NETWORKING

TCP/IP for Beginners

Build the networking foundation needed for support, data center, cybersecurity, cloud, and network roles.

Practical focus: use this guide as a learning framework. Verify changing details such as salaries, prices, certification requirements, product specifications, and job-market conditions against current authoritative sources.

IP addressing

An IP address identifies an interface in an IP network. The prefix/subnet mask identifies the network portion.

Default gateway

A host uses its gateway to reach destinations outside its local subnet.

TCP and UDP

TCP provides connection-oriented transport features; UDP is connectionless and has different performance and reliability characteristics.

Ports

Applications use port numbers to identify services at the transport layer. Ports are not physical switch ports.

Troubleshooting mindset

Ask: Is the link up? Is addressing correct? Is the destination local or routed? Does name resolution work? Is a policy or service blocking the connection?

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