Enterprise Support Engineer
10+ Enterprise Support Engineer Interview Questions and Answers
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Q1. What is the OSI layer and explain the work of each layer.
OSI (Open Systems Interconnection) layer is a conceptual model that describes the communication functions of a telecommunication system.
Layer 1 (Physical Layer) - Transmits raw data bits over a communication channel.
Layer 2 (Data Link Layer) - Provides error-free transfer of data frames between nodes over the physical layer.
Layer 3 (Network Layer) - Provides logical addressing and routing of data packets between nodes on different networks.
Layer 4 (Transport Layer) - Provides...read more
Q2. What is the difference between L2 and L3 layer?
L2 is data link layer responsible for MAC addressing and error detection, while L3 is network layer responsible for IP addressing and routing.
L2 operates on MAC addresses while L3 operates on IP addresses
L2 is responsible for error detection and correction while L3 is responsible for routing
L2 switches packets within a network while L3 routes packets between networks
Examples of L2 devices include switches and bridges while examples of L3 devices include routers and layer 3 sw...read more
Q3. what are the main four pillars of oops
Encapsulation, Inheritance, Polymorphism, Abstraction
Encapsulation: Bundling data and methods that operate on the data into a single unit
Inheritance: Ability of a class to inherit properties and behavior from another class
Polymorphism: Ability to present the same interface for different data types
Abstraction: Hiding the complex implementation details and showing only the necessary features
Q4. which is connection oriented udp or tcp
TCP is connection-oriented, while UDP is connectionless.
TCP establishes a connection before sending data, ensuring reliable delivery.
UDP does not establish a connection and does not guarantee delivery.
TCP is used for applications like web browsing, email, and file transfer.
UDP is used for real-time applications like video streaming and online gaming.
Q5. What is JVM and JDK ?
JVM stands for Java Virtual Machine, which is a virtual machine that enables a computer to run Java programs. JDK stands for Java Development Kit, which is a software development kit used to develop Java applications.
JVM is responsible for executing Java bytecode and translating it into machine code.
JDK includes tools for developing, debugging, and monitoring Java applications.
JDK contains JRE (Java Runtime Environment) which includes JVM, libraries, and other necessary compo...read more
Q6. What is VLAN ?
VLAN stands for Virtual Local Area Network. It is a logical grouping of devices on a network based on their function, project, or application.
VLANs allow network administrators to segment a network into smaller, more manageable groups.
Each VLAN has its own broadcast domain, which means that broadcasts are contained within the VLAN and do not spread to other VLANs.
VLANs can be configured to span multiple switches, allowing devices in different physical locations to be grouped ...read more
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Q7. what do you know about os
Operating System (OS) is a software that manages computer hardware and provides services for computer programs.
OS controls hardware resources like memory, CPU, and storage.
It provides a user interface for interacting with the computer.
Examples of OS include Windows, macOS, and Linux.
Q8. what is meant by https and ftp
HTTPS is a secure protocol for transferring data over the internet, while FTP is a protocol for transferring files between a client and a server.
HTTPS stands for Hypertext Transfer Protocol Secure
It encrypts data to ensure secure communication between a client and a server
Commonly used for secure online transactions, such as online banking or shopping
FTP stands for File Transfer Protocol
It allows for the transfer of files between a client and a server
Often used for uploading ...read more
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Q9. What is router?
A router is a networking device that forwards data packets between computer networks.
Routers operate at the network layer of the OSI model.
They use routing tables to determine the best path for data to travel.
Routers can connect different types of networks, such as LANs and WANs.
Examples of routers include Cisco, Juniper, and TP-Link.
Routers can provide security features such as firewalls and VPNs.
Q10. What is subnetting ?
Subnetting is the process of dividing a network into smaller subnetworks.
Subnetting helps in efficient utilization of IP addresses.
It improves network performance and security.
Subnetting is done by borrowing bits from the host portion of an IP address.
CIDR notation is used to represent subnet masks.
Example: 192.168.1.0/24 represents a network with 256 IP addresses.
Q11. What is heap memory ?
Heap memory is a region of a computer's memory that is used for dynamic memory allocation.
Heap memory is allocated at runtime and can be accessed randomly.
It is used for storing objects and data structures that need to be dynamically allocated and deallocated.
Heap memory is managed by the programmer and not automatically by the system.
Examples of heap memory usage include creating objects in Java using the 'new' keyword or allocating memory using malloc() in C.
Q12. 7 layers of networking
The 7 layers of networking refer to the OSI model, which is a conceptual framework used to understand how networks operate.
Physical Layer: Deals with physical connections and hardware (e.g. cables, switches)
Data Link Layer: Manages data transfer between devices on the same network (e.g. MAC addresses)
Network Layer: Handles routing and forwarding of data packets (e.g. IP addresses)
Transport Layer: Ensures reliable data transfer between end systems (e.g. TCP)
Session Layer: Mana...read more
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