10+ NexGen Tech Solutions Interview Questions and Answers

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.

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'

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

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

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

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.

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

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

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

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

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.

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