TCS Senior Network Engineer Interview Questions and Answers

The network is a system of interconnected devices and communication pathways that allow for the exchange of data and information.

• A network can be wired or wireless

• Devices in a network can include computers, servers, routers, switches, and more

• Networks can be local (LAN), wide area (WAN), or global (Internet)

• Protocols like TCP/IP govern how data is transmitted over a network

Networks are essential for connecting devices and enabling communication and data sharing.

• Facilitates communication between devices

• Enables data sharing and collaboration

• Provides access to resources and services

• Supports remote access and mobility

• Increases efficiency and productivity

BGP attributes are used to determine the best path for routing. Path selection process involves comparing attributes like AS path, local preference, etc.

• BGP attributes include AS path, local preference, MED, origin, etc.

• Path selection process involves comparing attributes in a predetermined order to determine the best path.

• AS path attribute is used to prevent routing loops and determine the shortest path to a destinati...read more

Yes, I have worked on configuring and managing firewalls in various network environments.

• Configured firewall rules to control traffic flow

• Managed firewall policies to ensure network security

• Troubleshooted firewall issues and implemented solutions

• Worked with different firewall vendors such as Cisco, Palo Alto, and Fortinet

Check OSPF configuration, network connectivity, router IDs, subnet mismatches, authentication, and hello/dead timers.

• Verify OSPF configuration on both routers

• Check network connectivity between routers

• Ensure router IDs are unique

• Check for subnet mismatches

• Verify authentication settings

• Check hello and dead timers

SIA (Stuck In Active) is a mechanism in EIGRP to prevent routing loops by marking a route as 'stuck' if a feasible successor is not found.

• SIA occurs when a router is unable to find a feasible successor for a route during a topology change.

• During SIA, the router marks the route as 'stuck' and queries its neighbors for a new path.

• This prevents routing loops by temporarily blocking the affected route until a new feasible

The Internet is a global network of interconnected computers that allows communication and sharing of information.

• The Internet is a network of networks, connecting millions of computers worldwide.

• It enables communication through various protocols like TCP/IP.

• The Internet allows access to a vast amount of information and resources.

• It facilitates services like email, web browsing, online gaming, and file sharing.

• Examples...read more

A server is a central computer in a network that provides services and resources to other computers.

• A server is a powerful computer that is designed to handle multiple requests from client computers.

• It stores and manages data, applications, and services that can be accessed by other computers in the network.

• Servers can be dedicated to specific tasks such as file storage, email, web hosting, database management, etc.

• The...read more

Link state and DV are routing protocols, STP is for loop prevention, BGP is for inter-domain routing.

• Link state protocols (e.g. OSPF) use Dijkstra's algorithm to calculate shortest path.

• Distance vector protocols (e.g. RIP) use Bellman-Ford algorithm and exchange routing tables.

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

• BGP (Border Gateway Protocol) is used for inter-dom...read more