N10-005 · Question #945
A user reports that one of their critical programs no longer functions after a recent router upgrade in the office. A network technician is called in to troubleshoot the issue and documentation…
The correct answer is D. TELNET. TELNET can be used to manually test TCP port connectivity by attempting to connect to a specific IP address and port number (e.g., telnet server 558). If the port is open and accessible, a connection is established; if blocked by a firewall or ACL on the upgraded router, the…
Question
A user reports that one of their critical programs no longer functions after a recent router upgrade in the office. A network technician is called in to troubleshoot the issue and documentation shows that the software needs full open connections over ports 558, 981, and 382 in order to function. Which of the following tools could the technician BEST use to troubleshoot this issue?
Options
- ANET USE
- BIPCONFIG
- CTRACEROUTE
- DTELNET
How the community answered
(37 responses)- A5% (2)
- B3% (1)
- C11% (4)
- D81% (30)
Explanation
TELNET can be used to manually test TCP port connectivity by attempting to connect to a specific IP address and port number (e.g., telnet server 558). If the port is open and accessible, a connection is established; if blocked by a firewall or ACL on the upgraded router, the connection fails. This directly tests whether the specific ports required by the application are reachable. NET USE maps network drives, IPCONFIG shows IP configuration, and TRACEROUTE traces the network path - none of these test whether specific TCP ports are open or blocked, making TELNET the best diagnostic tool for this scenario.
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