300-820 · Question #233
Which method is used to send the incoming call request to the client when the traversal server receives an incoming call for the traversal client?
The correct answer is A. using an existing keep alive connection opened by the client. When the traversal server (Expressway-E) receives an incoming call for the traversal client (Expressway-C), it uses the existing keepalive connection that was initiated by the traversal client. This is a core principle of the Mobile and Remote Access (MRA) architecture, which…
Question
Which method is used to send the incoming call request to the client when the traversal server receives an incoming call for the traversal client?
Options
- Ausing an existing keep alive connection opened by the client
- Bopening an outbound connection directly to the client through the firewall
- Crequesting for permission from the firewall
- Dopening an inbound connection directly to the client through the firewall
How the community answered
(70 responses)- A91% (64)
- B4% (3)
- C1% (1)
- D3% (2)
Explanation
When the traversal server (Expressway-E) receives an incoming call for the traversal client (Expressway-C), it uses the existing keepalive connection that was initiated by the traversal client. This is a core principle of the Mobile and Remote Access (MRA) architecture, which relies on outbound connections from inside to outside to traverse NAT/firewalls securely and without requiring inbound openings.
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