Thoughtsol Infotech NOC Engineer Interview Questions, Process, and Tips

DNS stands for Domain Name System. It is a decentralized system that translates domain names into IP addresses.

• DNS is used to resolve domain names to IP addresses.

• It works by querying DNS servers to find the IP address associated with a domain name.

• The DNS process involves recursive and iterative queries.

• DNS caching is used to improve performance and reduce network traffic.

• DNS records like A, CNAME, MX, etc., store inf...read more

DHCP stands for Dynamic Host Configuration Protocol. It is a network protocol that enables devices to obtain IP addresses automatically.

• DHCP is used to assign IP addresses to devices on a network.

• The DHCP process involves four steps: discovery, offer, request, and acknowledgement.

• During the discovery phase, a device sends a broadcast message to find a DHCP server.

• The DHCP server responds with an offer, providing an ava...read more

Network architecture refers to the design and layout of a computer network.

• It includes the physical components of the network such as routers, switches, and cables.

• It also includes the logical components such as protocols and network topologies.

• The architecture should be designed to meet the needs of the organization and provide efficient and secure communication.

• Examples of network architectures include client-server,...read more

RAID stands for Redundant Array of Independent Disks. It is a data storage technology that combines multiple physical disk drives into a single logical unit.

• RAID provides improved performance, fault tolerance, and data protection.

• There are different RAID levels, each with its own advantages and disadvantages.

• RAID 0 offers improved performance but no redundancy, while RAID 1 provides redundancy but no performance improv...read more

Routing protocols are sets of rules that determine how routers communicate with each other to forward data packets across networks.

• Routing protocols are used to exchange routing information between routers.

• They help routers to build and maintain routing tables.

• There are two types of routing protocols: interior gateway protocols (IGPs) and exterior gateway protocols (EGPs).

• Examples of IGPs include OSPF and EIGRP, while

RIP, OSPF, EIGRP, and BGP are all routing protocols used in networking.

• RIP is a distance-vector protocol that uses hop count as its metric.

• OSPF is a link-state protocol that uses cost as its metric.

• EIGRP is a hybrid protocol that uses both distance-vector and link-state characteristics.

• BGP is an exterior gateway protocol used for routing between different autonomous systems.

• RIP and OSPF are used within a single autonom...read more

OSI model is a conceptual model that characterizes and standardizes the communication functions of a telecommunication or computing system.

• OSI stands for Open Systems Interconnection.

• It has 7 layers: Physical, Data Link, Network, Transport, Session, Presentation, and Application.

• Each layer has a specific function and communicates with adjacent layers.

• Example: HTTP operates at the Application layer, while TCP operates a...read more

TCP/IP model is a networking protocol that defines how data is transmitted over the internet.

• TCP/IP model has four layers: application, transport, internet, and network access.

• Each layer has its own set of protocols and functions.

• The application layer is responsible for user interaction, while the network access layer deals with physical data transmission.

• TCP/IP model is used for communication between devices on the in...read more

Data link layer is responsible for transferring data between adjacent network nodes and detecting errors in transmission.

• Data link layer is the second layer of the OSI model.

• It provides a reliable link between two devices over a physical layer.

• It is responsible for framing, error detection and correction, flow control, and access control.

• Examples of data link layer protocols include Ethernet, Wi-Fi, and PPP.

• Data link l

Configuring Outlook involves setting up email accounts, server settings, and security options.

• Open Outlook and click on File

• Click on Add Account and enter your email address

• Enter your password and follow the prompts to complete setup

• Configure server settings such as incoming and outgoing mail servers

• Set up security options such as encryption and authentication

• Test the account to ensure it is working properly

OST and PST are file extensions used by Microsoft Outlook to store email data.

• OST stands for Offline Storage Table and is used for storing email data when Outlook is in offline mode.

• PST stands for Personal Storage Table and is used for storing email data on the user's computer.

• OST files are created automatically when Outlook is configured to use Cached Exchange Mode.

• PST files can be created manually by the user to stor...read more

Routers connect different networks, switches connect devices within a network, and hubs connect devices to a network.

• Routers operate at the network layer and use IP addresses to forward packets between networks.

• Switches operate at the data link layer and use MAC addresses to forward frames within a network.

• Hubs operate at the physical layer and simply broadcast data to all connected devices.

• Routers can provide security...read more

An operating system (OS) is a software that manages computer hardware and software resources and provides common services for computer programs.

• OS acts as an interface between the user and the computer hardware.

• It manages the computer's memory and processes.

• Examples of OS include Windows, macOS, Linux, Android, and iOS.

Active Directory (AD) is a Microsoft service that manages network resources and user accounts.

• AD is used to authenticate and authorize users and computers in a Windows domain network.

• It stores information about users, groups, computers, and other network resources.

• AD enables administrators to manage network resources from a central location.

• It provides a hierarchical structure for organizing network resources.

• AD can be...read more

SSH is a secure protocol for remote access while Telnet is an unsecured protocol.

• SSH encrypts data while Telnet sends data in plain text.

• SSH uses public-key cryptography while Telnet uses username and password authentication.

• SSH is more secure and recommended over Telnet.

• SSH uses port 22 while Telnet uses port 23.

• SSH is used for remote access to servers while Telnet is mostly used for testing network connectivity.

HDD is a traditional spinning hard drive, while SSD is a newer, faster type of drive that uses flash memory.

• HDD uses spinning disks to read/write data, while SSD uses flash memory chips.

• SSD is faster and more reliable than HDD.

• SSD is more expensive than HDD.

• SSD consumes less power than HDD.

• SSD has no moving parts, making it less prone to physical damage.

• HDD has larger storage capacity than SSD.

• SSD is commonly used in l...read more

WDS is a Windows Deployment Services used for network-based installation of Windows OS. MDT is a Microsoft Deployment Toolkit used for customizing and automating Windows OS deployment.

• WDS is used for network-based installation of Windows OS

• MDT is used for customizing and automating Windows OS deployment

• WDS is a component of Windows Server

• MDT is a standalone tool that can be used with WDS or other deployment tools

Topology refers to the arrangement of nodes and connections in a network. Types include bus, star, ring, mesh, and hybrid.

• Topology defines the physical or logical layout of a network.

• Bus topology connects all devices to a single cable.

• Star topology connects devices to a central hub or switch.

• Ring topology connects devices in a circular loop.

• Mesh topology connects devices with multiple redundant paths.

• Hybrid topology co...read more

To share a printer in a network, you need to set up printer sharing and configure the necessary settings.

• Connect the printer to a computer that will act as the print server

• Enable printer sharing on the computer

• Configure the printer settings on the print server

• Add the shared printer to other computers on the network

• Test the printer to ensure it is working properly

To access others' computers on our PC within a single network, we can use remote desktop tools like Remote Desktop Protocol (RDP) or Virtual Network Computing (VNC).

• Remote Desktop Protocol (RDP) allows accessing Windows-based computers remotely.

• Virtual Network Computing (VNC) enables remote access to computers running various operating systems.

• Both RDP and VNC require the target computer to have the necessary software ...read more

The latest router and switch used in the market are Cisco Catalyst 9000 Series switches and Cisco ASR 9000 Series routers.

• Cisco Catalyst 9000 Series switches are known for their advanced security features and programmability.

• They offer high performance and scalability for enterprise networks.

• Cisco ASR 9000 Series routers provide high-density, high-performance routing and are suitable for service provider networks.

• They ...read more

Configuring routers and switches involves setting up network protocols, IP addresses, VLANs, and security features.

• Access the router/switch CLI through console or SSH.

• Configure basic settings like hostname, domain name, and passwords.

• Set up IP addresses and subnet masks on interfaces.

• Enable routing protocols like OSPF or BGP for routers.

• Create VLANs and assign ports to them on switches.

• Implement security features like ...read more

VLAN stands for Virtual Local Area Network. It is used to logically segment a network into smaller broadcast domains.

• VLANs are created by configuring network switches.

• Devices in the same VLAN can communicate with each other as if they are on the same physical network.

• VLANs can improve network performance and security by reducing broadcast traffic and isolating network traffic.

• VLANs can be used to group devices by depar...read more

NAT/PAT stands for Network Address Translation/Port Address Translation. It is used to translate private IP addresses to public IP addresses and vice versa.

• NAT/PAT is used to conserve public IP addresses by allowing multiple devices to share a single public IP address.

• It provides security by hiding the internal IP addresses of a network from the external network.

• NAT translates the private IP addresses of devices in a l...read more

IP stands for Internet Protocol. It is a set of rules that governs the format of data sent over the internet.

• IP is responsible for routing data packets between devices on a network.

• There are two versions of IP: IPv4 and IPv6.

• IPv4 uses 32-bit addresses and can support up to 4.3 billion unique addresses.

• IPv6 uses 128-bit addresses and can support an almost infinite number of unique addresses.

• IP is a layer 3 protocol in t...read more

The difference between color coding of 568A and 568B is the arrangement of the wire pairs in the Ethernet cable.

• 568A uses a different order for the green and orange wire pairs compared to 568B.

• 568A: white-green, green, white-orange, blue, white-blue, orange, white-brown, brown

• 568B: white-orange, orange, white-green, blue, white-blue, green, white-brown, brown

• Both standards are used for Ethernet connections, but 568B is...read more

Straight cables are used to connect different types of devices, while cross cables are used to connect similar devices.

• Straight cables are used to connect a computer to a switch, router, or hub.

• Cross cables are used to connect two computers directly or to connect two switches or hubs together.

• Straight cables have the same wiring sequence on both ends, while cross cables have a different wiring sequence on each end.

• Stra...read more