HCL Group L2 Network Engineer Interview Questions and Answers

Q1. How does a packet flow over the internet
Ans. 
A packet flows over the internet by being encapsulated in various network layers and routed through different devices.
• Packet is created at the application layer with data and destination IP address

• Packet is then encapsulated in a frame at the data link layer with source and destination MAC addresses

• Frame is transmitted over physical medium to the next hop based on routing table

• At each hop, the frame is decapsulated and...read more
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Q2. BGP route distributions
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Q1. What is use of routing and its uses?
Ans. 
Routing is the process of selecting the best path for network traffic to reach its destination.
• Routing helps in directing network traffic efficiently

• It determines the best path for data packets to travel from source to destination

• Routing protocols like OSPF, BGP, and EIGRP are used to exchange routing information

• Routing tables are used to store information about network paths

• Dynamic routing adjusts to network changes a
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Q2. What is IPS? How does it work?
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IPS stands for Intrusion Prevention System. It is a network security technology that monitors network traffic to detect and prevent malicious activities.
• IPS is a network security technology that monitors network traffic in real-time.

• It can detect and prevent malicious activities such as hacking attempts, malware infections, and denial-of-service attacks.

• IPS works by analyzing network packets, comparing them to a databa...read more
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Q3. Firewall works at what layer?
Ans. 
Firewall works at the network layer.
• Firewall operates at the network layer of the OSI model.

• It filters and controls incoming and outgoing network traffic based on predetermined security rules.

• Examples of firewalls include hardware firewalls, software firewalls, and cloud-based firewalls.
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Q4. Define firewall generations and their roles
Ans. 
Firewall generations refer to the evolution of firewall technology and their roles in network security.
• First generation firewalls - packet filtering based on IP addresses and ports

• Second generation firewalls - stateful inspection and improved security features

• Third generation firewalls - application layer filtering and deep packet inspection

• Fourth generation firewalls - next-generation firewalls with advanced threat pr...read more
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Q5. What is IP Spoofing?
Ans. 
IP Spoofing is a technique where an attacker impersonates another device by falsifying IP address in order to gain unauthorized access.
• IP Spoofing involves manipulating the source IP address in a packet to deceive the recipient.

• It is commonly used in DDoS attacks to hide the true source of the attack traffic.

• Prevention methods include implementing ingress and egress filtering on network devices.

• Examples of tools used f
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C fibonacci series program asked, Area of interest, about any additional certification

Q1. Simple discussed about company and package
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Q1. Tell me brief about yourself & what are the roles and responsibilities in day to day work profile? Questions from Nexus switch-- VPC? , steps to create vpc? Switch stacking? How does we can set MAC on ...read more
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Q1. What I carried from my current job and nexus switches questions.
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Q2. How I will achieve the IOS upgrade when only I have 10 minutes left in PE window??
Ans. 
Use pre-staged image and fast transfer methods to achieve IOS upgrade within 10 minutes.
• Pre-stage the image on the device before the upgrade window

• Use fast transfer methods like TFTP or FTP to transfer the image quickly

• Ensure all necessary configurations are saved and backed up before the upgrade

• Have a rollback plan in case of any issues during the upgrade
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Q3. Basic questions on my work and last can I do my job in night shifts?
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Q1. What is my expectations and why
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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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Q1. Abouts OSPF,Vpc,Nexus
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Q1. What is bgp and osfp
Ans. 
BGP (Border Gateway Protocol) and OSPF (Open Shortest Path First) are routing protocols used in computer networks.
• BGP is an exterior gateway protocol used to exchange routing information between different autonomous systems.

• OSPF is an interior gateway protocol used to determine the best path for data packets within an autonomous system.

• BGP operates at the network layer and is commonly used in large-scale networks, such...read more
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Q2. Vlan and vtp difference
Ans. 
VLAN and VTP are both networking concepts, but they serve different purposes.
• VLAN (Virtual Local Area Network) is used to logically divide a single physical network into multiple virtual networks.

• VTP (VLAN Trunking Protocol) is a Cisco proprietary protocol used to manage VLAN configurations across a network of switches.

• VLANs provide segmentation, security, and broadcast control, while VTP simplifies VLAN management by ...read more
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Q3. Day to day activities
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Q1. How much salary expected and current salary
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Q2. Why are change job
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Q3. Location mumbai are you interested
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