NOC Support Engineer L1 Interview Questions and Answers

OSI layers are a conceptual model for communication systems. SPT stands for Session, Presentation, and Transport layers.

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

• Session layer manages communication sessions between devices.

• Presentation layer handles data formatting and encryption.

• Transport layer ensures reliable data transfer between devices.

• SPT layers are Session, Presentation, and Transport layers.

• Understanding O...read more

IP addressing is a method used to assign unique numerical labels to devices on a network, while subnetting involves dividing a network into smaller subnetworks.

• IP addressing is used to uniquely identify devices on a network using a series of numbers separated by periods (e.g. 192.168.1.1).

• Subnetting involves dividing a larger network into smaller subnetworks to improve performance and security.

• Subnet masks are used to determine which part of an IP address is the network porti...read more

VLAN, STP, VTP, and EtherChannel are networking concepts used to manage and optimize network traffic.

• VLAN (Virtual Local Area Network) divides a physical network into multiple virtual networks to improve performance and security.

• STP (Spanning Tree Protocol) prevents loops in Ethernet networks by blocking redundant paths.

• VTP (VLAN Trunking Protocol) manages VLAN configurations across a network to ensure consistency.

• EtherChannel combines multiple physical links into a single lo...read more

Networking is the practice of connecting computers and other devices to share resources and information.

• Networking involves the physical connection of devices through cables or wireless signals.

• It also includes the configuration of devices to communicate with each other using protocols like TCP/IP.

• Networking allows for sharing resources such as files, printers, and internet connections.

• Examples of networking devices include routers, switches, and access points.

The OSI model is a conceptual framework that standardizes the functions of a telecommunication or computing system into seven layers.

• The OSI model stands for Open Systems Interconnection model.

• It helps in understanding how data is transferred over a network.

• Each layer has specific functions and interacts with adjacent layers.

• Examples of layers include physical layer, data link layer, network layer, transport layer, etc.

DNS stands for Domain Name System, which translates domain names to IP addresses.

• DNS is like a phone book for the internet, translating human-readable domain names (like google.com) to IP addresses (like 172.217.3.206).

• It helps users access websites and other online services by resolving domain names to their corresponding IP addresses.

• DNS also helps in email delivery, ensuring that emails are sent to the correct mail servers based on domain names.

• DNS operates through a distr...read more

Routing is the process of selecting the best path for network traffic to reach its destination.

• Routing involves determining the optimal path for data packets to travel from the source to the destination.

• Routers use routing tables to make decisions on how to forward packets.

• Routing protocols like OSPF and BGP are used to exchange routing information between routers.

• Examples of routing devices include routers and layer 3 switches.

A switch is a networking device that connects devices within a local area network (LAN) and forwards data packets between them.

• Switch operates at the data link layer of the OSI model

• It uses MAC addresses to forward data to the correct destination

• Switches improve network performance by reducing collisions and segmenting traffic

• Examples: Cisco Catalyst switches, Juniper EX Series switches