HCL Group Lead Network Engineer Interview Questions and Answers

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Q1. Technical vs no tech
Ans. 
Technical skills are essential for a Network Engineer, but soft skills are also important for effective communication and teamwork.
• Technical skills are necessary for configuring and troubleshooting network devices.

• Soft skills like communication, teamwork, and problem-solving are crucial for working effectively with colleagues and clients.

• Balancing technical expertise with interpersonal skills is key to success in the r...read more
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Q2. Dhcp vs dns gdp vs rdp frp vs 30nd
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DHCP is a protocol used to assign IP addresses dynamically to devices on a network, while DNS is a system that translates domain names to IP addresses.
• DHCP assigns IP addresses to devices on a network dynamically

• DNS translates domain names to IP addresses

• RDP (Remote Desktop Protocol) allows users to remotely connect to a computer

• FRP (Fiberglass Reinforced Plastic) is a material used in construction

• 30nd does not seem to
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Q1. Introduction of myself
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Q2. Difference between c and c++
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C is a procedural programming language while C++ is an object-oriented programming language.
• C is a procedural programming language, while C++ is a combination of procedural and object-oriented programming.

• C does not support classes and objects, while C++ does.

• C is a subset of C++, meaning all valid C programs are also valid C++ programs.

• C++ has additional features like function overloading, templates, and exception han
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Q1. Introduction 🤣
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Q2. Tell me your weakness ? 🤣
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Q1. General discussion
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Q1. Questions related to networking
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Q2. Routers switch configuration and commands
Ans. 
Routers switch configuration and commands involve setting up and managing network devices for efficient data routing.
• Routers use commands like 'show ip route' to display routing table information

• Configuration involves setting up IP addresses, subnet masks, and default gateways

• Commands like 'show interfaces' can display interface status and configuration details
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Q1. Question related to retention
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Q2. Question related to aspirations
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Q1. Basic questions , about expected salary , work experience
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Q1. Networking CCNA question, windows troubleshooting
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Q1. Managerial interview question
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Q1. Must Hsrp, access list, stp and routing protocols
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Q2. Switching protocol, GRE tunnel, ipsec tunnel, Cisco WLC
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Q1. Bgp, vtp , vlan, DHCP
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Q1. Routing tables in bgp and explain
Ans. 
BGP routing tables store information about routes to different networks and the best path to reach them.
• BGP uses a path-vector routing protocol to determine the best path for a packet to reach its destination.

• BGP routing tables contain information about the network prefixes, the next hop to reach them, and the path attributes that determine the best path.

• BGP routers exchange routing information with their neighbors to ...read more
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Q2. BGP Neighbor Table – table containing information about BGP neighbors. 2) BGP Table (also known as BGP topology table, BGP RIB) contains the network layer reachability information (NLRI) learned in compli...read more
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Q3. What is nat and port number that can be used
Ans. 
NAT is a technique used to map private IP addresses to public IP addresses. Port numbers are used to identify specific applications.
• NAT stands for Network Address Translation

• It is used to allow devices with private IP addresses to access the internet using a public IP address

• Port numbers are used to identify specific applications or services

• Common port numbers include 80 for HTTP, 443 for HTTPS, and 22 for SSH
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Q4. If neither the port range in source NAT pools nor the default port range are configured, the default single port range is 1024 through 63,487.
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Default single port range when neither port range in source NAT pools nor default port range are configured.
• When neither port range in source NAT pools nor default port range are configured, the default single port range is 1024 through 63,487.

• This range is used for outbound traffic initiated by the device.

• It is important to configure the port range to avoid conflicts with other devices on the network.

• For example, if m...read more
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Q5. What is mss in tcp explain
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MSS in TCP refers to the maximum segment size, which is the largest amount of data that can be sent in a single TCP segment.
• MSS is negotiated during the TCP three-way handshake

• It is determined by the maximum transmission unit (MTU) of the network

• MSS can be adjusted by the sender or receiver using TCP options

• A smaller MSS can help prevent fragmentation and improve network performance
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Q6. The maximum segment size is a parameter of the options field of the TCP header that specifies the largest amount of data, specified in bytes, that a computer or communications device can receive in a singl...read more
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Q7. Troubleshooting pAcket drops
Ans. 
Packet drops can be caused by various factors. Troubleshooting involves identifying the root cause and implementing a solution.
• Check for network congestion or bandwidth limitations

• Verify if the packet is being dropped at the source or destination

• Inspect network devices for errors or misconfigurations

• Use packet capture tools to analyze the traffic

• Consider implementing Quality of Service (QoS) policies

• Update firmware or
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Q8. Chekc port and duplex setting. Check mss and mtu Check link utilization
Ans. 
To check port and duplex setting, MSS and MTU, and link utilization in network engineering.
• Use command 'show interface' to check port and duplex setting.

• Use command 'ping -f -l ' to check MTU.

• Use command 'netstat -s' to check MSS.

• Use command 'show interface' or 'show interfaces utilization' to check link utilization.
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