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Question 241

Which CUCM object is used to provide a collection of partitions that a device is allowed to search?

1. Route List
2. Device Pool
3. Region
4. Calling Search Space

Correct Answer: 4

Explanation

A Calling Search Space, or CSS, contains an ordered list of partitions that a device, line, or user is allowed to search. When a call is placed, CUCM uses the caller’s CSS to determine whether the destination is accessible. This mechanism is fundamental to implementing dialing permissions and separating different classes of destinations. Route lists manage gateway routing, device pools provide common endpoint settings, and regions control codec and bandwidth relationships. When a user can access some destinations but not others, administrators should examine both the destination partition and the caller’s CSS. Proper CSS design provides controlled and predictable call routing.

Question 242

Which SIP response code indicates that the requested resource cannot be found?

1. 404
2. 486
3. 503
4. 200

Correct Answer: 1

Explanation

SIP response code 404 indicates that the requested resource could not be found. In a collaboration environment, this may occur when a destination URI, number, or requested resource is not recognized by the receiving SIP system. A 486 response generally indicates that the destination is busy, 503 indicates service unavailability, and 200 indicates successful processing. When troubleshooting a 404 response, administrators should examine the dialed address, SIP routing, DNS resolution, dial peers, route patterns, and destination configuration. A SIP trace can identify the system that generated the response and help determine whether the problem originates from routing or destination configuration.

Question 243

Which CUCM feature allows administrators to modify digits before routing a call?

1. Translation Pattern
2. Device Pool
3. Region
4. Media Resource Group

Correct Answer: 1

Explanation

A Translation Pattern allows CUCM to manipulate digits before continuing call processing. Depending on its configuration, it can add, remove, or transform digits to meet enterprise dialing or external network requirements. Translation patterns are especially useful when users dial numbers in one format while gateways or service providers require another format. Device pools provide shared endpoint settings, regions control codec and bandwidth relationships, and media resource groups organize media resources. When troubleshooting incorrect outbound numbers or unexpected destinations, administrators should inspect translation patterns together with route patterns, partitions, Calling Search Spaces, and other digit-manipulation settings.

Question 244

Which SIP method is used to terminate an established SIP session?

1. REGISTER
2. OPTIONS
3. BYE
4. INVITE

Correct Answer: 3

Explanation

The SIP BYE method is used to terminate an established SIP dialog. Once a call has been successfully established, either endpoint can send a BYE request to indicate that the session should end. INVITE is used to establish or modify a session, REGISTER is used to register endpoint information with a SIP registrar, and OPTIONS can query capabilities or availability. During troubleshooting, administrators should examine the SIP signaling sequence to determine which endpoint or intermediary generated the BYE. Unexpected BYE messages may indicate endpoint behavior, trunk issues, routing problems, or intermediary configuration. Understanding SIP methods is essential for analyzing call establishment and termination.

Question 245

Which CUCM configuration provides common settings for a group of IP phones?

1. Device Pool
2. Route Group
3. Partition
4. Translation Pattern

Correct Answer: 1

Explanation

A Device Pool provides common configuration settings to a group of Cisco IP phones and other endpoints. Depending on the deployment, it can reference a CUCM Group, region, date/time group, SRST reference, and other shared settings. Device pools simplify administration because many endpoints can inherit consistent configuration from a single object. Route groups organize gateways, partitions organize dial-plan destinations, and translation patterns manipulate digits. When troubleshooting endpoint behavior, administrators should check the device’s assigned device pool because several important operational settings may be inherited from it. Proper device-pool design improves consistency across locations and endpoint groups.

Question 246

Which protocol is commonly used to synchronize time between Cisco collaboration servers?

1. LDAP
2. NTP
3. RTP
4. SIP

Correct Answer: 2

Explanation

Network Time Protocol, or NTP, is commonly used to synchronize system clocks across Cisco collaboration servers and network devices. Accurate time is important for logging, troubleshooting, authentication, certificate validation, and event correlation. LDAP provides directory services, RTP carries real-time media, and SIP provides signaling. Inconsistent system time can cause difficult-to-diagnose problems, particularly with certificates and security mechanisms. Administrators should ensure that collaboration servers use reliable NTP sources and that time synchronization is functioning correctly. When analyzing distributed call-processing problems, synchronized clocks also make it much easier to correlate events across CUCM, CUBE, Expressway, and other systems.

Question 247

Which component is responsible for providing SIP border functions between an enterprise and an external service provider?

1. Cisco Unity Connection
2. Cisco IM and Presence
3. Cisco Unified Border Element
4. Cisco TFTP

Correct Answer: 3

Explanation

Cisco Unified Border Element, or CUBE, provides SIP border functions between enterprise collaboration systems and external SIP networks. It can perform SIP interworking, header manipulation, topology hiding, media handling, and security-related functions. Unity Connection provides voicemail, IM and Presence provides messaging and presence services, and TFTP supports configuration and firmware distribution for supported endpoints. When external SIP calls fail, administrators should examine CUBE dial peers, SIP signaling, codecs, SIP profiles, NAT, firewall rules, and service-provider requirements. CUBE is an important component for maintaining controlled and interoperable SIP connectivity between an enterprise collaboration environment and external networks.

Question 248

Which CUCM component can contain multiple gateways for use in an ordered routing strategy?

1. Partition
2. Route Group
3. Device Pool
4. Region

Correct Answer: 2

Explanation

A Route Group contains one or more gateways that can be used by CUCM during call routing. Route groups are commonly referenced by Route Lists, allowing administrators to create ordered routing strategies and alternate paths. Partitions organize dial-plan destinations, device pools provide common endpoint configuration, and regions manage codec and bandwidth relationships. If a call is being routed through an unexpected gateway, administrators should trace the call through the route pattern, route list, route group, and gateway configuration. They should also verify gateway availability and any configured routing preferences. Proper route-group design simplifies gateway management and supports redundancy.

Question 249

Which protocol carries real-time media streams such as voice and video?

1. RTP
2. LDAP
3. DNS
4. NTP

Correct Answer: 1

Explanation

Real-time Transport Protocol, or RTP, carries real-time voice and video media between collaboration endpoints and media resources. RTP includes sequence numbers and timestamps that help receivers process media in the correct order and timing. LDAP is used for directory services, DNS provides name resolution, and NTP synchronizes clocks. RTP traffic is sensitive to packet loss, delay, and jitter, making QoS important for collaboration networks. If a call connects but users experience one-way audio, missing media, or poor quality, administrators should investigate the RTP path, routing, firewall policies, NAT, codec negotiation, and endpoint configuration separately from the SIP signaling path.

Question 250

Which Cisco platform provides centralized voicemail functionality for Cisco collaboration users?

1. Cisco CUBE
2. Cisco Expressway
3. Cisco Unity Connection
4. Cisco IM and Presence

Correct Answer: 3

Explanation

Cisco Unity Connection provides centralized voicemail functionality for Cisco collaboration users. It manages mailboxes, greetings, call handlers, message storage, notifications, and voicemail access. CUCM integrates with Unity Connection so calls that are unanswered, busy, or otherwise redirected can reach the appropriate mailbox. CUBE provides SIP border functionality, Expressway provides edge connectivity, and IM and Presence supports instant messaging and presence. If users cannot access voicemail, administrators should inspect CUCM voicemail routing, voicemail ports, Unity Connection integration, mailbox configuration, and network connectivity. Proper integration ensures that users can reliably deposit and retrieve voicemail messages.

Question 251

Which CUCM object defines the gateways that can be selected for a particular outbound call path?

1. Route Group
2. Partition
3. Device Pool
4. Region

Correct Answer: 1

Explanation

A Route Group defines the collection of gateways that CUCM can select for a particular call-routing path. Route groups can contain multiple gateways and are commonly included within route lists. This structure allows administrators to create primary and alternate gateway paths while keeping the dial plan organized. Partitions control destination visibility, device pools provide common endpoint settings, and regions influence media characteristics. During outbound-call troubleshooting, administrators should examine the route pattern first and then follow the routing hierarchy through the route list and route group to the selected gateway. Gateway status and routing preferences should also be reviewed when necessary.

Question 252

Which SIP method is used to initiate a new communication session?

1. OPTIONS
2. INVITE
3. BYE
4. REGISTER

Correct Answer: 2

Explanation

The SIP INVITE method is used to initiate a new communication session. An INVITE can include SDP information describing the media capabilities and parameters proposed by the sender. The receiving endpoint responds with SIP status messages that determine whether the session can be established. BYE terminates an established session, REGISTER provides endpoint registration information, and OPTIONS can be used to query capabilities or availability. When troubleshooting call setup, administrators should inspect the INVITE and subsequent responses to determine whether the request reached the intended destination and whether media negotiation was successful. SIP traces are useful for identifying routing and interoperability issues.

Question 253

Which technology protects RTP media from unauthorized interception and modification?

1. TLS
2. SIP
3. SRTP
4. LDAP

Correct Answer: 3

Explanation

Secure Real-time Transport Protocol, or SRTP, protects RTP-based voice and video media by providing encryption and integrity protection. It is designed specifically for real-time media and helps reduce the risk of unauthorized interception or modification. TLS is generally used to secure signaling connections, SIP provides session signaling, and LDAP provides directory services. In a secure Cisco collaboration deployment, administrators may use TLS for signaling and SRTP for media because these protocols protect different communication components. When secure media fails, administrators should inspect endpoint security capabilities, configured security profiles, negotiation results, and the media path to identify the cause.

Question 254

Which Expressway component is normally deployed at the network edge for Mobile and Remote Access?

1. Expressway-E
2. Expressway-C
3. CUCM
4. Unity Connection

Correct Answer: 1

Explanation

Expressway-E is normally deployed at the network edge in a Mobile and Remote Access architecture. It communicates with Expressway-C through a secure traversal relationship and provides controlled connectivity for remote collaboration clients. Expressway-C is typically located inside the enterprise network and connects toward internal collaboration systems such as CUCM. CUCM provides call processing, while Unity Connection provides voicemail. Troubleshooting MRA commonly requires checking DNS, certificates, traversal zones, search rules, firewall policies, authentication, and CUCM integration. Correct Expressway-E placement helps separate externally reachable services from internal collaboration resources while supporting authorized remote access.

Question 255

Which CUCM object organizes destinations into logical groups that can be searched by a CSS?

1. Route Group
2. Device Pool
3. Partition
4. Media Resource Group

Correct Answer: 3

Explanation

A Partition organizes CUCM dial-plan destinations into logical groups. Directory numbers, route patterns, translation patterns, and other dial-plan objects can be assigned to partitions. A Calling Search Space then determines which partitions a device, line, or user can search. Route groups organize gateways, device pools provide common endpoint settings, and media resource groups organize media resources. If a caller cannot reach a destination, administrators should verify the destination’s partition and the caller’s CSS. Proper partition and CSS design provides control over calling privileges and allows organizations to separate internal, local, long-distance, emergency, and other dialing categories.

Question 256

Which media resource converts one codec into another when endpoints do not share a common codec?

1. Conference Bridge
2. Transcoder
3. Annunciator
4. Music on Hold

Correct Answer: 2

Explanation

A transcoder converts media between different codecs when communicating endpoints cannot establish a mutually supported codec. For example, an endpoint may use G.711 while another network segment requires a different codec. The transcoder performs the necessary conversion so the call can continue. Conference bridges provide multiparty conferencing, annunciators provide system-generated audio prompts, and Music on Hold provides audio during hold conditions. If signaling succeeds but a call fails during media negotiation, administrators should review codec capabilities, region configuration, media resource availability, and MRGL assignments. Proper transcoder configuration supports interoperability across endpoints and networks using different media codecs.

Question 257

Which DNS record type identifies the hostname and port associated with a network service?

1. A
2. CNAME
3. PTR
4. SRV

Correct Answer: 4

Explanation

An SRV record identifies the location of a specific network service and can provide the service target hostname and port. Cisco collaboration environments can use SRV records for service discovery and automatic location of supported services. A records map hostnames to IPv4 addresses, CNAME records provide aliases, and PTR records support reverse DNS lookups. When collaboration clients or systems cannot discover a required service, administrators should verify SRV records, target host records, DNS server reachability, and service availability. Correct DNS configuration is particularly important for distributed collaboration deployments and remote-access architectures that rely on automated service discovery.

Question 258

Which CUCM feature determines which CUCM servers an endpoint uses for registration?

1. CUCM Group
2. Route List
3. Partition
4. Translation Pattern

Correct Answer: 1

Explanation

A CUCM Group defines the ordered list of CUCM servers that endpoints can use for registration and call processing. Device pools reference CUCM Groups, allowing administrators to assign registration and redundancy policies to groups of endpoints. If a preferred server becomes unavailable, the endpoint can use another server according to the configured group and endpoint behavior. Route lists control gateway routing, partitions organize dial-plan destinations, and translation patterns manipulate digits. When troubleshooting registration failures, administrators should inspect the endpoint’s device pool, CUCM Group configuration, server status, network connectivity, TFTP information, and registration state to identify the cause.

Question 259

Which SIP response code indicates successful processing of a request?

1. 404
2. 200
3. 486
4. 503

Correct Answer: 2

Explanation

SIP response code 200 indicates successful processing of a request. A common example is a 200 OK response sent after an INVITE is accepted and the session can proceed. A 404 response indicates that a requested resource was not found, 486 generally indicates a busy destination, and 503 indicates service unavailability. When analyzing SIP signaling, administrators should consider the entire transaction rather than interpreting a single response in isolation. Examining the sequence of requests and responses helps identify whether a call was successfully established, rejected, redirected, or terminated. SIP response-code knowledge is essential for collaboration troubleshooting.

Question 260

Which CUCM configuration provides an ordered collection of route groups for outbound call routing?

1. Route List
2. Region
3. Device Pool
4. Partition

Correct Answer: 1

Explanation

A Route List provides an ordered collection of route groups that CUCM can use for outbound call routing. It allows administrators to define primary and alternate routing paths through different gateway groups. Route patterns can point to route lists, while route groups contain the gateways that ultimately handle the call. Regions control codec and bandwidth relationships, device pools provide common endpoint settings, and partitions organize dial-plan destinations. When troubleshooting outbound routing, administrators should follow the routing hierarchy from the dialed digits through the route pattern, route list, route group, and gateway. This structured approach helps identify incorrect routing and supports resilient gateway design.