TCS L2 Network Engineer Interview Questions and Answers

Q1. What's is tha SDN.
Ans. 
SDN stands for Software-Defined Networking, a technology that allows network administrators to manage network services through abstraction of lower-level functionality.
• SDN separates the control plane from the data plane, allowing for centralized control of network traffic.

• It enables network programmability, automation, and flexibility.

• SDN can improve network performance, security, and scalability.

• Examples of SDN techno...read more
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Q2. What's the Switch
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A switch is a networking device that connects devices within a local area network (LAN) and forwards data packets between them.
• Switch operates at Layer 2 of the OSI model

• It uses MAC addresses to forward data within the network

• Switches improve network performance by reducing collisions and segmenting traffic

• Examples of switches include Cisco Catalyst series, Juniper EX series, etc.
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Q3. On which layer does OSI work
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OSI works on the network layer.
• OSI (Open Systems Interconnection) model works on the network layer, which is Layer 3.

• The network layer is responsible for routing packets from the source to the destination across multiple networks.

• Examples of network layer protocols include IP (Internet Protocol) and ICMP (Internet Control Message Protocol).
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MCQ exam CCNA related questions

Q1. What's the Switch? And which layer do work?
Ans. 
A switch is a networking device that operates at Layer 2 of the OSI model, handling data at the data link layer.
• Switches forward data based on MAC addresses

• Operate at Layer 2 of the OSI model

• Used to create LANs and connect devices within a network

• Helps reduce network congestion by only sending data to the intended recipient
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Q2. OSI layer what happens and what do you do
Ans. 
In the OSI model, each layer has specific functions and responsibilities in the communication process.
• The OSI model consists of 7 layers, each with its own specific functions and responsibilities.

• Each layer communicates with the adjacent layers to ensure data is properly transmitted.

• For example, in the OSI model, Layer 1 (Physical layer) deals with the physical connection between devices, while Layer 2 (Data Link layer
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Q3. What is the difference between a Router and a Switch
Ans. 
Routers operate at Layer 3 of the OSI model and make decisions based on IP addresses, while switches operate at Layer 2 and make decisions based on MAC addresses.
• Routers operate at Layer 3 of the OSI model, while switches operate at Layer 2.

• Routers make decisions based on IP addresses, while switches make decisions based on MAC addresses.

• Routers connect different networks together, while switches connect devices within...read more
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Q4. VLAN what is happening
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Q5. What's the DNS ?
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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) into IP addresses (like 172.217.3.206).

• It helps users access websites by translating domain names into IP addresses that computers can understand.

• DNS also helps with email delivery by translating domain names into IP addresses for mail serv...read more
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Q1. What is your qualification and experience?
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Q2. What is your current CTC and how much expected about salary?
Ans. 
I prefer not to disclose my current CTC. As for expected salary, I am open to negotiation based on the job requirements and market standards.
• I am looking for a fair compensation based on my skills and experience

• I am open to negotiation based on the job requirements and market standards

• I prefer not to disclose my current CTC
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Q1. What is your roles and responsibilities?
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Q2. Asking about networking questions?
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Q1. Technical Tricky questions
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Q2. Whay BGP is important in respect of OSPF
Ans. 
BGP and OSPF are both routing protocols, but BGP is used for inter-domain routing while OSPF is used for intra-domain routing.
• BGP is important in respect of OSPF because it allows for communication between different autonomous systems (AS)

• BGP is used to exchange routing information between different AS, while OSPF is used within a single AS

• BGP is used to determine the best path for traffic to take between different AS,...read more
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Q3. What are differences betweeen BGP and IBGP
Ans. 
BGP is used for routing between different autonomous systems, while IBGP is used for routing within the same autonomous system.
• BGP (Border Gateway Protocol) is an exterior gateway protocol used for routing between different autonomous systems.

• IBGP (Internal Border Gateway Protocol) is used for routing within the same autonomous system.

• BGP is used to exchange routing information between different autonomous systems (ASe...read more
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Q4. Can we create SVI in L2 switch? IF not why
Ans. 
No, SVIs cannot be created in L2 switches.
• SVI stands for Switched Virtual Interface.

• It is a virtual interface that represents a VLAN on a Layer 3 switch.

• L2 switches operate at Layer 2 of the OSI model and do not support routing or Layer 3 functionality.

• SVIs are used for routing between VLANs, which is a Layer 3 function.

• L2 switches can only create VLANs and assign ports to them for Layer 2 switching.

• To enable Layer 3 f...read more
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Q5. What is best link of OMP route Internet or MPLS?
Ans. 
The best link of OMP route depends on the specific needs and requirements of the network.
• Internet may be a better option for cost-effectiveness and flexibility, but MPLS may offer better reliability and security.

• Consider factors such as bandwidth, latency, traffic volume, and application requirements.

• Evaluate the pros and cons of each option before making a decision.

• For example, if the network requires low latency and ...read more
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Q6. What is TLOC is Viptela SDWAN, why it is used
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TLOC in Viptela SDWAN stands for Transport Locator and is used to identify the physical or virtual location of a device in the network.
• TLOC is a unique identifier assigned to each device in the SDWAN network.

• It helps in determining the optimal path for traffic routing.

• TLOCs can be based on various parameters such as interface, IP address, or VPN.

• They are used to define the connectivity between different sites in the ne...read more
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