Linux › Section I · Your network and its configuration › Topic I.9
The transport layer: TCP, UDP, and services
IP gets data to the right machine; port numbers get it to the right program. This topic shows how to list the connections and listening services on a Linux host with ss, how to tell a client from a server at a glance, and why some ports need root.
In this topic
- From hosts to programs
- TCP connections and UDP sockets
- Listing sockets with ss
- Reading a connection line
- Client or server?
- Worked example: who started each connection?
- Listening sockets and exposure
- Worked example: auditing a server
- Service names and privileged ports
- Common mistakes to avoid
- Key takeaways
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