100+ Ubisoft Entertainment Interview Questions and Answers

VMware HA allows for a maximum of 4 host failures within a cluster. If a 5th host fails, VMs may not restart depending on admission control settings.

• Maximum allowed host failures within a HA cluster is 4

• If a 5th host fails and admission control is enabled, some VMs may not restart due to resource constraints

• If admission control is disabled, VMs will restart on any remaining host but may not be functional

• Ensure enough port groups are configured on vSwitch for Virtual Machine p...read more

Prerequisites for HA clusters in VMware environment

• Virtual machines and configuration files must be on shared storage

• Console network should have redundant network paths for reliable failure detection

• Hosts in cluster must be part of a VMotion network for DRS with HA

Prerequisites for VMotion include network configuration, CPU compatibility, shared storage, and virtual switch restrictions.

• ESX Servers must have VMkernel ports enabled for VMotion on the same network segment

• ESX Servers must be managed by the same Virtual Center server

• ESX Servers must have compatible CPUs

• ESX Servers must have consistent networks and network labels

• VMs must be stored on shared storage like iSCSI, FC SAN, or NAS/NFS

• VMs cannot use local CD/floppy or internal-only...read more

Akamai request flow involves parsing rules in a hierarchical manner.

• Akamai request flow involves multiple stages and rules.

• When a request comes to Akamai, it goes through a series of stages such as Edge server selection, caching, and delivery.

• During each stage, different rules are parsed and applied based on the configuration.

• The hierarchy of rules determines the order in which they are evaluated and applied.

• For example, caching rules may be evaluated before delivery rules.

• Th...read more

The implemented method would be of the interface that is extended first in the class declaration.

• In this case, since class A implements B and C, the implemented method m1 would be of interface B if B is extended first in the class declaration.

• If C was extended first in the class declaration, then the implemented method m1 would be of interface C.

• The order of interface extension determines which interface's method is implemented in the class.

Virtual machine processes may still be visible in the Service Console even when powered down.

• Virtual machine processes may still be running in the background even when the virtual machine is powered down.

• The ps command shows all processes running on the system, including those related to virtual machines.

• Some processes may continue to run for maintenance or monitoring purposes even when the virtual machine is not actively running.

To configure the new LUN in VC, I will follow the given steps and set the block size based on the volume size.

• Add the new LUN to the storage array

• Rescan the storage adapters in vSphere Client

• Create a new datastore using the new LUN ID

• Set the block size based on the volume size (e.g. 1MB for 500GB volume size)

The basic commands to troubleshoot connectivity between vSphere Client/vCenter and ESX server.

• Ping the ESX server from the vSphere Client/vCenter to check network connectivity.

• Check if the ESX server is reachable by using the vmkping command.

• Verify if the ESX server's management services are running using the service mgmt-vmware status command.

• Check the firewall settings on the ESX server to ensure necessary ports are open.

• Restart the management agents on the ESX server using...read more

To create a binary search tree of minimum height from a sorted skewed binary tree, we can use the following approach:

• Find the middle element of the sorted skewed binary tree.

• Make it the root of the new binary search tree.

• Recursively repeat the process for the left and right halves of the original tree.

• Attach the resulting subtrees as the left and right children of the root.

Function to print permutations of elements from arraylists with no duplicates.

• Use recursion to generate all possible permutations by selecting one element from each arraylist at a time.

• Keep track of used elements to avoid duplicates in the permutation sets.

• Use a set data structure to store and check for duplicates efficiently.

Adding a new VLAN to a production network involves several steps and enabling it requires configuration changes.

• Plan the new VLAN configuration including VLAN ID, subnet, and gateway.

• Configure the switch or router to create the new VLAN.

• Assign ports to the new VLAN as needed.

• Enable routing between the new VLAN and other VLANs if required.

• Test the new VLAN to ensure connectivity and functionality.

• Examples: VLAN 20 with subnet 192.168.20.0/24 and gateway 192.168.20.1.

• Examples: ...read more

Connecting ESX host through VC and vSphere involves different services and port numbers.

• Connecting ESX host through VC involves vCenter Server which provides centralized management and monitoring.

• Connecting ESX host through vSphere involves vCenter Server along with additional services like vSphere Client and vSphere Web Client.

• Some of the services involved in connecting ESX host through VC and vSphere include vCenter Server, vSphere Client, vSphere Web Client, and ESXi host ...read more

The command to restart SSH, NTP, and VMware Web access is service.

• To restart SSH, use the command: service ssh restart

• To restart NTP, use the command: service ntp restart

• To restart VMware Web access, use the command: service vmware-webaccess restart

Check if a Binary Tree formed from a Post order traversal array is a Binary Search Tree.

• Start by constructing the Binary Tree from the given Post order traversal array.

• Check if the Binary Tree satisfies the properties of a Binary Search Tree.

• Use recursion to check if each node's value is within the correct range.

• Example: Post order traversal array [1, 3, 2] forms a Binary Search Tree.

• Example: Post order traversal array [3, 2, 1] does not form a Binary Search Tree.

The default number of ports configured with the Virtual Switch is 8.

• The Virtual Switch is a software-based network switch that allows virtual machines to communicate with each other and with the host system.

• By default, the Virtual Switch is configured with 8 ports, which can be used to connect virtual machines and other network devices.

• These ports can be assigned to different virtual machines or network adapters as needed.

• Additional ports can be added or existing ports can be...read more

Possible reasons for not being able to connect to the Service Console over the network.

• Check network connectivity and ensure the correct IP address is being used.

• Verify firewall settings to allow access to the Service Console.

• Ensure the Service Console service is running properly.

• Check for any network configuration issues or restrictions.

• Restart the Service Console and try connecting again.

To reset the root password of the Service Console, you can follow these steps:

• Restart the system and press 'e' at the GRUB menu to edit the boot configuration

• Locate the line starting with 'linux' and append 'init=/bin/bash' at the end

• Press 'Ctrl + X' to boot into single-user mode

• Remount the root file system as read-write by running 'mount -o remount,rw /'

• Reset the root password by running 'passwd root'

• Reboot the system and login with the new root password

It is not possible to create a balanced B tree from an unsorted array in logarithmic complexity.

• Creating a balanced B tree from an unsorted array requires sorting the array first, which has a complexity of O(n log n).

• Balanced B tree construction typically has a complexity of O(n log n) or O(n) depending on the algorithm used.

• Example: If we have an unsorted array [3, 1, 4, 1, 5, 9, 2, 6, 5], we would need to sort it first before constructing a balanced B tree.

ISOs are important because they provide a set of standards and guidelines for various industries.

• ISOs ensure consistency and quality in products and services.

• ISOs help organizations meet legal and regulatory requirements.

• ISOs promote international trade by harmonizing standards across countries.

• ISOs enhance customer confidence and trust in products and services.

• ISOs facilitate interoperability and compatibility between different systems.

• ISOs cover a wide range of areas such a...read more

An efficient algorithm in Java to compare two strings.

• Use the equals() method to compare two strings for equality.

• Consider using compareTo() method for comparing strings lexicographically.

• Handle null strings separately to avoid NullPointerException.

• Use equalsIgnoreCase() method for case-insensitive comparison.

The command to restart SSH, NTP, and VMware Web access is service.

• To restart SSH, use the command 'service ssh restart'

• To restart NTP, use the command 'service ntp restart'

• To restart VMware Web access, use the command 'service vmware-webaccess restart'

MAC layer protocols are used for communication between devices in a network.

• Ethernet (IEEE 802.3)

• Wi-Fi (IEEE 802.11)

• Bluetooth (IEEE 802.15.1)

• Token Ring (IEEE 802.5)

• Zigbee (IEEE 802.15.4)

Virtual machines communicate with other servers in a network through various networking protocols and technologies.

• Virtual machines use network adapters to connect to the network.

• They can communicate with other servers using IP addresses and domain names.

• Virtual machines can send and receive data packets over the network using protocols like TCP/IP or UDP.

• They can establish connections with other servers using protocols like HTTP, FTP, SSH, etc.

• Virtual machines can also commu...read more

Akamai client reputation has pros and cons in CDN services.

• Pros: Improved security by blocking malicious clients, reduced network congestion, enhanced content delivery performance.

• Cons: Potential false positives leading to blocking legitimate clients, reliance on reputation data accuracy, additional complexity in managing reputation rules.

• Example: Akamai client reputation can help prevent DDoS attacks by blocking known malicious IP addresses, improving overall network securit...read more

To troubleshoot a slow connection problem, start by checking the network infrastructure, analyzing network traffic, and testing connectivity.

• Check the network infrastructure for any hardware or software issues

• Analyze network traffic using tools like Wireshark to identify any bottlenecks or anomalies

• Test connectivity by pinging various network devices and checking for packet loss

• Check for any bandwidth limitations or congestion on the network

• Investigate the performance of DNS ...read more

Transport layer protocols facilitate the reliable transmission of data between network devices.

• Transmission Control Protocol (TCP) is a connection-oriented protocol that ensures reliable delivery of data.

• User Datagram Protocol (UDP) is a connectionless protocol that provides faster but less reliable transmission.

• Internet Control Message Protocol (ICMP) is used for network error reporting and diagnostic functions.

• Real-Time Transport Protocol (RTP) is commonly used for streamin...read more

FTP (File Transfer Protocol) is a standard network protocol used for transferring files between a client and a server.

• FTP works by establishing a connection between a client and a server, allowing the client to upload or download files.

• Prerequisites for using FTP include a client FTP software, a server with FTP capabilities, and valid credentials for accessing the server.

• The default port used for FTP is 21, but it can be configured to use other ports for security reasons.

The Service Console port is used for managing and configuring the network settings of a device.

• The Service Console port provides access to the device's management interface.

• It allows administrators to remotely configure and monitor the device.

• The port is typically used for tasks such as setting up network parameters, managing security settings, and troubleshooting.

• It can also be used for firmware updates and accessing diagnostic tools.

• Examples of devices with Service Console ...read more

Akamai CDN is a distributed network that delivers web content efficiently by caching it on servers located closer to end users.

• Akamai CDN uses a network of servers distributed globally to cache and deliver web content.

• When a user requests content, Akamai's intelligent routing system directs the request to the nearest server.

• The server delivers the cached content to the user, reducing latency and improving performance.

• Akamai CDN also provides security features like DDoS protec...read more

ARP protocol is used to map IP addresses to MAC addresses on a local network.

• ARP stands for Address Resolution Protocol.

• It is used to resolve IP addresses to MAC addresses on a local network.

• ARP is essential for communication between devices on the same network.

• Example: When a device wants to communicate with another device on the same network, it uses ARP to find the MAC address corresponding to the IP address.

Virtual base classes are used in C++ to resolve the problem of multiple inheritance and diamond problem.

• Virtual base classes are used when a class is derived from multiple classes and there is a possibility of multiple instances of a base class.

• It helps in avoiding the ambiguity caused by multiple inheritance.

• Virtual base classes are declared using the 'virtual' keyword in the base class declaration.

• They are typically used in scenarios where a derived class needs to access a ...read more

Vmotion is cool because it allows live migration of virtual machines without downtime.

• Vmotion enables seamless migration of virtual machines between physical servers.

• It eliminates the need for planned downtime during server maintenance or upgrades.

• Vmotion ensures high availability and continuous operation of virtualized environments.

• It allows workload balancing and resource optimization across the infrastructure.

• With Vmotion, virtual machines can be moved across different dat...read more

A hypervisor is a software or hardware component that enables the virtualization of computer hardware.

• A hypervisor allows multiple operating systems to run on a single physical machine.

• It provides a layer of abstraction between the physical hardware and the virtual machines.

• There are two types of hypervisors: Type 1 (bare-metal) and Type 2 (hosted).

• Examples of hypervisors include VMware ESXi, Microsoft Hyper-V, and KVM.

Prerequisites for VC and Update Manager

• VC (Virtual Center) requires a Windows Server OS and a supported database server

• Update Manager requires vCenter Server and a Windows Server OS

• Both require compatible hardware and software versions

VMKernel is a component of VMware ESXi that manages the virtualization layer and provides services for virtual machines.

• VMKernel is responsible for managing the CPU, memory, storage, and networking resources of virtual machines.

• It acts as a bridge between the hardware and the virtual machines, allowing them to run efficiently and securely.

• VMKernel provides features like memory management, device drivers, virtual networking, and virtual storage.

• It enables the hypervisor to sch...read more

Virtual functions allow for dynamic polymorphism and runtime binding in object-oriented programming.

• Virtual functions enable the implementation of polymorphism, where a derived class can be treated as its base class.

• They allow for late binding, meaning the appropriate function implementation is determined at runtime based on the actual object type.

• Virtual functions provide a way to override base class methods in derived classes, allowing for customization and specialization.

• T...read more

2-D dynamic array allocation syntax involves using double pointers to allocate memory for an array of strings.

• Use double pointers to allocate memory for rows and columns

• Example: char **array = (char **)malloc(rows * sizeof(char *));

• Allocate memory for each row: array[i] = (char *)malloc(columns * sizeof(char));