Exam 74-335 - Lync Network Readiness Assessment
Skills measured
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Implement Lync network readiness assessment methodology
- Identify methodology phases
- Order the phases, identify entry and exit criteria, Discovery, Modeling, Simulation, and Recommendation
- Define duration and scope of methodology phases
- Customers’ geographical profiles, number of customers’ sites tested, internal customers’ processes, and customers’ requirements
- Identify deliverables
- Bandwidth calculator, final presentation, and final report
- Prepare for traffic simulation
- Assess technical requirements of synthetic transaction tools, determine appropriate timing of simulations, and gather potential blockers for simulation
Analyze the network environment
- Review WAN topology
- MPLS (Multiprotocol Label Switching), virtual private network (VPN), multiple MPLS providers, asymmetric links, point-to-point wireless, internal NAT, TCP versus UDP, and signaling versus media traffic
- Review Wi-Fi infrastructure
- Access point roaming, rogue AP, controller placement, and channel overlap
- Review QoS approaches
- Traffic policing and traffic shaping impact on RTC, DSCP, and port based, scavenger class and best effort traffic class, and separate/converged networks
- Analyze media flow scenarios
- Conference, peer-to-peer, PSTN, and capture traces
- Analyze the network for optimal performance
- Max jitter, average jitter, peak consecutive packet loss, average packet loss, and one-way network delay
- Monitor and manage networks
- Utilization, managing policy enforcement, monitoring tools, evaluating network availability, and interpreting SNMP traps
Perform usage modeling
- Model RTC traffic media flows
- Peer-to peer, conferencing, and PSTN
- Model Lync traffic per location
- Predict service needs and growth, compare how different personas impact network requirements, and calibrate usage models based on customer usage and business requirements, including audio conferencing, PSTN, and web conferencing
- Calculate traffic volume by using the Lync bandwidth calculator
- Peer-to-peer, PSTN, conferencing, branch traffic, central site traffic, and remote user traffic
- Analyze how predicted traffic impacts a network
- Adjust business requirements, adjust network components (topology, capacity), and limit traffic volume or modify solution design
Analyze customer data and measurements
- Analyze policies collected from the discovery phase
- Existing Service Level Agreements (SLAs) on network infrastructure, analyzing impact of security policies, including firewalls, VPN tunnels, remote access, Direct Access, NAT, and Private VLANs, and assess appropriateness of current QoS policies for Lync
- Analyze historical data network usage
- Average usage, peak usage, average drop, and peak packet loss
- Plan simulation traffic
- Design synthetic transaction endpoint placement/location, design synthetic transaction path, and design synthetic transaction volume per path
- Analyze results from traffic simulation
- Interpret baseline network characteristics and any variations, including analyzing simulation results in the context of a network (topology, quality of service)
- Formulate recommendations
- Recommend network reconfigurations, recommend modifications for QoS approach, and explain impact of observed network impairments