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https://en.wikipedia.org/wiki/Calculus

1. line vty 0 15
2. login authentication
3. username admin pri 15 admin
4. aaa authentication login default local
5. aaa authorization exec default local
6. aaa new-model

Problems of AAA if without using / assigning command's point 5: any user that successfully login into a router will be placed into user mode (>) not into priviliged exec mode(#).

Every user on the same privilege level can access/execute same set of command.
By default every command in cisco is assigned level 1 dan 15.
Level 0 ada tapi jarang digunakan. Level 0 includes following five commands:

• disable
• enable
• exit
• help
• logout

Contoh misi:
Kamu mau membatasi perintah yang tersedia untuk user yang terhubung ke suatu port hanya ke Telnet. Kamu bisa melakukan dengan ini:
1. Mengkonfigurasi port itu ke privilege level 0
2. Menurunkan level privilige perintah Telnet ke level 0

1. Configuring a username privilege

Studi tentang Exec modes

Exec modes ada 2:
1. User exec mode
2. Privillege exec mode

Tiap mode exec bisa di proteksi:
Proteksi user exec mode username dan password.
Proteksi privillege exec mode itu enable secret/ enable password.

Tingkat privillege / privillege level
Tingkat privilege ada: 1 - 15.
User exec mode default privillege level 1
Default privilege level privillege exec mode 15.

Commands
Tiap command memiliki level privillege.
Privillege mode include all user exec mode
You can move command to any privilege level

Human is privilege level 1. God is privilege level 15.

Anything that executed inside # sign

Debug type

• Event
• for example: debug ip dhcp server events
• Packet
• for example: debug ip dhcp server packet