Discussion
Match the column Well-known ports used by TCP with the column Protocol.
| Well-known ports used by TCP | Protocol |
|---|---|
| a) 7 | i) Daytime |
| b) 9 | ii) Echo |
| c) 11 | iii) Discard |
| d) 13 | iv) SYSTAT |
Answer: C
The correct match is a-ii, b-iii, c-iv, d-i. Port 7 is the Echo service, port 9 is Discard, port 11 is SYSTAT and port 13 is Daytime. Every other option mixes up at least one of these well-known TCP ports, for example giving Daytime to port 7. These are the old simple services of TCP/IP that are rarely used today but are still listed as well-known ports below 1024.
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