On the router, we are going to execute the following commands which will secure access to the console port, the aux port and the VTY lines:

R1 (config)#line con 0
R1 (config-line)#exec-timeout 0 0
R1 (config-line)#password cisco
R1 (config-line)#logging synchronous
R1 (config-line)#enable password cisco
R1 (config-line)#line vty 0 4
R1(config-line)#login
R1(config-line)#password cisco
R1(config-line)#exec-timeout 0 0
R1(config-line)#line aux 0
R1(config-line)#exec-timeout 0 0
R1(config-line)#login
R1(config-line)#password cisco

Checking if the privilege level is configured on R1:

R1#show privilege
Current privilege level is 15

Configuring custom privilege levels by adding the following entries to the authentication database on R1:

R1(config)#username cisco0 privilege 0 password cisco0
R1(config)#username cisco15 privilege 15 password cisco15
R1(config)#username cisco7 privilege 7 password cisco7
R1(config)#aaa new-model
R1(config)#aaa authentication login default local