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5
votes
5answers
2k views

Why can't two hosts (in two different logical networks) connected to each other through cross-over cable communicate?

Let us say, i have two computers (hosts) A and B. Where A has been assigned an IP address of 192.168.1.10/24 and host B has been assigned an IP address of 192.168.2.11/24. And both of them has been ...
2
votes
2answers
329 views

Understanding VLAN tagging

Let's say we have 4 machines connected to a layer 2, managed switch which is connected to a layer 3 switch. Say that 1.2.3.0/24 is routed to the layer 3 switch. Our goal is to have 1.2.3.0-63 usable ...
5
votes
2answers
4k views

How does a layer-2 switch work with UDP?

If UDP and/or TCP send packets via IP to an Internet Protocol Address, how can a layer-2 switch forward these? Is this possible or do you need a layer-3 switch?
0
votes
1answer
617 views

theory: connecting two computers with ethernet cable [closed]

I am fairly new to networking but have done manual Linux command line wireless connections and home router configuration. The internet is full of how-to guides on transferring files between two ...
4
votes
3answers
562 views

What practices/ mechanisms/ protocols can be used to secure communication on physically exposed Ethernet links?

Given that Ethernet cables are everywhere and use for all kinds of links and it is assumed they are physically guarded, hence typical installations do not leverage any "secure" mechanisms. Let's say ...
2
votes
1answer
268 views

Metro Ethernet no layer 3 connectivity

We're working with a metro ethernet provider to bring up a new multi-point connection between our sites. Currently we're just trying to get it working with two sites. As a simple test I've plugged in ...