Which Cisco collaboration deployment model places a single Cisco Unified Communications Manager (CUCM) cluster at a central data center and serves remote sites through the WAN?
Infrastructure And Design
Question · Easy
A CUCM cluster has one Publisher and four Subscribers. What is the primary role of the Publisher?
Question · Medium
Chapter 1: Collaboration Architecture, Deployment Models, Sizing & Upgrades
1.1 Collaboration Architecture & Deployment Models
Study guide
Which two design factors are MOST important when sizing a CUCM cluster for a new deployment? (Choose the BEST answer.)
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An audio call uses the G.711 codec with a 20 ms packetization period over an Ethernet WAN. What is the approximate per-call bandwidth, including IP, UDP, RTP, and Layer 2 overhead?
Which Cisco-recommended bandwidth value is commonly used for a G.722 (wideband) audio call at 20 ms packetization over Ethernet?
Which Cisco edge device is purpose-built as a Session Border Controller (SBC) on Cisco IOS XE for connecting to SIP trunk providers and Webex Calling Local Gateway?
1.2 Capacity Planning, Sizing & Bandwidth Considerations
In a Cisco collaboration deployment, which DNS record type does a Jabber or Webex App use to discover SIP/Expressway service hosts during MRA login?
Which network service must be accurate to within milliseconds across all CUCM nodes, gateways, and endpoints to ensure proper call detail records, certificate validation, and database replication?
An engineer is troubleshooting why CUCM is not pulling user accounts from Active Directory. Which protocol is used between CUCM and the corporate directory for the synchronization process?
Which two security technologies are part of CUCM's default security mode for encrypting signaling and media between phones and CUCM? (Choose the BEST single answer.)
1.3 High Availability, Redundancy & Disaster Recovery
Which Cisco edge product is specifically designed to provide secure firewall traversal for Mobile and Remote Access (MRA), allowing remote Jabber and Webex App clients to register to CUCM without a VPN?
Which Cisco collaboration design provides geographic redundancy and disaster recovery for CUCM by spreading nodes across two data centers in a single cluster?
Question · Hard
An engineer is preparing a CUCM cluster upgrade. Which best practice MUST be followed before initiating the upgrade?
When troubleshooting a TLS handshake failure between an endpoint and CUCM, an engineer captures the exchange and finds the client rejects the server certificate. Which CUCM trust store usually must include the issuing CA certificate so the endpoint can validate it?
1.4 Cisco Unified CM Cluster Upgrade Process
Which feature does Cisco use to enable Single Sign-On for Jabber and Webex App, allowing token-based authentication against an Identity Provider (IdP) such as Okta, Azure AD, or PingFederate?
An engineer notices DNS A records resolve correctly but Jabber MRA login fails with 'Cannot communicate with server'. What is the MOST common DNS misconfiguration to check next?
In Cisco collaboration solutions, what is the primary function of the Quality of Service (QoS) trust boundary?
Which collaboration deployment moves call control to Cisco's cloud while keeping the customer responsible for endpoints, network QoS, and the Local Gateway for PSTN?
Chapter 2: Edge Architecture, Security & Network Services
2.1 Collaboration Edge Architecture: CUBE & Expressway
Which deployment option provides a dedicated single-tenant cloud-hosted Cisco UCM environment that is operated by Cisco and managed via Webex Control Hub?
Which two design figures are typical Cisco recommendations for one-way latency and jitter for high-quality VoIP? (Choose the BEST answer.)
Which SIP method is used by an endpoint to initiate a new call?
Protocols And Endpoints
Which SIP response code indicates a successful final response to an INVITE, meaning the call has been answered?
2.2 Security Protocols & PKI: SSO, OAuth, TLS & SRTP
Which SIP method is used to terminate an established session?
Which SIP message body format is used to describe the media capabilities (codecs, RTP ports, addresses) for an INVITE/200 OK exchange?
Which RFC defines DTMF transport via RTP named telephone events that Cisco voice gateways and CUBE rely on for SIP DTMF interworking?
Which DTMF method sends digit events as XML payloads inside SIP NOTIFY messages and is commonly used by Cisco SIP IP phones for KPML-based digit collection?
2.3 Network Infrastructure Services: DNS, NTP, DHCP & LDAP
An engineer is troubleshooting Hold/Resume across a SIP trunk. Which SIP message indicates that a media stream has been put on hold by the holding party?
Which SIP method is used to perform an attended or blind transfer in SIP?
An IP phone is being added to a CUCM cluster. Which method allows the user to enter a short code at the phone keypad after first boot to associate it with their user profile, without an admin pre-configuring the MAC address?
Which onboarding method is used by Webex App and Webex Devices in modern Cisco deployments to register without entering CUCM-style TFTP options?
Chapter 3: Protocols, Codecs & Endpoint Provisioning
3.1 SIP Signaling Architecture & Call Flows
When troubleshooting a Cisco IP phone that fails to register and shows 'Configuring IP', which two items should the engineer verify FIRST? (Pick the BEST answer.)
Which legacy Cisco-proprietary call signaling protocol historically used by Skinny Client Control Protocol phones is being deprecated in favor of SIP for IP phone registration?
Which two Cisco endpoints are designed primarily for personal desktop video collaboration with Webex App integration?
Cisco recommends which transport for SIP signaling between CUCM and modern endpoints when secure mode is enabled?
3.2 Session Description Protocol (SDP) & Early Offer vs. Delayed Offer
Which Webex video codec is used by Webex devices to deliver high-quality video at lower bandwidths and is the successor to H.264 for many cloud video flows?
An endpoint sends INVITE but the call ends with 488 Not Acceptable Here from CUCM. What is the MOST likely root cause?
An engineer is dialing 9.@ on a Cisco IOS XE voice gateway POTS dial peer to a PRI. After the user dials 9 and the destination digits, calls fail with no progress. Which dial-peer attribute is MOST likely missing or wrong?
Voice Gateways And Sbc
On a Cisco IOS XE gateway, which dial peer type matches an outbound IP destination via SIP or H.323?
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