Few more command We can use, but we can't configure this in packet tracer.R1(dhcp-config)#netbios-server x.x.x.x 'where x.x.x.x is ip address of netbios server.R1(dhcp-config)#lease x 'where X is the number it sets the lease time,by default 1 (i.e. one day).R1(dhcp-config)#ip dhcp excluded address x.x.x.x x.x.x.x 'Range of ip address excluded from the pool it will not be leased to the clients'.R1(dhcp-config)#ip dhcp excluded address x.x.x.x 'To exclude only one ip address from the range of ip address'.