Use the features in project to report effectively on your plans. Course overview Duration: 4 hours Our Project – Reporting course is aimed at experienced users of Project who need to create reports in their project plans. It looks at using the different types of report in Project, exporting data to other packages, building new reports and sharing reports between projects. Experience of using Project to create and resource plans is required. Objectives By the end of the course you will be able to: Print and PDF data from your project Use timelines Setup filters and groups Import and export data Create and share dashboard reports Content Printing and reporting Setup and Printing Creating PDFs Visual reports Using the Timeline Filtering and grouping Applying filters Applying grouping Creating your own filters and groups Importing and exporting data Importing data into Project Exporting data Creating and saving data maps Dashboard reports Using dashboard reports Creating dashboard reports Adding widgets Customising data shown
Duration 5 Days 30 CPD hours This course is intended for For those seeing to prepare for CCIE Enterprise Infrastructure certification Overview This course will help prepare for CCIE Enterprise Infrastructure certification The new CCIE Enterprise Infrastructure certification program prepares you for today?s expert-level job roles in enterprise infrastructure technologies. CCIE Enterprise Infrastructure now includes automation and programmability to help you scale your enterprise infrastructure. VTP VTP and different versions Pruning EtherChannel LACP Layer 2 and Layer 3 Spanning Protocol 1d, 802.1w, and 802.1s SPAN, RSPAN, and ERSPAN DMVPN All Phases Redundancy: Two Clouds One Hub Two Hubs one Cloud Two hubs two Clouds Running Routing Protocols DMVPN over MPLS EIGRP RD, CD, S, FC, FS, and FD Configuration, and hidden debugging Authentications: MD5, and SHA, Summarization Load Balancing:Equal Cost, Unequal Cost, Add-Path, Filtering, Default Route Injection Optimization: Query Propagation Boundary, IP FRR, STUB routing (All Options) Metric: Classic, Wide Metric Route Tags: Decimal and Dotted-Decimal Notations, OTP OSPFv2 Overview and special cases GRE or Virtual-Links LSAs, FA, and RFCs (1583, 1587, 2328, 3101, 5185 and many more) Best Path Selection Network Types Area Types Optimization: GTSM, LFA, Default Route Injection Authentication: RFC 2328, RFC 5709, Summarization, Filtering BGP States Establishing a Peer Session: Regular method,Peer-Groups,Templates,Best Path Selection Attributes: Weight, AS-Path, Origin, Next-Hop, Local-Preference, Atomic-Aggregate Communities, Aggregator, and MED Load Balancing: Equal Cost,Unequal Cost,Conditional Advertisement,Out/In Bound Route Filtering and the order,ORF,Multihoming Scenarios AS-Path Manipulation: Regexp,Local-as,Allow-as,Remove-Private-as Convergence and Scalability: Route Reflectors,Confederation,Aggregation (All Options) Other BGP Features: MultiPath,Add-Path,Route-Refresh,Soft Reconfiguration IPv6 Acquiring an IPv6 Address: IPv6 General Prefix SLAAC DHCPv6 Rapid-Commit Relay Prefix Delegation IPv6 and DMVPN EIGRPv6 OSPFv3: Both flavors, LSAs, RFCs BGP for IPv6: IPv6 transport, and IPv4 route exchange Transitional Solutions: NAT-PT,6VPE,Multicast,MLD,Static RP,BSR,Embedded RP,IPv6 Traffic Filters,RA Guard,ND Inspection MPLS LDP, VRFs, RD, and RT L3VPNs Route Leaking PE to CE Routing Security Control Plane Policing VACLs Storm Control DHCP Snooping IP Source Guard DAI Private VLANs Port Security Access-lists uRPF Device Tracking IPsec Identity Use Case For FlexVPN: Site-to-Site, IKEv1, and IKEv2 Using Preshared Keys 1x Port Base Authentication : Device Roles,Port States,Authentication Process,Host Modes Network Services FHRP: HSRP, VRRP, and GLBP NAT: Static NAT, and PAT,Dynamic NAT,Policy-Base NAT,VRF-Aware NAT,VASI NAT Software Defined Infrastructure Cisco SD Access: Design a Cisco SD Access solution Underlay network (IS-IS, manual/PnP) Overlay fabric design (LISP, VXLAN, Cisco TrustSec) Fabric domains (single-site and multi-site using SD-WAN transit) Cisco SD Access deployment: Cisco DNA Center device discovery and device management Add fabric node devices to an existing fabric Host onboarding (wired endpoints only) Fabric border handoff Segmentation Macro-level segmentation using VNs Micro-level segmentation using SGTs (using Cisco ISE) Assurance Network and client health (360) Monitoring and troubleshooting Cisco SD-WAN: Design a Cisco SD-WAN solution Orchestration plane (vBond, NAT) Management Plane (vManage) Control Plane (vSmart, OMP) Data Plane (vEdge/cEdge) WAN edge deployment Onboarding new edge routers Orchestration with zero-touch provisioning/PnP OMP TLOC Configuration templates Localized policies (only QoS) Centralized policies Application aware Routing Topologies
The best leaders are able to enable their team and the organisation to fulfil their potential by creating a highly motivational environment. This program will equip you with skills to: Establish and communicate organisational vision and values Lead change and promote innovation Develop effective teams and coach leaders Understand motivation and develop peoples' potential.
Duration 4 Days 24 CPD hours This course is intended for This course is geared for attendees with Intermediate IT skills who wish to learn Computer Vision with tensor flow 2 Overview This 'skills-centric' course is about 50% hands-on lab and 50% lecture, with extensive practical exercises designed to reinforce fundamental skills, concepts and best practices taught throughout the course. Working in a hands-on learning environment, led by our Computer Vision expert instructor, students will learn about and explore how to Build, train, and serve your own deep neural networks with TensorFlow 2 and Keras Apply modern solutions to a wide range of applications such as object detection and video analysis Run your models on mobile devices and web pages and improve their performance. Create your own neural networks from scratch Classify images with modern architectures including Inception and ResNet Detect and segment objects in images with YOLO, Mask R-CNN, and U-Net Tackle problems faced when developing self-driving cars and facial emotion recognition systems Boost your application's performance with transfer learning, GANs, and domain adaptation Use recurrent neural networks (RNNs) for video analysis Optimize and deploy your networks on mobile devices and in the browser Computer vision solutions are becoming increasingly common, making their way into fields such as health, automobile, social media, and robotics. Hands-On Computervision with TensorFlow 2 is a hands-on course that thoroughly explores TensorFlow 2, the brand-new version of Google's open source framework for machine learning. You will understand how to benefit from using convolutional neural networks (CNNs) for visual tasks. This course begins with the fundamentals of computer vision and deep learning, teaching you how to build a neural network from scratch. You will discover the features that have made TensorFlow the most widely used AI library, along with its intuitive Keras interface. You'll then move on to building, training, and deploying CNNs efficiently. Complete with concrete code examples, the course demonstrates how to classify images with modern solutions, such as Inception and ResNet, and extract specific content using You Only Look Once (YOLO), Mask R-CNN, and U-Net. You will also build generative adversarial networks (GANs) and variational autoencoders (VAEs) to create and edit images, and long short-term memory networks (LSTMs) to analyze videos. In the process, you will acquire advanced insights into transfer learning, data augmentation, domain adaptation, and mobile and web deployment, among other key concepts. Computer Vision and Neural Networks Computer Vision and Neural Networks Technical requirements Computer vision in the wild A brief history of computer vision Getting started with neural networks TensorFlow Basics and Training a Model TensorFlow Basics and Training a Model Technical requirements Getting started with TensorFlow 2 and Keras TensorFlow 2 and Keras in detail The TensorFlow ecosystem Modern Neural Networks Modern Neural Networks Technical requirements Discovering convolutional neural networks Refining the training process Influential Classification Tools Influential Classification Tools Technical requirements Understanding advanced CNN architectures Leveraging transfer learning Object Detection Models Object Detection Models Technical requirements Introducing object detection A fast object detection algorithm ? YOLO Faster R-CNN ? a powerful object detection model Enhancing and Segmenting Images Enhancing and Segmenting Images Technical requirements Transforming images with encoders-decoders Understanding semantic segmentation Training on Complex and Scarce Datasets Training on Complex and Scarce Datasets Technical requirements Efficient data serving How to deal with data scarcity Video and Recurrent Neural Networks Video and Recurrent Neural Networks Technical requirements Introducing RNNs Classifying videos Optimizing Models and Deploying on Mobile Devices Optimizing Models and Deploying on Mobile Devices Technical requirements Optimizing computational and disk footprints On-device machine learning Example app ? recognizing facial expressions
Duration 5 Days 30 CPD hours This course is intended for This course is designed primarily for professionals in the following job roles: Collaboration engineers Collaboration administrators Overview After taking this course, you should be able to: Configure Cisco Unity Connection integration Configure and troubleshoot Cisco Unity Connection and Cisco Unity Connection call handlers Configure and troubleshoot Cisco Unity Express Describe SSO for Cisco Unified Communications applications Describe how Cisco Jabber and Cisco Unified Communications Manager IM and Presence are integrated with other Cisco or third-party applications Customize the Cisco Unified Communications Manager IM and Presence and Cisco Jabber functionality Configure and troubleshoot chat rooms and message archiving Troubleshoot Cisco Jabber and Cisco Unified Communications Manager IM and Presence Integrate Cisco Unified Attendant Console Advanced with Cisco Unified Communications Manager and Cisco Unified Communications Manager IM and Presence server Configure call recording and monitoring This course provides you with the knowledge and skills to streamline communication procedures, strengthen compliance measures, and enhance your communication systems and devices with knowledge about Single Sign-On (SSO), Cisco© Unified IM and Presence, Cisco Unity© Connection and Cisco Unity Express. This course will prepare you for certification exam 300-810 Implementing Cisco Collaboration Applications (CLICA). Course Outline Configuring and Troubleshooting Cisco Unity Connection Integration Configuring and Troubleshooting Cisco Unity Connection Call Handlers Troubleshooting Cisco Unity Connection Configuring and Troubleshooting Cisco Unity Express Configuring Single Sign-On (SSO) for Cisco Unified Communications Applications Integrating Cisco Unified Communications Manager IM and Presence and Cisco Jabber Customizing Cisco Unified Communications Manager IM and Presence and Cisco Jabber Functionality Configuring Cisco Unified Communications Manager IM and Presence Service Compliance and Message Archiving Troubleshooting Cisco Unified Communications Manager IM and Presence Service Integrating Cisco Unified Attendant Console Advanced Implementing Call Recording and Monitoring Lab outline Integrate and Set Up Cisco Unity Connection Configure Cisco Unity Connection Call Handlers Implement Toll Fraud Prevention Troubleshoot Cisco Unity Connection Call Handlers Troubleshoot Cisco Unity Connection Configure Cisco Unity Express Troubleshoot Cisco Unity Express Configure Cisco Unified Communications Manager IM and Presence High Availability Implement Cisco Jabber Configure Centralized Cisco Unified Communications Manager IM and Presence Configure Cisco Unified Communications Manager IM and Presence Service Functionality Enable Message Archiving and Chat Rooms Troubleshoot the Cisco Unified Communications IM and Presence Database Connection Troubleshoot Cisco Unified Communications Manager IM and Presence High Availability Troubleshoot Cisco Unified Communications Manager IM and Presence Service Integrate Cisco Unified Attendant Console Advanced Implement Call Recording and Monitoring Using a Switched Port Analyzer (SPAN)-based Solution Implement Cisco Unified Communications Manager Call Recording and Monitoring Additional course details: Nexus Humans Cisco Implementing Cisco Collaboration Applications v1.0 (CLICA) training program is a workshop that presents an invigorating mix of sessions, lessons, and masterclasses meticulously crafted to propel your learning expedition forward. This immersive bootcamp-style experience boasts interactive lectures, hands-on labs, and collaborative hackathons, all strategically designed to fortify fundamental concepts. Guided by seasoned coaches, each session offers priceless insights and practical skills crucial for honing your expertise. Whether you're stepping into the realm of professional skills or a seasoned professional, this comprehensive course ensures you're equipped with the knowledge and prowess necessary for success. While we feel this is the best course for the Cisco Implementing Cisco Collaboration Applications v1.0 (CLICA) course and one of our Top 10 we encourage you to read the course outline to make sure it is the right content for you. Additionally, private sessions, closed classes or dedicated events are available both live online and at our training centres in Dublin and London, as well as at your offices anywhere in the UK, Ireland or across EMEA.
Duration 5 Days 30 CPD hours This course is intended for Change Managers: Responsible for documentation, approval and change processes System Landscape Architects: Responsible for the design of the transport landscape topology System Administrators: Responsible for executing transports Development Managers: Responsible for performing development changes Application Manager: Responsible for approving and performing changes in an application Support Manager and members of the customer's SAP competence center: Responsible for Reporting and Diagnostics capabilities Partners and System Integrators Overview This course will prepare you to: Describe the concept and methods of E2E Change Control Management. Leverage the SAP Solution Manager 7.2 as application platform for E2E Change Control Management. In this course you will learn how change control management coordinates changes that are introduced into a software landscape so that the changes do not conflict with each other and how to make sure the changes are executed without disrupting ongoing business. This results in improved quality of the software landscape, higher availability of IT solutions, and lower total cost of ownership. Also important, change control management ensures that the changes introduced remain transparent, traceable and are made available for reporting and change analysis. Becoming adept at change control management requires skill in the efficient use of standardized methods and procedures. In this ?how to use? training, SAP imparts best-in-class knowledge of solution operations. The End-to-End Change Control Management course introduces participants to what change control management is and the standard tools used to accomplish it, tools provided by SAP Solution Manager. Introduction to E2E Change Control Management Explain the scope of End-to-End Change Control Management Explain the role of SAP Solution Manager to manage changes in your solution landscape Enhanced Change and Transport System Explain how the Enhanced Change and Transport System (CTS+) works Understand the basic concepts of Enterprise Portal and how it is supported by CTS+ Describe the best practices for the setup and usage of CTS+ in different scenarios Configuration Validation Understand the concepts and architecture of E2E Change Diagnostics Find current configuration information with the Change Reporting tool Find recent changes in the solution landscape with the E2E Change Analysis tool Compare multiple systems with the Configuration Validation tool Create targets, use operators and run validation reports Know how to use predefined reports in the report directory Transport and Execution Analysis Service and Transport and Execution Analysis Service for Projects Know how to run and use this self-check services within SAP Solution Manager Understand how to interpret the software change management KPIïs that are collected for your landscape Software Change Strategy Understand the limitations of a three-system landscape Understand the benefits of bundling changes in cycles and synchronized releases Transport Management with SAP Solution Manager Understand the change control landscape concept for transport management in SAP Solution Manager 7.2 Understand the usage of critical objects, cross system object locking and downgrade protection Know how to use retrofit in a dual landscape Understand the features of cCTS, which can be used for Quality Gate Management and Change Request Management parallel to CTS. Quality Gate Management Explain the concept of Solution Transports and Track Synchronization Setup and use Quality Gate Scenario as a central Transport Management Tool Create and release transport requests centrally in SAP Solution Manager for ABAP and Non-ABAP environments Know how to work within the Quality Gate Scenario Change Request Management Understand the different use cases for Change Request Management Describe the various elements of Change Request Management as part of SAP Solution Manager Understand SAP?s best practices for transport management which are implemented in Change Request Management Know how to work with Change Request Management Release Management Learn how to manage Release Management with SAP Solution Manager Understand how to manage the successful deployment of all related changes into the productive environment.
Duration 3 Days 18 CPD hours This course is intended for This course is geared for attendees with Intermediate IT skills who wish to learn Computer Vision with tensor flow 2 Overview This 'skills-centric' course is about 50% hands-on lab and 50% lecture, with extensive practical exercises designed to reinforce fundamental skills, concepts and best practices taught throughout the course. Working in a hands-on learning environment, led by our Computer Vision expert instructor, students will learn about and explore how to Build, train, and serve your own deep neural networks with TensorFlow 2 and Keras Apply modern solutions to a wide range of applications such as object detection and video analysis Run your models on mobile devices and web pages and improve their performance. Create your own neural networks from scratch Classify images with modern architectures including Inception and ResNet Detect and segment objects in images with YOLO, Mask R-CNN, and U-Net Tackle problems faced when developing self-driving cars and facial emotion recognition systems Boost your application's performance with transfer learning, GANs, and domain adaptation Use recurrent neural networks (RNNs) for video analysis Optimize and deploy your networks on mobile devices and in the browser Computer vision solutions are becoming increasingly common, making their way into fields such as health, automobile, social media, and robotics. Hands-On Computervision with TensorFlow 2 is a hands-on course that thoroughly explores TensorFlow 2, the brandnew version of Google's open source framework for machine learning. You will understand how to benefit from using convolutional neural networks (CNNs) for visual tasks. This course begins with the fundamentals of computer vision and deep learning, teaching you how to build a neural network from scratch. You will discover the features that have made TensorFlow the most widely used AI library, along with its intuitive Keras interface. You'll then move on to building, training, and deploying CNNs efficiently. Complete with concrete code examples, the course demonstrates how to classify images with modern solutions, such as Inception and ResNet, and extract specific content using You Only Look Once (YOLO), Mask R-CNN, and U-Net. You will also build generative dversarial networks (GANs) and variational autoencoders (VAEs) to create and edit images, and long short-term memory networks (LSTMs) to analyze videos. In the process, you will acquire advanced insights into transfer learning, data augmentation, domain adaptation, and mobile and web deployment, among other key concepts Computer Vision and Neural Networks Computer Vision and Neural Networks Technical requirements Computer vision in the wild A brief history of computer vision Getting started with neural networks TensorFlow Basics and Training a Model TensorFlow Basics and Training a Model Technical requirements Getting started with TensorFlow 2 and Keras TensorFlow 2 and Keras in detail The TensorFlow ecosystem Modern Neural Networks Modern Neural Networks Technical requirements Discovering convolutional neural networks Refining the training process Influential Classification Tools Influential Classification Tools Technical requirements Understanding advanced CNN architectures Leveraging transfer learning Object Detection Models Object Detection Models Technical requirements Introducing object detection A fast object detection algorithm YOLO Faster R-CNN ? a powerful object detection model Enhancing and Segmenting Images Enhancing and Segmenting Images Technical requirements Transforming images with encoders-decoders Understanding semantic segmentation Training on Complex and Scarce Datasets Training on Complex and Scarce Datasets Technical requirements Efficient data serving How to deal with data scarcity Video and Recurrent Neural Networks Video and Recurrent Neural Networks Technical requirements Introducing RNNs Classifying videos Optimizing Models and Deploying on Mobile Devices Optimizing Models and Deploying on Mobile Devices Technical requirements Optimizing computational and disk footprints On-device machine learning Example app ? recognizing facial expressions
Duration 3 Days 18 CPD hours This course is intended for This course is aimed at anyone who wants to harness the power of data analytics in their organization including: Business Analysts, Data Analysts, Reporting and BI professionals Analytics professionals and Data Scientists who would like to learn Python Overview This course teaches delegates with no prior programming or data analytics experience how to perform data manipulation, data analysis and data visualization in Python. Mastery of these techniques and how to apply them to business problems will allow delegates to immediately add value in their workplace by extracting valuable insight from company data to allow better, data-driven decisions. Outcome: After attending this course, delegates will: Be able to write effective Python code Know how to access their data from a variety of sources using Python Know how to identify and fix data quality using Python Know how to manipulate data to create analysis ready data Know how to analyze and visualize data to drive data driven decisioning across your organization Becoming a world class data analytics practitioner requires mastery of the most sophisticated data analytics tools. These programming languages are some of the most powerful and flexible tools in the data analytics toolkit. From business questions to data analytics, and beyond For data analytics tasks to affect business decisions they must be driven by a business question. This section will formally outline how to move an analytics project through key phases of development from business question to business solution. Delegates will be able: to describe and understand the general analytics process. to describe and understand the different types of analytics can be used to derive data driven solutions to business to apply that knowledge to their business context Basic Python Programming Conventions This section will cover the basics of writing R programs. Topics covered will include: What is Python? Using Anaconda Writing Python programs Expressions and objects Functions and arguments Basic Python programming conventions Data Structures in Python This section will look at the basic data structures that Python uses and accessing data in Python. Topics covered will include: Vectors Arrays and matrices Factors Lists Data frames Loading .csv files into Python Connecting to External Data This section will look at loading data from other sources into Python. Topics covered will include: Loading .csv files into a pandas data frame Connecting to and loading data from a database into a panda data frame Data Manipulation in Python This section will look at how Python can be used to perform data manipulation operations to prepare datasets for analytics projects. Topics covered will include: Filtering data Deriving new fields Aggregating data Joining data sources Connecting to external data sources Descriptive Analytics and Basic Reporting in Python This section will explain how Python can be used to perform basic descriptive. Topics covered will include: Summary statistics Grouped summary statistics Using descriptive analytics to assess data quality Using descriptive analytics to created business report Using descriptive analytics to conduct exploratory analysis Statistical Analysis in Python This section will explain how Python can be used to created more interesting statistical analysis. Topics covered will include: Significance tests Correlation Linear regressions Using statistical output to create better business decisions. Data Visualisation in Python This section will explain how Python can be used to create effective charts and visualizations. Topics covered will include: Creating different chart types such as bar charts, box plots, histograms and line plots Formatting charts Best Practices Hints and Tips This section will go through some best practice considerations that should be adopted of you are applying Python in a business context.
Duration 5 Days 30 CPD hours This course is intended for System architects and system administrators Overview By the end of the course, you should be able to meet the following objectives: Introduce troubleshooting principles and procedures Use command-line interfaces, log files, and the vSphere Client to diagnose and resolve problems in the vSphere environment Explain the purpose of common vSphere log files Identify networking issues based on reported symptoms Validate and troubleshoot the reported networking issue Identify the root cause of networking issue Implement the appropriate resolution to recover from networking problems Analyze storage failure scenarios using a logical troubleshooting methodology identify the root cause of storage failure Apply the appropriate resolution to resolve storage failure problems Troubleshoot vSphere cluster failure scenarios Analyze possible vSphere cluster failure causes Diagnose common VMware vSphere High Availability problems and provide solutions Identify and validate VMware ESXiTM host and VMware vCenter problems Analyze failure scenarios of ESXi host and vCenter problems Select the correct resolution for the failure of ESXi host and vCenter problems Troubleshoot virtual machine problems, including migration problems, snapshot problems, and connection problems Troubleshoot performance problems with vSphere components This five-day training course provides you with the knowledge, skills, and abilities to achieve competence in troubleshooting the VMware vSphere© 8 environment. This course increases your skill level and competence in using the command-line interface, VMware vSphere© Client?, log files, and other tools to analyze and solve problems. Course Introduction Introductions and course logistics Course objectives Introduction to Troubleshooting Define the scope of troubleshooting Use a structured approach to solve configuration and operational problems Apply troubleshooting methodology to logically diagnose faults and improve troubleshooting efficiency Troubleshooting Tools Discuss the various methods to run commands Discuss the various ways to access ESXi Shell Use commands to view, configure, and manage your vSphere components Use the vSphere CLI Use ESXCLI commands from the vSphere CLI Use Data Center CLI commands Identify the best tool for command-line interface troubleshooting Identify important log files for troubleshooting vCenter Server and ESXi Describe the benefits and capabilities of VMware SkylineTM Explain how VMware Skyline works Describe VMware SkylineTM Health Describe VMware Skyline AdvisorTM Troubleshooting Virtual Networking Analyze and troubleshoot standard switch problems Analyze and troubleshoot virtual machine connectivity problems Analyze and troubleshoot management network problems Analyze and troubleshoot distributed switch problems Troubleshooting Storage Discuss the vSphere storage architecture Identify the possible causes of problems in the various types of datastores Analyze the common storage connectivity and configuration problems Discuss the possible storage problems causes Solve the storage connectivity problems, correct misconfigurations, and restore LUN visibility Review vSphere storage architecture and functionality necessary to troubleshoot storage problems Use ESXi and Linux commands to troubleshoot storage problems Analyze log file entries to identify the root cause of storage problems Investigate ESXi storage issues Troubleshoot VM snapshots Troubleshoot storage performance problems Review multipathing Identify the common causes of missing paths, including PDL and APD conditions Solve the missing path problems between hosts and storage devices Troubleshooting vSphere Clusters Identify and troubleshoot vSphere HA problems Analyze and solve vSphere vMotion problems Diagnose and troubleshoot common vSphere DRS problems Troubleshooting Virtual Machines Discuss virtual machine files and disk content IDs Identify, analyze, and solve virtual machine snapshot problems Troubleshoot virtual machine power-on problems Identify possible causes and troubleshoot virtual machine connection state problems Diagnose and recover from VMware Tools installation failures Troubleshooting vCenter Server and ESXi Analyze and solve vCenter Server service problems Diagnose and troubleshoot vCenter Server database problems Use vCenter Server Appliance shell and the Bash shell to identify and solve problems Identify and troubleshoot ESXi host problems