If the label of your computer is missing and the system will power up, you can easily find serial number of laptop/PC as it is written into the BIOS on the system board.
Run an elevated command prompt, Enter the command “wmic bios get serialnumber” (without the quotations).
- The network consists of 8 PC and two switches
- split one physical network in two VLAN (VLAN 2 and VLAN 3)
- ports 1-10 assign to VLAN 2 on both switches
- ports 11-20 assign to VLAN 3 on both switches
- enable communication between computers in same VLAN on different switches
Continue reading “VLAN – configuring”
This is an example how to make static routing between two networks: 192.168.0.0/24 and 192.168.1.0/24. Connection between two routers is made using serial ports Serial 0/1/0 on both routers.
Continue reading “Configuring a Static Default Route”
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.
Continue reading “Traffic Types”
For access to router / switch using aux / auxiliary port with or without modem, we can set password.
Continue reading “Adding password for AUX / auxiliary port”
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.
Continue reading “Adding password for telnet access”
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:
Continue reading “Adding password to console 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).
Continue reading “Enable secret”