HCLTech Network Specialist Interview Questions, Process, and Tips

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 between devices in a network.

• Each layer has specific functions and communicates with the adjacent layers.

• Examples of layers include physical layer, data link layer, network layer,...read more

RSTP stands for Rapid Spanning Tree Protocol, a network protocol used to prevent loops in Ethernet networks.

• RSTP is an improvement over the original Spanning Tree Protocol (STP) and converges faster in case of network changes.

• It uses port roles (root, designated, alternate, backup) to determine the best path for data transmission.

• RSTP also introduces the concept of edge ports and link types to optimize network performa...read more

Troubleshooting OSPF stuck in exstart stage

• Check if there are any network connectivity issues

• Verify if OSPF neighbor relationships are properly established

• Ensure that OSPF router IDs are unique

• Check for any mismatched OSPF parameters such as area IDs or network types

• Verify if there are any firewall rules blocking OSPF traffic

HSRP provides high availability by allowing multiple routers to work together as a single virtual router, while GLBP provides load balancing and redundancy by distributing traffic across multiple routers.

• HSRP allows for a standby router to take over in case the primary router fails, while GLBP allows for multiple routers to share the traffic load.

• HSRP uses a virtual IP address and a virtual MAC address, while GLBP uses...read more

Overview of OSPF, BGP, STP, VTP, HSRP, VRRP, wireless, packet flow

• OSPF (Open Shortest Path First) is a routing protocol used to find the best path for data packets in a network

• BGP (Border Gateway Protocol) is used to exchange routing information between different autonomous systems

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

• VTP (VLAN Trunking Protocol) manages VLAN config...read more

SDWAN stands for Software-Defined Wide Area Network. It is used to simplify the management and operation of a WAN by decoupling the networking hardware from its control mechanism.

• Improves network performance by utilizing multiple connection types (MPLS, broadband, LTE) and dynamically routing traffic based on application needs

• Enhances security by encrypting traffic and providing centralized visibility and control over ...read more

OMP stands for Overlay Management Protocol in SD-WAN, used for communication between the SD-WAN edge devices and the SD-WAN controller.

• OMP is responsible for exchanging control and management information between the SD-WAN edge devices and the centralized SD-WAN controller.

• It helps in establishing and maintaining the overlay network tunnels in SD-WAN.

• OMP is used to convey routing, policy, and configuration information ...read more