Network Engineering

Questions tagged [certification]

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For questions involving certification of network hardware, software, cabling, etc. for use. This tag is not meant for educational certifications, e.g. CCNA.

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why doesn't WireShark show any traffic from invalid certificate https site? [closed]

i have tried mobile apps like HttpCanary and pc programs like wireshark still got nothing from the site !!
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1answer
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Radius and certificates

I'm trying to understand something. When a client and the radius server start the connection how does things work? Is it always a tls connection and does it use the symmetric encryption after ...
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2answers
125 views

What can I infer about a network connection using a cable tester (if anything)

I have a NS-468 cable tester for testing cables. This works fine but if I connect just one end of a RJ45 cable to a network, I only get 4 lights. This seems reasonable as I suppose 4 pins are for ...
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1answer
70 views

Can bad cabling affect the overall network?

TLDR: Can a handful of problematic lines negatively impact the performance of the network as a whole? ... or would any problems stop once it reaches the switch? Longer Version (background): A ...
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1answer
320 views

IPSEC VPN - Failed identity certification renewal

I've site-to-site VPN connection between an ASA and multiple Cisco routers. The identity certificates need to be renewed from time to time at the CA site and I didn't have problem until now. I'm ...
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1answer
420 views

What typically causes delay skew?

What causes delay skew in a typical copper network? From Wikipedia: "The Delay Skew test tests for the difference in propagation delay between the fastest and slowest set of wire pairs. An ideal skew ...
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3answers
766 views

An easy yet effective way to test if existing network cabling will be ok for GbE?

OK, so the story is this: I'm a school governor for my daughter's primary school here in the UK (roughly equivalent to being 'on the school board' in the USA, I think). I'm the IT governor (pretty ...