B. H. Gardi College of Engineering & Technology Interview Questions, Process, and Tips

LAN stands for Local Area Network, a network that connects computers and devices within a limited area such as a home, office, or school.

• LAN is a network that covers a small geographic area, typically within a single building or campus.

• LAN allows connected devices to share resources such as files, printers, and internet access.

• LAN can be wired (Ethernet) or wireless (Wi-Fi).

• Examples of LAN technologies include Ethernet

WAN stands for Wide Area Network, a network that covers a broad area and connects multiple LANs.

• WAN is used to connect geographically dispersed locations, such as different offices of a company.

• It typically uses public infrastructure like the Internet or leased lines.

• Examples of WAN technologies include MPLS, Frame Relay, and ATM.

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

• Acts as a barrier between a trusted internal network and untrusted external network

• Filters network traffic based on rules set by the administrator

• Can be hardware-based or software-based

• Examples include Cisco ASA, Palo Alto Networks, and pfSense

NAC stands for Network Access Control, a security solution that enforces policies for devices connecting to a network.

• NAC verifies the identity of users and devices before allowing access to the network.

• It can restrict access based on security posture, location, and other factors.

• Examples of NAC solutions include Cisco ISE, Aruba ClearPass, and ForeScout CounterACT.

IPSec stands for Internet Protocol Security, a protocol suite used to secure Internet Protocol (IP) communications.

• IPSec provides secure communication by authenticating and encrypting each IP packet in a data stream.

• It operates at the network layer, ensuring data integrity, confidentiality, and authentication.

• IPSec can be used to create Virtual Private Networks (VPNs) for secure remote access or site-to-site connection