VVDN Technologies Interview Questions and Answers

Services in Angular are reusable pieces of code that can be injected into components or other services to provide functionality.

• Services are singleton objects in Angular, meaning they are instantiated only once during the lifetime of an application.

• They are used to encapsulate logic that is not specific to a particular component, such as data fetching, logging, or authentication.

• Services can be injected into components...read more

Map and filter functions are used in JavaScript to manipulate arrays by transforming elements or filtering based on a condition.

• Map function applies a function to each element in an array and returns a new array with the results.

• Example: let numbers = [1, 2, 3]; let squaredNumbers = numbers.map(num => num * num); // [1, 4, 9]

• Filter function creates a new array with elements that pass a certain condition.

• Example: let nu...read more

ARP stands for Address Resolution Protocol. It is used to map IP addresses to MAC addresses on a local network.

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

• ARP works by broadcasting a request for the MAC address of a specific IP address on the network.

• Yes, ARP entries can be deleted using the 'arp -d' command.

• ARP entries have a timeout period, typically around 2 minutes, after which they are ...read more

DHCP stands for Dynamic Host Configuration Protocol, used to automatically assign IP addresses to devices on a network.

• DHCP is a network protocol that allows a server to automatically assign IP addresses to devices on a network.

• It helps in reducing the manual effort required to configure IP addresses for each device.

• DHCP servers maintain a pool of IP addresses and lease them to devices for a specific period of time.

• Dev...read more

TCP (Transmission Control Protocol) and UDP (User Datagram Protocol) are two different protocols used for data transmission over networks.

• TCP is a connection-oriented protocol that ensures reliable and ordered delivery of data packets.

• UDP is a connectionless protocol that does not guarantee delivery or order of packets.

• TCP uses handshaking to establish a connection between sender and receiver before data transfer.

• UDP i...read more

VLAN stands for Virtual Local Area Network, used to logically segment a network into multiple virtual networks.

• VLANs help in improving network security by isolating traffic between different departments or groups.

• They can also help in optimizing network performance by reducing broadcast traffic.

• VLANs are configured at the switch level and allow devices in different VLANs to communicate with each other based on routing ...read more

STP stands for Software Test Plan. It is a document that outlines the testing strategy, objectives, resources, and schedule for a software testing project.

• STP defines the scope, approach, resources, and schedule of testing activities.

• It helps in identifying the test environment, test deliverables, and test execution schedule.

• STP also includes the roles and responsibilities of the testing team members.

• It serves as a roa...read more

To check network connectivity speed, use tools like speedtest.net. Debug by checking for network congestion or hardware issues. Increase frame size by adjusting MTU. Capture frames using tools like Wireshark.

• Use tools like speedtest.net to check network connectivity speed

• Debug by checking for network congestion, hardware issues, or misconfigured settings

• Increase frame size by adjusting Maximum Transmission Unit (MTU)

• Ca...read more

Layer2 and Layer3 are network layers in the OSI model, responsible for data transmission and routing.

• Layer2 (Data Link Layer) operates at the MAC address level, handling physical addressing and error detection.

• Layer3 (Network Layer) operates at the IP address level, handling routing and logical addressing.

• Layer2 switches operate at Layer2, while routers operate at Layer3.

• Examples of Layer2 protocols include Ethernet an...read more

ICMP stands for Internet Control Message Protocol. It is used for network troubleshooting and diagnostic purposes.

• ICMP is a protocol used by network devices to communicate error messages or operational information.

• Ping is a tool that uses ICMP to send echo requests to a target host and waits for an echo reply.

• Ping works by sending an ICMP echo request packet to the target host, which then responds with an echo reply if...read more

RIP is a distance vector routing protocol while OSPF is a link-state routing protocol. OSPF uses Dijkstra algorithm for routing.

• RIP stands for Routing Information Protocol and OSPF stands for Open Shortest Path First.

• RIP uses hop count as the metric for path selection while OSPF uses cost.

• OSPF is more scalable and efficient than RIP as it converges faster and supports VLSM.

• OSPF uses areas to divide the network into sma...read more

Cisco switches are known for their reliability, advanced features, and high price point compared to other company switches.

• Cisco switches are known for their high quality and reliability.

• Cisco switches offer advanced features such as VLAN support, QoS, and security options.

• Cisco switches are typically more expensive than switches from other companies.

• White box switches are generic, off-the-shelf switches that are not b...read more

SONIC cards are a type of prepaid card used for making purchases at SONIC Drive-In restaurants.

• Prepaid cards used at SONIC Drive-In restaurants

• Can be used to pay for food and drinks

• Can be reloaded with funds as needed

Python program to move all zeros to the end of a list while maintaining the order of non-zero elements.

• Iterate through the input list and separate non-zero elements into one list and zeros into another list.

• Concatenate the non-zero list with the zero list to get the desired output.

• Print the final list with zeros at the end.

Print a pattern of stars in a pyramid shape.

• Use nested loops to print spaces and stars in the desired pattern.

• Start with one star at the top and increase the number of stars in each row.

• Adjust the spacing to create the pyramid shape.

I am a dedicated Junior Engineer with a strong background in production and a proven track record of successfully implementing process improvements.

• Bachelor's degree in Mechanical Engineering

• Experience in optimizing production processes to increase efficiency

• Proficient in CAD software for designing production layouts

• Implemented a new scheduling system that reduced production downtime by 20%

To fix a mistake, I analyze the root cause, take responsibility, communicate with stakeholders, and implement a solution.

• Analyze the root cause of the mistake to understand what went wrong

• Take responsibility for the mistake and acknowledge it to relevant parties

• Communicate with stakeholders to keep them informed about the situation

• Implement a solution to rectify the mistake and prevent it from happening again

• Example: I...read more

I take full responsibility for my mistake in not double-checking the production schedule, resulting in a delay in delivery.

• Acknowledge the mistake without making excuses

• Explain what went wrong and how it could have been prevented

• Discuss steps taken to rectify the mistake and prevent it from happening again

Prioritizing self-care is essential for maintaining overall well-being and gaining perspective in life.

• Make time for activities that bring you joy and relaxation, such as reading, exercising, or spending time with loved ones.

• Practice mindfulness and self-reflection to understand your emotions and thoughts better.

• Set boundaries to protect your mental and physical health, such as saying no to additional work when you're ...read more