CISSP-ISSMP · Question #176
Drop the appropriate value to complete the formula. Answer:
The correct answer is B. TCP port 22. This question tests knowledge of standard TCP/UDP port assignments, specifically the port used by SSH for secure remote connectivity.
Question
Exhibit
Options
- AUDP port 161
- BTCP port 22
- CUDP port 138
- DTCP port 443
How the community answered
(22 responses)- A5% (1)
- B77% (17)
- C14% (3)
- D5% (1)
Why each option
This question tests knowledge of standard TCP/UDP port assignments, specifically the port used by SSH for secure remote connectivity.
UDP port 161 is assigned to SNMP (Simple Network Management Protocol), used for monitoring and managing network devices, not for establishing secure remote sessions.
TCP port 22 is the well-known port assigned to SSH (Secure Shell), a protocol that provides encrypted, authenticated remote access and secure file transfer. SSH requires TCP because it depends on reliable, ordered, connection-oriented delivery of data packets. Supplying TCP port 22 correctly completes any formula or rule referencing an SSH-based secure channel.
UDP port 138 is the NetBIOS Datagram Service port, used for Windows network browsing and legacy file sharing, unrelated to secure shell access.
TCP port 443 is assigned to HTTPS (HTTP over TLS), used for encrypted web traffic, not for SSH or the specific service referenced in this formula.
Concept tested: SSH protocol and TCP port 22 assignment
Source: https://www.iana.org/assignments/service-names-port-numbers/service-names-port-numbers.xhtml
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