Ccnp

The manual routing of the network administrator is called static routing. When the network structure changes, these routers also need to be changed manually. They are not meant to be replaced by any dynamic routing protocol.

Router>enable
Router#confgigure terminal
Router(config)#ip route 192.168.1.0 255.255.255.0 192.168.0.1

In the example above, the 192.168.1.0/24 network is routed to the 192.168.0.1 gateway.

Predefined Routing

The addresses that the router cannot find as a result of the static and dynamic routing definitions are directed to a predefined address. In case there are roads that can be overlooked as a result of static or dynamic routing, it is recommended to enter the default routing definition to the routers. By default, to route all networks to the 192.168.0.1 gateway;

Collision is called the error that occurs at the same time both during packet sending and receiving. This is especially the case for devices that operate half-duplex, such as Hub and Repeater, that is, cannot send and receive packets from one port at the same time. Collision Domain is the area where there is a collision. In other words, it is a region where a collision can take place. Since Hubs and Repeaters send the packets they receive to all ports, there is one Collison Domain regardless of how many hubs and devices connected to the hub. Routers and switches have as many ports as there are Collision Domains. Because there is only one packet collision probability on each port. Briefly; While there is one collision domain at the hub, the switches and routers have as many collision domains as each port. Therefore, it is better to use switches and routers instead of hubs in professional networks

Telnet gibi güvenlik açığı olan bir protokol kullanmak yerine giriş bilgilerinizi ve verileri akışlarınızı şifreleyecek daha güvenli olan bir protokol olanSecure Shell (SSH) kullanabilirsiniz. Bu sizi ve verilerinizi daha güvende hisetmenizi sağlayacaktır.
Şimdi adım adım SSH nasıl kurulacağını göreceğiz:

1. Hostname settings are made:

Router(config)#hostname techsoftcenter

2. The domain name is set (here hostname and domain name are required to generate encrypted keys):

Todd(config)#ip domain-name techsoftcenter.com

3. Encrypted keys are generated to securely conduct the session:

GNS3 is a platform that allows you to create a simulation of a lab environment in a virtual environment without the need to interact directly with network equipment. Thanks to the graphic interface, users can establish a real network structure and make the necessary test studies. GNS3 can run on Windows, Linux, and MAcOSx.

GNS3 software is freeware. It allows you to test the products of many manufacturers. For network devices such as Cisco, Huawei, Mikrotik, etc.

Often after installing PacketTracer 7, we get an error like the one below.

error while loading shared libraries: libpng12.so.0: cannot open shared object file: No such file or directory

Now let’s see how to fix this error.

After downloading the Packet Tracer, open the terminal in the same directory and extract it from the compressed tar.gz file.

sudo tar -zxvf packetracer7.tar.gz

Let’s enter the folder with the files we opened, if we are in the same directory, let’s run the install bash file without doing anything.