Linux Foundation LFCS Exam - Topic 7 Question 21 Discussion

Actual exam question for Linux Foundation's LFCS exam

Question #: 21
Topic #: 7

[All LFCS Questions]

What is true regarding TCP port 23?

APort 23 is the well known port for the telnet service which is a plain text protocol that should no longer be used.

BPort 23 is the well known port for the SSH service which provides secure logins.

CPort 23 is the well known port for the rlogin service which is SSL secured by default.

DPort 23 is the well known port for the system login services which are encrypted when the user runs the starttls command in his login shell.

Show Suggested Answer

Suggested Answer: A

by Leonora at May 08, 2022, 08:10 AM

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Kiley

5 months ago

I thought starttls was for email, not login shells?

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Jaclyn

5 months ago

rlogin is also outdated, but I thought it was on a different port.

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Fausto

5 months ago

Wait, isn't SSH on port 22?

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Tula

5 months ago

Totally agree, telnet should be avoided these days!

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Robt

5 months ago

Port 23 is definitely for telnet, not secure at all.

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Wei

5 months ago

I definitely remember that telnet is plain text, so I think A is the right answer, but I’m not 100% sure.

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Leah

5 months ago

I’m confused because I thought SSH was on port 22, but I can't recall what port 23 is definitively.

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Alba

5 months ago

I think I saw a practice question about telnet being insecure, so I’m leaning towards option A.

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Nickie

6 months ago

I remember studying that port 23 is associated with telnet, but I’m not sure if it’s still used in some cases.

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Mila

6 months ago

Ah, I see now. By making the process() method abstract, we're forcing the Humanoid class to implement it, which will allow the code to print "Helping... Done".

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Cristina

6 months ago

Hmm, I'm a bit unsure about this one. Should we start by raising awareness or do we need to define the behavior first? I'm not sure of the best approach.

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Cory

6 months ago

I remember something about the exclusion limits based on filing status, but was it $250,000 for singles?

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Carri

6 months ago

This seems like a straightforward question about project metrics. I think the answer is D - all of the above.

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