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jcbermu

Madrid, Spain

I have been in networking for more than 20 years, during that time I've expanded my knowledge to Linux, python , javascript and VBA for Excel.

Recently my interest has been in VoIP and mainly Asterisk.

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Top Questions

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Top Answers

Why was port 80 chosen as the default HTTP port and 443 as the default HTTPS port?

Did Windows ever support any hardware architectures other than x86?

Why can't I use the first or last address in a subnet?

Can EXE always be replaced with COM?

What happens to TCP connections when I remove the ethernet cable?

Confusion with storage capacity (powers of 10 and 2)

Why doesn't mobile broadband have interference problems?

Do most music CDs contain the needed info about their tracks?

Difference between owner/root and RUID/EUID

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Pinging different IP address than what I entered

Setting multiple groups as directory owners

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AND function gives TRUE result for empty, BLANK cell - why?

What can I do to protect my data on laptop if it were stolen?

Why Windows 10 is... number ten?

Why are subnet-masks relevant for the individual computer on the network?

What is $PWD? (vs current working directory)

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Why do SSD sectors have limited write endurance?

How do I save a link to a webpage as a shortcut in the Windows file manager?

Why is the most powerful user on a Unix/Linux system called “root?”

How do I remove the background from an image?

How does a packet get corrupted in a network?

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*nix equivalent of Active Directory?

Where can I use the IPv6 documentation prefix

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Is it possible to have iOS simulator in my Linux Mint?

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What Colours Are Available To Use With a Custom Number Format EXCEL

Does it matter about the amount of the swap area in Linux system

Does the sequence number of TCP packet headers wrap around?

What is SNR Margin and Line Attenuation?

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I sometimes get lag spikes causing ping times of 200 ms; might using different (e.g. Google's) DNS servers be better?

Why does DHCP uses UDP port 67 and 68 for the communication between the client and server?