Continue your lesson
Follow traffic from the endpoint through each device, protocol, and service in the path.
Block 1 of 1Compare SSH · DNS · DHCP · NTP
Current · 15 min
Compare SSH · DNS · DHCP · NTP
Optional concept notes
SSH
Provides encrypted interactive remote administration normally over TCP port 22.
Cross-certificationA+ ↔ Net+ ↔ Sec+
Remote administration services
RDP and SSH both support remote administration, but they are not interchangeable. RDP is graphical and normally uses TCP/UDP 3389; SSH is command-line access over TCP 22. Security+ adds the question of whether either service should be exposed at all.
DNS
Resolves names and records normally using port 53.
Cross-certificationCCNA ↔ Net+
DNS
The core idea stays the same. The surrounding objective changes the evidence, decision, or task the exam asks for.
DHCP
Automatically supplies clients with addressing and other network parameters.
Cross-certificationCCNA ↔ Net+
DHCP
The core idea stays the same. The surrounding objective changes the evidence, decision, or task the exam asks for.
NTP
Synchronizes device clocks normally using UDP port 123.
Complete one provider lesson, then answer four related questions. That is enough for today; more practice is optional.
Your lesson stays open here while the provider opens in another tab. Choose one source; the notes above are optional.
Practice the reasoning here
Sketch a small network or packet path. Predict the expected state, introduce one fault, and identify the observation that isolates it.
- State the expected result before changing or testing anything.
- Name the observation, command, log, or report that would confirm it.
- Explain why the closest alternative does not fit the same requirement.
Check the whole objective
This unlocks objective 1.4 for recall. The latest checkpoint needs 70% or higher; a lower result puts the lesson back near the front of your timeline.