AS (Autonomous System) is group of networks controlled by one administrator (With common administration), as one ISP or enterprise organisation. According to way how they exchange routes, within an AS or between them, we can divide routing protocols to IGP and EGP Continue reading “IGP vs EGP”
Routing protocols use different traffic types to control how routing information are exchanged.
For access to router / switch using aux / auxiliary port with or without modem, we can set password.
For access to router / switch using Telnet we use the Virtual Teletype (VTY) lines. To protect VTY port from unwanted access, we must configure password on this port. Also, if password is not configured and enabled, Telnet access will not be possible.
There is only one console port on all routers / switches, so the mark is console 0. To protect console port from unwanted access, we must configure password on this port:
The Enable secret is used to allow security when an administrator is going from user mode to privileged mode, same as Enable password. It is used to protect privileged mode on equipment which is not physically secured. The Enable secret is an newer, encrypted command that should be in use instead of Enable password (password it is stored in startup-config file in encrypted form).
The Enable password is used to allow security when an administrator is going from user mode to privileged mode. It is used to protect privileged mode on equipment which is not physically secured. The Enable password is an old, non-encrypted command that should not be anymore in use (password it is stored in startup-config file non-encrypted). Continue reading “Enable password”
There are three ways to connect to router or switch.
- Using console port
- Using Telnet over network
- Using auxiliary port
It normaly should be done from privileged EXEC mode: Continue reading “How to see current startup or running configuration”
There is example how to change router or switch name on new or equipment with deleted configuration files. In this case, it is changing default router name from ROUTER to R1. Continue reading “Changing router / switch name”