10+ Network Support Engineer L1 Interview Questions and Answers

Routers work with firewalls, access lists, switching, BGP, SSH, Telnet, DHCP, and DNS to manage network traffic and connectivity.

• Routers use access lists to control traffic flow and enforce security policies.

• Switching allows routers to forward packets to their intended destinations.

• BGP is a routing protocol used to exchange routing information between different networks.

• SSH and Telnet are protocols used to remotely access and manage routers.

• DHCP servers assign IP addresses to...read more

OSI model is a conceptual model that characterizes and standardizes the communication functions of a telecommunication or computing system. Transport layer is responsible for end-to-end communication between applications.

• OSI model has 7 layers: Physical, Data Link, Network, Transport, Session, Presentation, and Application.

• Transport layer provides reliable and sequential delivery of data between end systems.

• It ensures error-free data transmission, flow control, and congestion...read more

VLAN is a logical grouping of devices on a network, while trunk is a link that carries multiple VLANs. Switch configuration involves setting up VLANs and trunks on a switch.

• VLAN separates broadcast domains and improves network performance

• Trunk allows multiple VLANs to be carried over a single link

• Switch configuration involves assigning ports to VLANs, configuring VLAN interfaces, and setting up trunk links

• Example: VLAN 10 for finance department, VLAN 20 for marketing departme...read more

Different types of operating systems include Windows, macOS, and Linux. OS installation involves booting from installation media and following on-screen prompts.

• Types of OS include Windows, macOS, and Linux

• To install OS, boot from installation media (CD, USB)

• Follow on-screen prompts to select language, partition disk, and install OS

• Examples: Installing Windows 10 from a USB drive, Installing macOS Catalina from a DVD

The network layer is responsible for logical addressing and routing of data packets across different networks.

• Network layer is the third layer of the OSI model.

• It provides logical addressing to devices on the network.

• IP (Internet Protocol) is a commonly used protocol at this layer.

• Routing protocols like OSPF and BGP operate at this layer.

• Network layer devices include routers and layer 3 switches.

DNS stands for Domain Name System. It translates domain names to IP addresses to locate resources on the internet.

• DNS is like a phone book for the internet, translating domain names to IP addresses.

• It helps users access websites by translating human-readable domain names (e.g. google.com) to machine-readable IP addresses (e.g. 172.217.3.206).

• DNS works through a hierarchical system of servers, with the top-level servers containing information about the root domain names.

• DNS qu...read more

Code to check if a given string is a palindrome in Java

• Create a function that takes a string as input

• Use two pointers, one starting from the beginning and one from the end, to compare characters

• If all characters match, the string is a palindrome

Common processor types in laptops include Intel Core i3, i5, i7, and i9, as well as AMD Ryzen series.

• Intel Core i3, i5, i7, i9

• AMD Ryzen series

Amazon EC2 (Elastic Compute Cloud) is a web service that provides resizable compute capacity in the cloud.

• Virtual servers in the cloud

• Pay-as-you-go pricing model

• Scalable and flexible computing resources

• Supports various operating systems and applications

OSPF (Open Shortest Path First) is a routing protocol used to find the best path for data packets in IP networks.

• OSPF is a link-state routing protocol

• It uses Dijkstra's algorithm to calculate the shortest path

• OSPF routers exchange link-state advertisements (LSAs) to build a topology database

• It supports VLSM (Variable Length Subnet Masking) and CIDR (Classless Inter-Domain Routing)

• OSPF is widely used in large enterprise networks and ISPs

A MAC address is a unique identifier assigned to network interfaces for communications on a network.

• MAC stands for Media Access Control

• It is a 48-bit address typically written as six groups of two hexadecimal digits separated by colons or hyphens

• MAC addresses are used to uniquely identify devices on a network

• Example: 00:1A:2B:3C:4D:5E

Subnetting is the process of dividing a network into smaller subnetworks to improve performance and security.

• Subnetting helps in optimizing network resources and improving security by creating smaller, more manageable networks.

• It involves dividing an IP network into subnets based on specific criteria such as geographical location, department, or function.

• Subnetting allows for better organization of network devices and more efficient routing of network traffic.

• For example, a n...read more