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Polish government wants to enforce Internet filtering to eliminate online gambling and child pornography. Everything for the benefit of our children, as this is the argument which is hard to stay against.

However, a notable group of Polish lawyers, journalists, academics, enterpreneurs, politicians and bloggers think otherwise and signed a letter (written by myself, btw) to President of Poland, Lech Kaczyński, asking him to turn the law down (in Polish legal system, president has the right to do this, but the parliament can then overcome president’s opposition if 2/3 of the delegates vote for it).

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Translated from Polish by Kamil Zawadzki

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We finished our last post writing about the Transport Layer of the OSI Reference Model of the network. Now, I’m going to summarize the Internet & Network layers of such model.

Internet Layer.

The Internet layer primarily defines the Internet Protocol (IP) and defines IP addressing, so, that devices can have its own unique IP. In addition, the Internet layer defines the process of routing to let routers deliver packets of data to the correct destination.

The data encapsulated in the Internet layer is a called a packet.

Network Layer.

The Network access layer defines the hardware and protocols required to deliver data across some physical network. It includes all the variations of Ethernet protocols, PPP and Frame Relay.

The data including Ethernet header/trailer and PPP header/trailer in the Network layer is called a frame.

In a brief, the TCP/IP model consists of the following layers:

• Application
• Transport
• Internet
• Network Access

The next post of this CCNA crash course will about the OSI reference model of the network.

A computer network with a tight security should be separated from the outside world as much, as it’s possible. It’s often the case. Even if there is a over a dozen of devices(PCs), that play different parts assigned to them in terms of company’s infrastructure, usually there is one that separates them from others, a firewall and a router.

On the assumption that the company’s policy is not too strict we often have an free access to this kind of devices. It can be various internal services, databases, servers of whatever is necessary to run a current company. What if, after work, when we are home safe and sound, we still need to connect to one of those servers that are not accessible outside the internal network.

I’ll describe few ways to do it.

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