Hitachi Energy Senior Associate Consultant Interview Questions and Answers

A firewall is a network security system that monitors and controls incoming and outgoing network traffic based on predetermined security rules.

• Firewalls can be hardware or software-based

• They act as a barrier between a trusted internal network and untrusted external network

• Firewalls can block or allow traffic based on IP addresses, ports, protocols, or applications

• Examples of firewalls include Cisco ASA, Palo Alto Netwo

Switches are devices used to connect multiple devices in a network and direct data packets to the appropriate destination.

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

• They use MAC addresses to forward data to the correct port.

• Switches improve network performance by reducing collisions and segmenting traffic.

• Examples of switches include Cisco Catalyst switches and Juniper EX switches.

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 packets to reach their destination.

• Routing involves selecting paths in a network along which to send network traffic.

• Routers can connect different types of networks, such as LANs and WANs.

• Examples of routers include Cisco r