300-920 Question #34: Real Exam Question with Answer & Explanation

The correct answer is D. SSH. SSH requires two separate connections when using Cisco's xAPI: one connection handles commands (xCommands and xConfigurations), while a second, independent connection is needed to receive asynchronous notifications and feedback (xFeedback subscriptions). This split-connection arc

Webex Devices and SDKs

Question

Which xAPI access mechanism requires separate connections for commands and notifications?

Options

ASerial
BWebSocket
CHTTP/HTTPS
DSSH

Explanation

SSH requires two separate connections when using Cisco's xAPI: one connection handles commands (xCommands and xConfigurations), while a second, independent connection is needed to receive asynchronous notifications and feedback (xFeedback subscriptions). This split-connection architecture is a defining characteristic of SSH-based xAPI access.

Why the distractors are wrong:

WebSocket (B) uses a single persistent, full-duplex connection that handles both commands and real-time notifications simultaneously - no second connection needed.
HTTP/HTTPS (C) is a request-response protocol where you poll for status or use webhooks; it doesn't have a dedicated separate notification channel in the same architectural sense.
Serial (A) provides a single bidirectional channel over a direct physical link, handling both directions on one connection.

Memory tip: Think of SSH as "Separate Handling Shell" - it separates command input from notification output into two distinct connections, unlike WebSocket which keeps everything on one wire.

Topics

#xAPI#SSH#Access mechanisms#Device communication

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