MFX Infotech - A Quess Company Desktop Support and Help Desk Engineer Interview Questions, Process, and Tips

OSI (Open Systems Interconnection) model has 7 layers.

• Physical layer

• Data link layer

• Network layer

• Transport layer

• Session layer

• Presentation layer

• Application layer

PST is a file format used by Microsoft Outlook to store email messages, contacts, calendar events, and other data.

• PST stands for Personal Storage Table.

• It is used to store data locally on a computer.

• PST files can be imported and exported to transfer data between different computers or email clients.

• Outlook has a size limit for PST files, which can cause issues if exceeded.

• PST files can be password protected for securit

The network layer is responsible for routing and forwarding data packets between different networks.

• It is the third layer of the OSI model

• It provides logical addressing and routing services

• It determines the best path for data to travel between networks

• Examples of network layer protocols include IP and ICMP

There are 3 types of IP addresses: IPv4, IPv6, and MAC. IPv4 has 4 classes: A, B, C, and D.

• IPv4: 4 classes - A (1.0.0.0 to 126.0.0.0), B (128.0.0.0 to 191.255.0.0), C (192.0.1.0 to 223.255.255.0), D (224.0.0.0 to 239.255.255.255)

• IPv6: 8 groups of 4 hexadecimal digits separated by colons (e.g. 2001:0db8:85a3:0000:0000:8a2e:0370:7334)

• MAC: 6 groups of 2 hexadecimal digits separated by colons (e.g. 00:1B:44:11:3A:B7)

LAN, WAN, and MAN are types of computer networks that differ in their geographical coverage and connectivity.

• LAN (Local Area Network) is a network that covers a small geographical area, such as a home, office, or building.

• WAN (Wide Area Network) is a network that covers a large geographical area, such as a city, country, or even the world.

• MAN (Metropolitan Area Network) is a network that covers a larger geographical ar...read more

Steps to troubleshoot a computer that won't turn on

• Check power source and connections

• Check power button and cables

• Check for any signs of damage or overheating

• Try a different power outlet or power supply

• Check BIOS settings and hardware components

• Consult manufacturer's troubleshooting guide or seek professional help