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Doubts about Wireless Routers

I want to buy a new Wireless Router for my HOME OFFICE, and i have the following Doubts:

1- What does it means that it has " GIGABIT Ethernet Support"

2- What are this 2 frequencies: 2.4 Ghz and 5Ghz? (I live in Costa Rica)

3- Does the wireless router already have a " VPN Firewall (Virtual Private Network) ", or is this a separate hardware that i have to buy? Here is a quote from something i read on Cnet : " If you need to access your network from remote locations on business trips, you may even want to invest in a hardware VPN (virtual private network) firewall so that you can securely access your home network over the Internet." ....

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mikeewalton

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pedrorosa74032

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Kechka

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unrinoceronte

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Thanks a lot, all 3 where very good answers that complemented each other.

thanks, and please if you can Check my last comment, and if possible respond to it.

unrinoceronte

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Take a look at this other related question and please comment if you can:

https://www.experts-exchange.com/questions/24367386/Gigabit.html