📞 Collaboration Infrastructure - CLCOR Practice Questions

Study Cisco Unified Communications Manager (CUCM), Expressway, IM&P, Unity Connection, and collaboration endpoint deployment.

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1Exam Domains

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CLCOR Infrastructure Question Bank (13 Questions)

Browse all 13 practice questions covering Collaboration Infrastructure for the CLCOR certification exam. Each question includes the full answer and a detailed explanation to help you understand the concepts.

  1. Question 1Protocols, Codecs, and Endpoints

    Which security protocol encrypts SIP signaling between CUCM and IP phones or SIP trunks?

    AIPsec
    BTLS (Transport Layer Security)✓
    CSSH
    DMACsec
    Show Answer & Explanation
    Correct Answer: B
    Explanation:

    TLS encrypts SIP signaling (SIP over TLS, port 5061) between CUCM and endpoints/trunks. CUCM uses certificates for authentication and AES encryption for confidentiality. SRTP separately encrypts the media (RTP) stream.

  2. Question 2Infrastructure

    What is the primary function of Cisco Expressway in a collaboration architecture?

    ATo replace CUCM for call processing
    BTo provide secure firewall traversal for remote and mobile collaboration endpoints✓
    CTo store recorded calls
    DTo manage wireless networks
    Show Answer & Explanation
    Correct Answer: B
    Explanation:

    Cisco Expressway provides secure firewall traversal for SIP/H.323 signaling and media, enabling remote workers and mobile users to register to CUCM and use collaboration services without requiring a traditional VPN connection.

  3. Question 3Protocols, Codecs, and Endpoints

    Which Cisco endpoint series is designed for executive desks with a large touchscreen for video calling and collaboration?

    ACisco IP Phone 7800 Series
    BCisco Desk Pro / Board Pro✓
    CCisco ATA 190
    DCisco IP Phone 6800 Series
    Show Answer & Explanation
    Correct Answer: B
    Explanation:

    Cisco Desk Pro and Board Pro are premium endpoints with large touchscreens, built-in cameras, and Webex integration for video collaboration. The 7800/6800 series are standard audio-only IP desk phones.

  4. Question 4Infrastructure

    What is the Expressway-C and Expressway-E architecture used for?

    AQoS policy enforcement
    BExpressway-C (inside) and Expressway-E (outside) work together for secure firewall traversal of collaboration traffic✓
    CRedundant power supply for phones
    DDatabase backup
    Show Answer & Explanation
    Correct Answer: B
    Explanation:

    Expressway-C (inside the firewall) and Expressway-E (in the DMZ) form a traversal pair. They use a secure traversal zone connection to relay SIP/H.323 signaling and media through firewalls without opening inbound ports.

  5. Question 5Infrastructure

    What is the primary role of Cisco Unified Communications Manager (CUCM) in a collaboration deployment?

    ATo provide voicemail services
    BTo serve as the call processing and signaling controller for IP phones and other endpoints✓
    CTo route internet traffic
    DTo provide wireless access point management
    Show Answer & Explanation
    Correct Answer: B
    Explanation:

    CUCM is the central call processing component that handles call setup, routing, and signaling (SIP/SCCP/H.323) for IP phones, softphones, video endpoints, and gateways in a Cisco collaboration deployment.

  6. Question 6Call Control

    What is the purpose of a SIP trunk in CUCM?

    ATo register IP phones
    BTo establish SIP signaling connections between CUCM and external systems like CUBE, other clusters, or SIP providers✓
    CTo provide music on hold
    DTo assign extension numbers
    Show Answer & Explanation
    Correct Answer: B
    Explanation:

    A SIP trunk in CUCM defines a SIP signaling connection to an external entity — CUBE (for PSTN access), another CUCM cluster, Expressway, or a SIP service provider. It specifies the destination address, SIP profile, and security settings.

  7. Question 7Cisco IOS XE Gateway and Media Resources

    What is SIP normalization used for on CUBE or CUCM?

    AConverting SIP to H.323
    BModifying SIP headers and message content to resolve interoperability issues between different SIP implementations✓
    CCompressing SIP messages for bandwidth savings
    DEncrypting SIP messages
    Show Answer & Explanation
    Correct Answer: B
    Explanation:

    SIP normalization uses Lua scripts or built-in profiles to modify SIP headers (Via, Contact, Route, From, To, etc.) and message bodies to resolve interoperability issues between different SIP implementations and providers.

  8. Question 8Infrastructure

    What protocol does a Cisco IP Phone use to download its configuration file from CUCM?

    AFTP
    BTFTP or HTTP/HTTPS✓
    CSCP
    DSMTP
    Show Answer & Explanation
    Correct Answer: B
    Explanation:

    Cisco IP Phones download their configuration files (SEP<MAC>.cnf.xml) and firmware from CUCM using TFTP (legacy) or HTTP/HTTPS (modern/secure). The phone obtains the TFTP/HTTP server address via DHCP Option 150 or DNS.

  9. Question 9Call Control

    What advantage does SIP URI dialing provide in CUCM?

    AIt eliminates the need for IP phones
    BIt allows calling using email-like addresses (user@domain.com) instead of phone numbers✓
    CIt encrypts all calls automatically
    DIt reduces bandwidth usage
    Show Answer & Explanation
    Correct Answer: B
    Explanation:

    SIP URI dialing enables users to place calls using email-like addresses (alice@company.com) instead of phone numbers. This simplifies inter-cluster and B2B calling and aligns with modern unified communications addressing.

  10. Question 10Protocols, Codecs, and Endpoints

    In SIP, how do two endpoints agree on which codec to use for a call?

    ACUCM forces a specific codec on both endpoints
    BThe calling endpoint offers codecs in the SDP body; the called endpoint selects from the offered list✓
    CCodecs are randomly assigned
    DDNS determines the codec
    Show Answer & Explanation
    Correct Answer: B
    Explanation:

    SIP uses the offer/answer model (RFC 3264): the caller's INVITE contains an SDP offer listing supported codecs in preference order. The callee's 200 OK contains an SDP answer selecting the preferred common codec.

  11. Question 11Infrastructure

    Which protocol is used for call signaling between Cisco Unified Communications Manager (CUCM) and Cisco IP phones?

    AH.323
    BSCCP (Skinny Client Control Protocol)✓
    CMGCP
    DXMPP
    Show Answer & Explanation
    Correct Answer: B
    Explanation:

    SCCP (Skinny) is Cisco's proprietary signaling protocol between CUCM and Cisco IP phones, handling call setup, features, and phone registration. SIP is the alternative open standard.

  12. Question 12Call Control

    What determines which destinations a phone can reach in CUCM call routing?

    AIP subnet
    BCalling Search Space (CSS) assigned to the phone/line✓
    CPhone model
    DDHCP scope
    Show Answer & Explanation
    Correct Answer: B
    Explanation:

    The CSS defines an ordered list of Partitions that the phone can search when dialing. If a pattern is not in any Partition within the CSS, the call is blocked.

  13. Question 13Call Control

    Which CUCM feature allows a phone to assume the user's profile (speed dials, directory number) regardless of which physical phone they use?

    AShared Line Appearance
    BExtension Mobility✓
    CSoftkey Template
    DDevice Mobility
    Show Answer & Explanation
    Correct Answer: B
    Explanation:

    Extension Mobility allows users to log into any phone and receive their personal settings (line appearances, speed dials, services), providing hot-desking capability.

Key Infrastructure Concepts for CLCOR

cucmexpresswayimpunityendpointphonesipcollaboration

CLCOR Infrastructure Exam Tips

Collaboration Infrastructure questions in CLCOR are typically scenario-based. Focus on service-level decision making aligned to official exam objectives. Priority concepts: cucm, expressway, imp, unity, endpoint, phone.

What CLCOR Expects

  • Anchor your answer in select the most practical, secure, and scalable answer for the stated scenario.
  • Infrastructure scenarios for CLCOR are frequently mapped to Domain 1 (25%), so read the objective carefully before picking controls or architecture.
  • Expect multi-service scenarios where Infrastructure interacts with IAM, networking, storage, or observability patterns rather than appearing as an isolated service question.
  • When two options are both technically valid, prefer the choice that best aligns with the exam's operational scope (Professional) and managed-service best practices.

High-Value Infrastructure Concepts

  • Know the core Infrastructure building blocks cold: cucm, expressway, imp, unity.
  • Review the edge-case features and limits for endpoint, phone; these details are commonly used to differentiate answer choices.
  • Practice service-integration reasoning: how Infrastructure pairs with Call Control, Applications in real deployment patterns.
  • For CLCOR, explain why the chosen Infrastructure design meets reliability, security, and cost expectations better than the alternatives.

Common CLCOR Traps

  • Watch for answers that partially solve the requirement but miss operational constraints.
  • Questions in Infrastructure often include distractors that look correct for Infrastructure but violate least-privilege, durability, or availability requirements.
  • Avoid picking options purely by feature name; validate data path, failure handling, and governance impact before answering.
  • If the prompt hints at automation or repeatability, eliminate manual-only operational answers first.

Fast Review Checklist

  • Can you compare at least two Infrastructure implementation paths and justify which one best fits the scenario?
  • Can you map the chosen answer back to Infrastructure (25%) outcomes for CLCOR?
  • Can you explain security and access boundaries for Infrastructure without relying on default-open assumptions?
  • Can you describe how Infrastructure integrates with Call Control and Applications during failure, scaling, and monitoring events?

Exam Domains Covering Infrastructure

Domain 1Infrastructure25%

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