A scope, in the context of network services, refers to the configured pool of IP addresses that can be used for dynamic assignment to hosts within a network segment. Defining this range is essential for a network administrator to effectively manage the IP address allocation and ensure efficient network operations. An exclusion range is a set of IP addresses within a scope that is excluded from being leased to devices. A reservation is a method to ensure a specific device always receives the same IP address. Lease time determines how long a host can use an IP address before needing to renew its lease.