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Your Guide to the Microsoft Lync Server 2013 70-336 Exam

The 70-336 Exam, formally titled Core Solutions of Microsoft Lync Server 2013, was the cornerstone certification for IT professionals specializing in Microsoft's unified communications platform. Passing this exam validated a candidate's ability to design, deploy, configure, and manage a Lync Server 2013 environment. The exam was intended for consultants, network administrators, and IT generalists responsible for the real-time communication infrastructure of an organization, including instant messaging, conferencing, and enterprise voice.

Achieving the certification associated with the 70-336 Exam demonstrated a deep understanding of Lync's architecture and its integration with other core infrastructure services. While Lync Server 2013 has since been succeeded by newer platforms, the fundamental principles of unified communications it embodies are timeless. Concepts such as server roles, DNS-based service location, high availability, and voice routing logic, all tested in the 70-336 Exam, provide an invaluable foundation for anyone working with modern communication technologies like Microsoft Teams.

Core Architecture of Lync Server 2013

Acing the 70-336 Exam requires a solid grasp of the Lync Server 2013 architecture. The environment is built upon a set of specific server roles working in concert. The Front End Server is the heart of Lync; it handles user authentication, presence, instant messaging, and conferencing. User data and state information are stored on a dedicated Back End Server, which is a SQL Server database. This separation of application logic and data is a key architectural design.

For external connectivity, the Edge Server is deployed in a perimeter network (DMZ). It securely relays traffic for remote users, federated partners, and public IM services. For voice connectivity to the public telephone network, the Mediation Server translates signaling and media between Lync and a PSTN Gateway or SIP Trunk. All of these roles are defined and managed through a single, central database known as the Central Management Store (CMS).

Understanding Lync Server Topologies

The 70-336 Exam tests your ability to choose and design the appropriate Lync Server topology based on an organization's needs for scale and availability. For smaller organizations, a Lync Server 2013 Standard Edition deployment was a common choice. A Standard Edition server is an all-in-one box that co-locates the Front End Server, the Back End SQL database (using SQL Express), and the Central Management Store on a single physical or virtual machine. While simple to deploy, it represents a single point of failure.

For larger organizations or those requiring high availability, an Enterprise Edition deployment was necessary. In this model, multiple Front End Servers are grouped into a pool. The user load is distributed across the servers in the pool, and if one server fails, the others can handle its workload. The Enterprise Edition pool relies on a dedicated, highly available SQL Server cluster or mirrored instance for its Back End database, providing a robust and scalable solution.

The Role of Active Directory and DNS

Lync Server 2013 is deeply integrated with Active Directory Domain Services, a critical topic for the 70-336 Exam. Before you can install Lync, you must prepare Active Directory by extending the schema with Lync-specific classes and attributes. All Lync user information, including their SIP address and assigned policies, is stored as attributes on their AD user object. Lync uses this tight integration for authentication and as its primary user directory, eliminating the need for a separate database of users.

Domain Name System (DNS) is equally critical and is the mechanism that allows Lync clients to automatically discover and connect to the correct servers. A Lync deployment requires the creation of numerous DNS records, including A records for each server and, most importantly, SRV (Service Location) records. These SRV records, such as _sipinternaltls._tcp, allow a client to find the Lync Front End pool without being manually configured with a server name.

Navigating the 70-336 Exam Objectives

To prepare effectively for the 70-336 Exam, you must align your studies with the official skills measured by Microsoft. The exam blueprint was organized into several major objective domains. The first, "Design a Lync Server 2013 Topology," tested your ability to plan the server infrastructure, including capacity, high availability, and the critical Edge Server and DNS configurations. This is the architectural foundation of the deployment.

The subsequent domains focused on the practical implementation. "Plan and Configure Lync Features" covered user policies for conferencing, IM, and external access. "Deploy and Configure Lync Server 2013" dealt with the step-by-step process of installation, from preparing Active Directory to deploying clients. Finally, "Manage Operations and Data Resiliency" focused on the ongoing tasks of monitoring, troubleshooting, and backing up the Lync environment.

Key Lync Server Administrative Tools

A candidate for the 70-336 Exam must be proficient with the three primary administrative tools used to manage Lync Server 2013. The first is the Lync Server Control Panel, which is a web-based, graphical user interface (GUI). It provides an intuitive way to perform common administrative tasks like managing users, configuring policies, and viewing the health of the topology. It is the ideal tool for day-to-day administration and for those less comfortable with command-line interfaces.

For more advanced configuration and automation, there is the Lync Server Management Shell. This is an extension of Windows PowerShell that includes hundreds of specific cmdlets for managing every aspect of Lync. For complex tasks or bulk operations, the Management Shell is far more powerful and efficient than the GUI. The third key tool is the Topology Builder, a desktop application used exclusively to design, define, and publish your Lync server topology to the Central Management Store.

The Value of Unified Communications Fundamentals

While the 70-336 Exam focuses on a specific product version, the knowledge it represents is far from obsolete. The principles of enterprise-grade unified communications that you learn while studying for this exam are foundational and highly transferable. The concepts of presence, instant messaging, peer-to-peer and multi-party conferencing, and enterprise voice are the building blocks of all modern collaboration platforms, including Skype for Business and Microsoft Teams.

Understanding how to design a highly available server pool, plan for external access via an Edge Server, and configure complex voice routing logic provides a deep level of technical insight that is valuable even in a cloud-centric world. Many organizations still operate in hybrid environments, and the skills validated by the 70-336 Exam are directly applicable to managing the on-premises components of these deployments.

Planning the Lync Server Infrastructure

A successful Lync Server deployment, and a key knowledge area for the 70-336 Exam, begins with meticulous planning. The first step is to assess the business requirements. This involves determining the number of users who will be enabled for Lync and which workloads they will use. For example, will all users be enabled for enterprise voice, or just a subset? Will there be heavy use of video conferencing? The answers to these questions are critical for capacity planning.

Based on the user numbers and workload requirements, you can then use tools like the Lync Server 2013 Planning Tool to help calculate the required number of servers and their hardware specifications. The planning phase must also address high availability and disaster recovery. This involves deciding between a Standard or Enterprise Edition deployment and planning for site resiliency by deploying a paired Front End pool in a secondary data center.

Using the Topology Builder

The Topology Builder is a unique and essential tool in a Lync Server deployment, and the 70-336 Exam requires you to understand its function intimately. It is important to remember that Topology Builder is a design tool, not an installation wizard. You use it to create a complete definition of your Lync environment before you install a single server. Within the tool, you define your central sites, the server roles that will be deployed at each site (e.g., Front End pools, Edge Servers), and the fully qualified domain names (FQDNs) of each server.

You also use Topology Builder to define the SQL stores for the Back End database, specify file shares, and configure the Simple URLs that users will use to access meetings. Once your entire topology is defined, you "publish" it. This action validates your design and writes the configuration data to the Central Management Store (CMS). This published topology then becomes the blueprint that the installation process on each server will follow.

The Lync Server Deployment Process

The 70-336 Exam expects you to know the correct, sequential process for deploying Lync Server 2013. The first step is to prepare the environment. This involves extending the Active Directory schema and running forest and domain preparation tasks. Once the environment is ready, you install the Lync administrative tools, including Topology Builder, on your first server. You then use Topology Builder to define your entire Lync topology, as described previously, and publish it.

With the topology published to the CMS, you can then proceed to install the Lync Server system on each individual server. The installer on each machine reads the configuration from the central CMS and automatically installs and configures the specific roles that were defined for that server in the topology. The final steps involve requesting and assigning the necessary digital certificates and then starting the Lync services.

Configuring High Availability for Front End Pools

For an Enterprise Edition deployment, providing high availability for the Front End pool is a primary design goal. The 70-336 Exam will test your understanding of how this was achieved in Lync Server 2013. Unlike its predecessors, which relied on hardware load balancers, Lync 2013 introduced a new, distributed architecture for the Front End pool. User data and state information were no longer stored on a single server but were replicated across three Front End Servers in a routing group.

This replication was managed by the underlying Windows Fabric service. This meant that if one Front End Server in the pool failed, the other servers already had a copy of the user data and could seamlessly take over their sessions. While a hardware load balancer was still needed for distributing client traffic to the pool, the core high availability was provided by this resilient, built-in architecture. For the Back End database, high availability was achieved using standard SQL Server technologies like clustering or mirroring.

Designing and Deploying the Edge Server Role

The Edge Server is the gateway between your internal Lync environment and the outside world, making it a critical component for the 70-336 Exam. Its primary purpose is to provide secure access for remote users, to enable federation with other organizations (including public IM providers like Skype), and to allow external users to join conferences. The Edge Server is always deployed in a perimeter network, or DMZ.

The Edge Server role is actually comprised of three distinct services. The Access Edge service handles all SIP signaling traffic. The Web Conferencing Edge service manages data sharing and content for external users in meetings. The A/V Edge service is responsible for securely relaying audio and video media streams. Proper configuration of the Edge Server requires careful planning of network interfaces, firewall rules, and the use of public certificates.

Planning and Configuring DNS for Client Discovery

As previously mentioned, DNS is the backbone of the Lync client sign-in process. The 70-336 Exam requires you to know the specific records needed for a successful deployment. For internal clients, the automatic discovery process relies on an A record for lyncdiscoverinternal.<domain> and a critical SRV record for _sipinternaltls._tcp.<domain>. The SRV record points the client to the FQDN of the Front End pool.

For external clients, the process is similar but uses different DNS records that must be published in your public DNS. These include an A record for lyncdiscover.<domain> and an SRV record for _sip._tls.<domain>. In addition to these discovery records, you need A records for every Lync service, such as the Edge Server interfaces and the reverse proxy used for web services. A misconfigured DNS record is one of the most common causes of client sign-in failures.

Certificate Planning and Management

Lync Server 2013 uses mutual TLS (Transport Layer Security) to encrypt and secure almost all of its SIP communication. This means that having a proper public key infrastructure (PKI) and correctly configured digital certificates is absolutely mandatory. The 70-336 Exam will test your knowledge of Lync's certificate requirements. Most internal server-to-server communication can use certificates issued by an internal enterprise Certificate Authority (CA).

However, for any server that communicates with external clients or federated partners, such as the Edge Server and the reverse proxy, you must use certificates issued by a trusted public CA. Lync makes extensive use of Subject Alternative Name (SAN) certificates, which allow a single certificate to be valid for multiple FQDNs. The Lync certificate wizard helps you to generate the certificate signing request (CSR) with all the required SAN entries for each specific role.

Enabling and Managing Lync Users

Once the Lync Server infrastructure is deployed, the next step is to enable users. The 70-336 Exam requires proficiency in this core administrative task. It is important to remember that Lync users are simply Active Directory user objects with additional Lync-specific attributes. The process of "enabling" a user for Lync involves populating these attributes, most notably the SIP address, and assigning the user to a specific Front End pool.

This can be done through the Lync Server Control Panel, which provides a user-friendly graphical interface for searching for AD users and enabling them one by one. For bulk operations, the Lync Server Management Shell is the preferred tool. Using the Enable-CsUser cmdlet, an administrator can easily script the process of enabling hundreds or thousands of users at once, assigning them the correct SIP address format and registrar pool based on their AD properties.

Understanding Lync Server Policies

Lync Server 2013 uses a comprehensive policy-based model to control the features and capabilities available to users. A deep understanding of this model is essential for the 70-336 Exam. Policies can be created to control nearly every aspect of the user experience, including conferencing policies (what features are allowed in meetings), archiving policies (whether to archive IM conversations), mobility policies (who can use mobile clients), and client version policies (which client versions are allowed to connect).

These policies can be applied at different scopes, creating a flexible hierarchy. A policy can be set at the Global scope (the default for everyone), the Site scope (applies to a specific central site), the Pool scope (applies only to users homed on a specific pool), or a per-user/tag scope (assigned directly to individual users). The most specific policy always wins, allowing for granular control over user entitlements.

Configuring Role-Based Access Control (RBAC)

To delegate administrative tasks without granting excessive permissions, Lync Server 2013 uses a Role-Based Access Control (RBAC) model. This is a key administrative concept for the 70-336 Exam. Lync integrates with Active Directory to use universal security groups to define administrative roles. When Lync is installed, it creates a set of predefined role groups in AD, such as CSAdministrator, CSVoiceAdministrator, CSUserAdministrator, and CSHelpDesk.

Each of these roles has a specific, predefined set of permissions within Lync. For example, a user who is a member of the CSHelpDesk group can search for users and view their configuration but cannot make any changes. A member of the CSVoiceAdministrator group can manage all aspects of enterprise voice but cannot modify general Lync policies. By adding administrative users to these AD groups, you can effectively delegate tasks based on job function.

Deploying and Managing Lync 2013 Clients

The user experience is delivered through the Lync 2013 client, and the 70-336 Exam covers its deployment and management. The client is part of the Microsoft Office suite but can also be installed as a standalone application. In an enterprise environment, the client is typically deployed using standard software distribution tools like System Center Configuration Manager.

Once deployed, the client experience can be managed through a combination of client policies (which are set on the server) and client-side registry keys or group policy objects. Client policies control features like whether file transfer is allowed or the maximum resolution for video calls. The client itself uses the DNS-based autodiscovery process to find the correct Lync server to sign in to, which simplifies the initial configuration for the end-user.

Configuring Lync Mobility Services

Providing a rich experience for mobile users was a key feature of Lync 2013, and its configuration is an important topic for the 70-336 Exam. The Lync Mobile client, available for various mobile operating systems, allows users to access IM, presence, and conferencing on the go. To enable mobility, several server-side components must be configured correctly. The Lync Server Mobility Service (Mcx) runs on the Front End servers and handles the communication with the mobile clients.

External mobile clients connect through the Edge Server and a reverse proxy. The autodiscover service is also critical for mobile clients to find the correct services. A key consideration for mobile devices is push notifications, which are used to alert a user of a new IM or call when the Lync app is not running in the foreground. Lync Server integrates with cloud-based push notification services to deliver these alerts.

Implementing Archiving and Monitoring

For compliance, regulatory, or business intelligence purposes, many organizations need to archive communications and monitor system usage. The 70-336 Exam requires you to understand how to implement these features. The Archiving service in Lync can be enabled to capture and store all instant messaging conversations and conferencing content. This data is stored in a dedicated SQL database. Archiving can be controlled by policies, allowing you to enable it for all users or just for a specific subset.

The Monitoring service captures two types of data: Call Detail Records (CDR) and Quality of Experience (QoE) data. CDRs provide usage information, such as who called whom and for how long. QoE data provides detailed metrics about the quality of audio and video calls, including information on jitter, packet loss, and latency. This data is invaluable for troubleshooting call quality issues and for capacity planning.

The Simple URLs Concept

To make it easy for users to join meetings and for administrators to access the system, Lync 2013 uses the concept of Simple URLs. The 70-336 Exam expects you to know the purpose of these URLs. There are three main Simple URLs that are defined during the initial topology setup. The "Meet" URL is the base URL for all conference links (e.g., meet.company/username/meetingid). The "Dial-In" URL provides a web page where users can find the dial-in phone numbers and conference IDs for meetings.

The third Simple URL is the "Admin" URL, which provides a memorable link to the Lync Server Control Panel (e.g., admin.company). These Simple URLs are configured in Topology Builder and require corresponding A or CNAME records in DNS. They also need to be published through a reverse proxy to be accessible to external users. This feature significantly improves the usability of the Lync conferencing experience.

Introduction to Lync Enterprise Voice

Enterprise Voice is the feature set that allows Lync Server 2013 to deliver a complete Private Branch Exchange (PBX) replacement, enabling users to make and receive calls to and from the Public Switched Telephone Network (PSTN). Mastering the concepts of Enterprise Voice is a significant part of the 70-336 Exam. The core components that enable this functionality are the Mediation Server, which is co-located on the Front End Server, and a connection to the PSTN.

This PSTN connection can be established in two ways. The first is by connecting to a physical PSTN Gateway device, which is a piece of hardware that converts TDM (like ISDN) or analog signals to SIP over IP. The second, more modern method is to connect directly to an Internet Telephony Service Provider (ITSP) via a SIP Trunk. An administrator must understand how to configure Lync to communicate with these different PSTN connectivity options.

The Role of the Mediation Server

The Mediation Server is a critical component in the Enterprise Voice architecture, and its function is a key topic for the 70-336 Exam. Its primary role is to act as a translator or intermediary between the internal Lync environment and the external PSTN world (via a gateway or SIP trunk). It performs two main functions: signaling translation and media transcoding.

For signaling, it translates the SIP protocol used by Lync into the specific SIP profile required by the PSTN gateway or ITSP. For media, the Mediation Server is responsible for transcoding. This means it can convert between different media codecs, for example, converting Lync's preferred RTAudio codec to the G.711 codec commonly used on the PSTN. It also handles the secure transport of media by encrypting and decrypting the Real-time Transport Protocol (RTP) streams.

Planning and Configuring Voice Routing

The logic that determines how an outbound call from a Lync user reaches the PSTN is controlled by a sophisticated set of voice routing configurations. The 70-336 Exam requires you to be an expert in this area. The process begins with a Dial Plan, which is used to normalize dialed phone numbers into a standard E.164 format. Once the number is normalized, Lync checks the user's assigned Voice Policy to see if they are authorized to make that type of call (e.g., local, long distance, international).

The Voice Policy is associated with one or more PSTN Usages, which are simply class-of-service tags. These usages are then linked to specific Routes. Each Route points to a particular PSTN Gateway or SIP Trunk. This multi-layered, policy-based routing provides extremely granular control over how calls are routed and which users are permitted to make different types of calls.

Implementing Call Admission Control (CAC)

In a geographically distributed organization with multiple offices connected by a wide area network (WAN), it is possible for a large number of simultaneous audio or video calls to saturate the limited bandwidth on a WAN link, leading to poor quality for everyone. Call Admission Control (CAC) is the Lync feature designed to prevent this. The 70-336 Exam will test your knowledge of how to configure CAC.

CAC works by tracking the number of active sessions on a constrained network link. An administrator defines network regions, sites, and the bandwidth limits between them. When a user tries to initiate a call that would traverse a bandwidth-constrained link, Lync checks if there is enough available bandwidth. If there is not, the call is either blocked or, if configured, re-routed over the PSTN as a backup path. This ensures that the quality of existing calls is not degraded.

Configuring Response Groups and Call Park

To be a true PBX replacement, Lync must provide common telephony features. The 70-336 Exam covers two of the most important ones: Response Groups and Call Park. The Response Group Service is used to route and queue incoming calls to a designated group of users, known as agents. It is commonly used for internal help desks or small customer service teams. You can configure different routing methods, such as sending the call to all agents at once or finding the agent who has been idle the longest.

The Call Park feature allows a user to place a call on hold in a central "parking lot." The system then gives the user a unique retrieval number. The user, or any other Lync user, can then dial this number from any Lync phone to retrieve the call. This is useful in scenarios where a call needs to be transferred to someone who is not at their desk.

Mastering Lync Conferencing

Lync Server 2013 provides a rich, multi-modal conferencing experience, and the 70-336 Exam requires you to understand its components and configuration. Lync supports conferences that can include instant messaging, audio, video, and web-based content sharing, such as desktop sharing, whiteboarding, and polling. The core conferencing services, including the A/V Conferencing Server, are co-located on the Front End Server.

A key enhancement in Lync 2013 was the integration with the Office Web Apps Server (now known as Office Online Server). This separate server role is used for rendering PowerPoint presentations in conferences. By offloading the PowerPoint rendering to a dedicated server, Lync provides a higher-fidelity presentation experience that is accessible to a wide range of clients, including mobile and web-based attendees.

Configuring Dial-in Conferencing

In addition to joining a meeting from a Lync client, users often need the ability to join the audio portion from a regular telephone. This is known as dial-in conferencing, and its configuration is a key topic for the 70-336 Exam. To enable this, an administrator must first configure a Dial-in Conferencing Access Number. This is a dedicated phone number that users can call to reach the Lync conferencing service.

When a user calls this number, they are greeted by an auto-attendant that prompts them to enter the numeric Conference ID for their meeting. The configuration of dial-in conferencing involves creating the access number, associating it with a specific dial plan, and ensuring that the conferencing policies assigned to users have the dial-in option enabled. This feature is essential for ensuring that attendees can join a meeting from anywhere, even without an internet connection.

Monitoring Lync Server Health and Quality

Ongoing operational management is a critical responsibility for a Lync administrator and a key domain for the 70-336 Exam. Lync Server provides a rich set of tools for monitoring the health of the environment and the quality of the user experience. To proactively check the health of various services, Lync provides a set of PowerShell cmdlets called Synthetic Transactions. These are scripts (e.g., Test-CsUcwaConference) that simulate user actions, like signing in or joining a conference, and report back on their success or failure.

For analyzing real user data, the Monitoring Server reports are the primary tool. These web-based reports allow you to query the Call Detail Record (CDR) and Quality of Experience (QoE) databases. You can use them to find trends in usage, troubleshoot call failures, and drill down into the detailed network metrics of a poor-quality call to identify the root cause, such as high jitter or packet loss.

Troubleshooting Lync Sign-in Issues

One of the most common help desk tickets for a Lync administrator is a user being unable to sign in. The 70-336 Exam expects you to have a methodical approach to troubleshooting this issue. The process should always start with the basics: is the user's SIP address correct? Is their account enabled for Lync? After verifying the user's account, the next step is to check the client's connectivity. The Lync client has a built-in configuration information screen (accessed by Ctrl+right-clicking the Lync icon) that shows which server it is trying to connect to.

This information can help you determine if the issue is with DNS resolution. A misconfigured DNS record is the most frequent cause of sign-in failures. For external users, the Microsoft Remote Connectivity Analyzer is an invaluable web-based tool that can simulate an external client sign-in and provide a detailed report of any DNS, certificate, or firewall issues it encounters.

Troubleshooting Enterprise Voice Call Failures

Troubleshooting Enterprise Voice issues requires a deeper level of technical skill, and this is an important area for the 70-336 Exam. When a user reports that they cannot make or receive a PSTN call, the first step is to understand the call flow. Which dial plan, voice policy, and route should the call be using? You can use the Test-CsVoiceRoute cmdlet to simulate a call to a specific number and see which route Lync would select.

For more complex issues, you will need to capture and analyze logs. The Lync Server Logging Tool allows you to enable detailed tracing for specific components, such as the SIP stack on the Front End or Mediation Server. Once you have captured a trace of the failed call, you can use the Snooper tool to open the log file. Snooper provides a formatted, easy-to-read view of the SIP messages, allowing you to see the exact point where the call failed and the specific error code that was returned.

Managing the Central Management Store (CMS)

The Central Management Store (CMS) is the master database that contains the entire configuration of your Lync topology. Its health and availability are critical. The 70-336 Exam requires you to know how to manage it. The CMS is hosted on the Back End SQL Server of your primary Front End pool. The configuration data is then replicated from this master database to a local read-only copy on each Lync server in the topology.

A key operational task is to monitor the health of this replication. The Get-CsManagementStoreReplicationStatus cmdlet allows you to check if all servers have a recent and up-to-date copy of the configuration. In a disaster recovery scenario where the primary data center is lost, you must perform a CMS failover. This involves a formal process of promoting a database in the secondary data center to become the new master CMS.

Lync Server Backup and Restore Procedures

A robust backup and restore strategy is essential for any enterprise system, and Lync Server is no exception. The 70-336 Exam expects you to know what needs to be backed up. The most critical component is the configuration. The Export-CsConfiguration cmdlet allows you to export the entire Lync topology and policy configuration to a zip file. This should be done regularly and especially before making any major changes.

In addition to the configuration, you need to back up the actual data. This includes the various SQL databases that store user data, conferencing information, and the Archiving and Monitoring data. These can be backed up using standard SQL Server backup procedures. The file shares used for content like meeting presentations also need to be included in your regular file system backups.

High-Level Migration Concepts

While the 70-336 Exam focuses on Lync Server 2013, it is beneficial to have a high-level understanding of how you would migrate to it from a previous version, such as Lync Server 2010. Lync supports a side-by-side migration approach. This involves building a new Lync Server 2013 pool in parallel with the existing Lync 2010 pool. For a period of time, the two environments will coexist and interoperate.

Once the new 2013 environment is fully functional, you can begin moving users from the old pool to the new one. The Move-CsUser cmdlet handles this process seamlessly from the user's perspective. After all users and services have been migrated to the new pool, the old Lync 2010 servers can be decommissioned. This phased approach minimizes downtime and risk during the upgrade process.

Conclusion

The knowledge gained while studying for the 70-336 Exam provides a valuable context for understanding the evolution of Microsoft's unified communications strategy. Lync Server 2013 was succeeded by Skype for Business Server, which built upon the same core architecture but added new features and improved the user experience. Skype for Business Server, in turn, is now being succeeded by Microsoft Teams, which is a cloud-native platform.

However, many of the core on-premises concepts learned for Lync are still highly relevant. The principles of voice routing, PSTN connectivity via SIP trunks, and DNS-based service discovery are fundamental to how Microsoft Teams provides enterprise voice in hybrid environments using Direct Routing. Therefore, the deep technical foundation provided by the 70-336 Exam material remains a significant asset for any professional in the unified communications field.

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