Author Archives: Bogdan

No IP Domain Lookup

If you want to disable DNS resolving when you mistype a command this is what you should do:

ena
conf t
no ip domain-lookup
end
sh ru

How to setup a site to site vpn tunnel between two cisco routers

CCNA3 activity 4 4 2 challenge vtp configuration

CCNA3 activity 4 4 2 challenge vtp configuration

Switch 31 with 17 on CCNA3 activity 4.4.2

Basic configuration on devices

Basic configuration on devices:

  • set hostname;
  • set secret password;
  • set banner motd;
  • encrypt passwords;
    • line console 0

    • set synchronous logging
    • set idle time
    • set password
    • use login
    • line vty 0 15

    • set password
    • use login
    • set history size

Below you have the commands. The hostname is at the end, because if you want to copy-paste them, you will have to modify the hostname:

enable
conf t
enable secret cisco
banner motd #AUTHORIZED ACCESS ONLY !#
service password-encryption
line console 0
logging synchronous
exec-time 0 0
password cisco
login
history size 256
line vty 0 15
password cisco
login
history size 256
exit
hostname

Different types of memory that a computer uses

The different types of memory that a computer uses, in order of fastest to slowest, are as follows: memory inside CPU – L1 cache; memory in the [..]

When to use straight through cable and when to use crossover cable


On the left hand side are devices that use straight-through cable and on the right hand side are devices that use crossover cables.
These are the devices that use a straight-through cable:

  • Switch – Router
  • Switch – PC
  • Switch – Server
  • Hub – PC
  • Hub – Server

These are the devices that use a crossover cable:

  • Switch – Switch
  • Switch – Hub
  • Hub – Hub
  • Router – Router
  • Router – PC
  • Router – Server
  • PC – PC

But nowadays the standard is becoming obsolete due to the fact that Auto-MDIX (automatic medium dependent interface crossover) technology on devices grows with each device that supports it. This means that ports do not need to know what type of cable is used when you connect two devices.

Subnet zero and the all ones subnet

Subnet zero and the all ones subnet

From Scratch

Starting from Scratch !

With the use of my memory, twitter and google I will rebuild this blog.

Unfortunately I’ve deleted the DB and after two days of recovery nothing was recovered.