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10+ NexGen Tech Solutions Interview Questions and Answers

Updated 25 Apr 2024

Q1. How to assign IP in RHEL 7 Through Command Line and GUI

Ans.

IP can be assigned in RHEL 7 through both command line and GUI.

  • Command Line: Use 'nmcli' command to assign IP address, subnet mask, gateway and DNS server.

  • GUI: Go to 'Settings' -> 'Network' -> select the interface -> click on the gear icon -> select 'IPv4' or 'IPv6' tab -> assign IP address, subnet mask, gateway and DNS server.

  • To verify the IP address, use 'ip addr show' command in the terminal.

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Q2. How check IP in Linux operating system through command line and GUI

Ans.

Learn how to check IP in Linux through command line and GUI

  • To check IP through command line, use the command 'ifconfig' or 'ip addr show'

  • To check IP through GUI, go to network settings and look for the IP address

  • To check public IP, use the command 'curl ifconfig.me' or 'curl icanhazip.com'

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Q3. 1-Difference between UDP and TCP.

Ans.

UDP is a connectionless protocol that provides no guarantee of delivery, while TCP is a connection-oriented protocol that ensures reliable delivery.

  • UDP is faster and more efficient for streaming data, while TCP is better for applications that require reliable data transmission.

  • UDP does not establish a connection before sending data, while TCP does.

  • UDP does not provide error checking or correction, while TCP does.

  • Examples of UDP applications include video streaming and online ...read more

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Q4. How to configure VLAN

Ans.

VLAN configuration involves creating and assigning VLANs to switch ports.

  • Identify the VLANs needed and assign VLAN IDs

  • Configure the switch ports to be members of the appropriate VLANs

  • Configure VLAN trunks to allow VLAN traffic to pass between switches

  • Configure VLAN interfaces for inter-VLAN routing

  • Test and verify the VLAN configuration

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Q5. How to Configure YUM.

Ans.

YUM can be configured by editing the configuration files located in /etc/yum.repos.d/ directory.

  • Edit the .repo files in /etc/yum.repos.d/ directory to add or remove repositories

  • Use the yum-config-manager command to enable or disable repositories

  • Configure proxy settings in /etc/yum.conf file

  • Set the cached package expiration time in /etc/yum.conf file

  • Use the exclude option in /etc/yum.conf file to exclude specific packages from being updated

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Q6. What is router & Routing

Ans.

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.

  • Routing is the process of selecting the best path for data to travel through a network.

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Q7. Difference between structure and Union. Structure is stored in a contigous memory location while union is stored on a shared memory location.Union will take the highest data member memory and it will be allocat...

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Ans.

Structure is stored in a contiguous memory location while union is stored on a shared memory location.

  • Structure allocates memory for each member separately, while union shares the same memory for all members.

  • Structures are used when each member needs its own memory space, while unions are used when only one member is accessed at a time.

  • Example: struct Person { char name[50]; int age; }; union Data { int num; float value; };

  • Accessing different members of a structure will not a...read more

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Q8. Difference between static and auto variable with same name. Static variable is stored in data section where as auto variable is stored in stack section.So if static variable get incremented,it will take place i...

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Ans.

Static variables are stored in data section, while auto variables are stored in stack section. Incrementing a static variable updates its value in the data section, while incrementing an auto variable updates its value in the stack section.

  • Static variables have a lifetime of the entire program, while auto variables have a limited scope within a function.

  • Static variables retain their value between function calls, while auto variables are reinitialized each time the function is...read more

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Q9. What is VLAN

Ans.

VLAN stands for Virtual Local Area Network and is a method of dividing a physical network into multiple logical networks.

  • VLANs are used to improve network performance, security, and management.

  • Each VLAN has its own broadcast domain, which reduces network congestion.

  • VLANs can be configured based on port, MAC address, or protocol.

  • VLAN tagging is used to identify which VLAN a packet belongs to.

  • Examples of VLANs include separating guest and employee networks in a hotel or creatin...read more

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Q10. What is ping

Ans.

Ping is a network utility used to test the connectivity between two devices on a network.

  • Ping sends a small packet of data to a specific IP address or hostname.

  • It measures the time it takes for the packet to travel to the destination and back.

  • Ping is commonly used to troubleshoot network connectivity issues.

  • It can also be used to determine the latency or delay in network communication.

  • Ping can be run from the command line on most operating systems.

  • Example: 'ping google.com' w...read more

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Q11. What is Switch.

Ans.

A switch is a networking device that connects devices together on a local area network (LAN).

  • Switches operate at the data link layer of the OSI model.

  • They use MAC addresses to forward data between devices.

  • Switches can improve network performance by reducing collisions and increasing bandwidth.

  • Examples of switches include Cisco Catalyst, HP ProCurve, and Netgear ProSafe.

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Q12. What is gateway

Ans.

A gateway is a network node that serves as an entrance to another network.

  • It acts as a bridge between two different networks

  • It can be a hardware or software-based solution

  • It can perform various functions such as routing, filtering, and translating data

  • Examples include routers, firewalls, and proxy servers

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Q13. Difference between L2 and L3

Ans.

L2 and L3 are different layers in network architecture. L2 is data link layer and L3 is network layer.

  • L2 operates on MAC addresses while L3 operates on IP addresses

  • L2 is responsible for error-free transmission of data frames while L3 is responsible for routing and forwarding of packets

  • Examples of L2 protocols include Ethernet and Wi-Fi while examples of L3 protocols include IP and ICMP

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