HCLTech Interview Questions, Process, and Tips

SNMP is the protocol used for monitoring network devices.

• SNMP stands for Simple Network Management Protocol

• It is used to manage and monitor network devices such as routers, switches, servers, etc.

• SNMP allows network administrators to collect information about network performance, usage, and errors.

• Examples of SNMP monitoring tools include Nagios, Zabbix, and PRTG Network Monitor.

BGP has four states: Idle, Connect, OpenSent, and Established.

• Idle state is the initial state where BGP waits for a start event.

• Connect state is when BGP tries to establish a TCP connection with the peer.

• OpenSent state is when BGP sends an Open message to the peer.

• Established state is when BGP has successfully established a connection with the peer and can exchange routing information.

• BGP can transition between states ...read more

Recovery mode is a troubleshooting mode in which a device is booted with minimal resources to fix issues.

• Recovery mode is used to fix software issues on devices such as smartphones, tablets, and computers.

• It allows the user to access a limited set of tools and features to diagnose and fix problems.

• In recovery mode, the device may be able to perform tasks such as wiping the cache partition, factory resetting, or install...read more

Firewall is a network security system that monitors and controls incoming and outgoing network traffic.

• Firewall acts as a barrier between a trusted, secure internal network and another network like the Internet.

• It can be hardware, software, or a combination of both.

• Firewall can be configured to allow or block specific traffic based on predefined security rules.

• Examples of firewalls include Cisco ASA, Fortinet FortiGate

To troubleshoot a Mac that is not powering on, start by checking the power source and connections.

• Check if the power source is working properly

• Check if the power cable is properly connected to the Mac

• Try resetting the SMC (System Management Controller)

• Try resetting the PRAM (Parameter RAM)

• Check if there are any hardware issues such as a faulty battery or power supply

• Try booting the Mac in Safe Mode

To reduce/extend size of a lvm partition, use lvresize command.

• Use lvresize command with appropriate options to reduce/extend the size of a lvm partition.

• To reduce the size, use the option --resizefs to resize the file system as well.

• To extend the size, use the option --resizefs only if the file system supports online resizing.

• Example: lvresize --resizefs --size -2G /dev/vg01/lv01 to reduce by 2GB.

• Example: lvresize --r...read more