I am using a dlink router at home and I want to know how to adjust it and is it possible to adjust it always?

I recently started learning CCNA and I found about Packet tracer but I don't know what it is. What is the use of Packet tracer?

I think to study CCNA I must have clear idea about it. So, please help me with the answer.

What is the role of SLIP or Serial Line IP on a network system and where do we commonly use it?

Is it possible to retain the analog Panasonic phones in our office even though we plan to change the brand of our company's Pabx?

How do exactly Voip works and how do they say that the said solution can lower the cost of communications?

What OSI layer contains all protocols and methods that fall into the realm of process-to-process communications across an Internet Protocol (IP) network?

Does Internet Packet exchange/ sequential or IPX/SPX can be use over the Internet?

If yes, how exactly it goes?

If no, why?

What is the difference between a Fast ethernet switch and a Gigabit ethernet switch?

What are the advantages and disadvantages of the two?

Hello,

When I try to connect to computers in my wireless LAN I get this message.

"Windows cannot access \(computer name).

I can connect to the internet. I run Windows 7 Ultimate 64bit.

All other computers are Windows XP.

Windows Cannot Access \SABINA- PC

Check the spelling of the name. Otherwise there might be a problem with your network. To

Try to identify and resolve problems, click Diagnose.

Thank you

I wanted to download .NET framework for my pc as some software requires it being pre installed on the pc. 

Where can I get to download the file for free? Any suggestions.