You have to check out TCP/IP For Dummies – a must for anyone wanting to learn networking concepts.
SearchNetworking.com is a great online resource. They have an entire section of their site devoted to network management topics, as well as a network management newsletter which you can subscribe to. To catch up on SearchNetworking.com’s recent tips, you can find them in the network management tip index.
You may also find some video tutorials on YouTube.
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