. vi. Configure DHCP Options: Configure common DHCP options such as the default gateway, DNS server addresses, and WINS server addresses. B. Linux (ISC DHCP Server): 1. Edit the Configuration File (`/etc/dhcp/dhcpd.conf`): ``` subnet 192.168.1.0 netmask 255.255.255.0 { range 192.168.1.100 192.168.1.200; option routers 192.168.1.1; option domain-name-servers 8.8.8.8, 8.8.4.4; default-lease-time 86400; # 24 hours max-lease-time 604800; # 7 days } ``` - `subnet`: Defines the network address and subnet mask for the scope. - `range`: Specifies the range of IP addresses to be assigned. - `option routers`: Sets the default gateway I....