In an H.323 call that is not interworked, which three signaling protocols are routed through the Expressway? (Choose three.)
Correct Answer: B,D,F
In an H.323 call that is not interworked, meaning that both the caller and the callee are using the H.323 protocol, the Expressway acts as an H.323 gatekeeper and routes the following signaling protocols through itself: * Q.931: This is the call signaling protocol that is used to establish, maintain, and terminate calls between any two H.323 entities. Q.931 messages are exchanged over a TCP connection between the endpoints and the Expressway. The Expressway can perform address translation, admission control, and call routing based on the Q.931 messages. * RAS: This is the registration, admission, and status protocol that is used between an H.323 endpoint and the Expressway to provide services such as endpoint registration, address resolution, bandwidth management, and zone management. RAS messages are exchanged over a UDP connection between the endpoints and the Expressway. The Expressway can accept or reject registration requests, allocate bandwidth, and monitor the status of the endpoints based on the RAS messages. * H.245: This is the control protocol for multimedia communication that is used to negotiate the capabilities, open and close logical channels, and exchange control and indication signals for audio, video, and data streams. H.245 messages are exchanged over a TCP connection between the endpoints and the Expressway. The Expressway can modify or enforce the capabilities, allocate ports, and relay the media control signals based on the H.245 messages. The other protocols, such as RTP, RTCP, and H.254, are not routed through the Expressway in an H.323 call that is not interworked. RTP and RTCP are the protocols for sending or receiving multimedia information (voice, video, or text) between the endpoints. H.254 is not a valid protocol name, but it might be a typo for H. 264, which is a video coding standard that defines how video streams are compressed and decompressed. These protocols are exchanged directly between the endpoints over UDP connections, without involving the Expressway. References := Cisco Expressway Administrator Guide (X14.0) - About H.323Cisco Expressway Basic Configuration Deployment Guide (X14.0) - H.323 Call Flow [Cisco Expressway Administrator Guide (X14.0) - Configuring H.323]
Question 77
Which description of Cisco WebEx Telepresence is true?
Correct Answer: D
Question 78
Which option do Enterprise settings on Cisco Spark determine?
Correct Answer: A
= Enterprise settings on Cisco Spark determine where user information comes from. Enterprise settings allow the administrator to configure the identity source for Cisco Spark users, either from the Cisco Collaboration Cloud or from an external directory service such as Active Directory. Enterprise settings also allow the administrator to enable or disable single sign-on (SSO) for Cisco Spark users, using a third-party identity provider such as Okta or Ping Identity. Enterprise settings also control the user license assignment and the user synchronization frequency123 References := 1Cisco Spark Control Hub Administration Guide 2Cisco Spark Control Hub - Manage Your Organization's Settings 3Cisco Spark Control Hub - Manage Users
Question 79
Which option is a method for controlling bandwidth within a subzone?
Correct Answer: D
Interoperability is a method for controlling bandwidth within a subzone on the Expressway. Interoperability allows the Expressway to adjust the bandwidth of calls based on the capabilities and preferences of the endpoints involved. For example, if a SIP endpoint calls an H.323 endpoint, the Expressway can downspeed the call to match the lower bandwidth of the H.323 endpoint. Interoperability also enables the Expressway to interwork different protocols, such as SIP and H.323, and different media formats, such as H.264 and H.263. Interoperability can be configured on the Expressway by setting the interoperability mode and the interoperability profile for each subzone. The interoperability mode determines whether the Expressway will try to interwork calls within the subzone or not. The interoperability profile defines the parameters for interworking, such as the preferred protocol, the preferred media format, and the maximum bandwidth. To configure interoperability on the Expressway, go to Configuration > Local Zone > Default Subzone or Configuration > Local Zone > Subzones and select the subzone you want to modify. Then, go to the Interoperability section and select the interoperability mode and profile for the subzone. References := Cisco Expressway Administrator Guide (X15.0) - InteroperabilityCisco Expressway Basic Configuration Deployment Guide (X15.0) - Configuring Interoperability
