NSE.IT Network Engineer Interview Questions and Answers

Q1. Packet flow in PALO ALTO FIREWALL?
Ans. 
Packet flow in Palo Alto Firewall involves multiple stages including ingress, policy lookup, security policy enforcement, NAT, and egress.
• Packet enters the firewall through an ingress interface

• Firewall performs policy lookup to determine if the packet should be allowed or denied

• If allowed, the packet goes through security policy enforcement which includes threat prevention, URL filtering, etc.

• NAT (Network Address Trans...read more
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Q2. Ospf states and explain?
Ans. 
OSPF (Open Shortest Path First) is a routing protocol used to determine the best path for data packets in a network.
• OSPF is a link-state routing protocol

• It uses Dijkstra's algorithm to calculate the shortest path

• OSPF routers exchange link-state advertisements (LSAs)

• It supports VLSM (Variable Length Subnet Masking)

• OSPF areas are used to divide large networks into smaller segments
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Q3. Election of DR AND BDR IN OSPF?
Ans. 
DR and BDR in OSPF are elected based on priority values, with the highest priority becoming the DR and the second highest becoming the BDR.
• DR and BDR are elected within the OSPF network to ensure efficient communication and redundancy.

• The election process is based on priority values assigned to each router, with the highest priority becoming the DR and the second highest becoming the BDR.

• If two routers have the same pr...read more
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Q1. Discuss with HR related to salary
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Q2. Location and position
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Q1. What is Network?
Ans. 
A network is a collection of computers, servers, mainframes, network devices, and other devices connected to one another to share data and resources.
• Networks can be classified based on their size (LAN, WAN, MAN)

• Networks can be wired or wireless

• Examples of networks include the internet, intranets, and extranets
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Q2. What can you tell us about TCP/IP stack? How is it different than OSI Model.
Ans. 
TCP/IP stack is a set of protocols used for communication over the internet, while OSI Model is a conceptual framework for understanding network communication.
• TCP/IP stack is a practical implementation of networking protocols used for communication over the internet.

• It consists of four layers: Application, Transport, Internet, and Link.

• Each layer has its own set of protocols and functions, such as HTTP, TCP, IP, and Et...read more
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Q3. Explain what is VPN?
Ans. 
VPN stands for Virtual Private Network, which allows users to securely access a private network over a public network.
• VPN creates a secure and encrypted connection between the user's device and the private network.

• It helps in protecting sensitive data from unauthorized access or interception.

• VPN can be used to access region-restricted websites or services.

• Common VPN protocols include OpenVPN, L2TP/IPsec, and PPTP.
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Q4. What are different IP classes?
Ans. 
IP classes are categories of IP addresses used to identify networks and hosts.
• There are five classes of IP addresses: A, B, C, D, and E.

• Classes A, B, and C are commonly used for host addresses, while classes D and E are reserved for special purposes.

• Each class has a different range of possible IP addresses.

• Class A addresses start with 1-126, Class B addresses start with 128-191, and Class C addresses start with 192-223...read more
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It is all about basic common questions like Mathematics,Reasoning,English etc

Q1. Y is network is moreuseful to users?
Ans. 
A network is more useful to users because it allows for easy communication, access to resources, and sharing of information.
• Networks enable users to communicate with each other easily and quickly.

• Users can access resources such as files, printers, and applications that are shared on the network.

• Information can be easily shared and disseminated among users on the network.

• Networks provide a platform for collaboration and...read more
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Q2. Is there any breach in the network?
Ans. 
Yes, there is a breach in the network.
• Unusual network traffic patterns

• Unauthorized access to sensitive data

• Unexpected system behavior or performance issues

• Logs indicating suspicious activities

• Security alerts or notifications
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Q3. How to use VPNs and why?
Ans. 
VPNs are used to create secure and private connections over public networks.
• VPNs encrypt data to ensure confidentiality and protect against unauthorized access.

• VPNs allow remote access to private networks, enabling users to securely connect to their work network from anywhere.

• VPNs can bypass geographical restrictions and censorship, providing access to restricted content.

• VPNs can be used to enhance online privacy by ma...read more
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Q4. What does DNS mean?
Ans. 
DNS stands for Domain Name System. It is a decentralized system that translates domain names into IP addresses.
• DNS is responsible for resolving domain names to their corresponding IP addresses.

• It allows users to access websites and other resources using easy-to-remember domain names instead of numerical IP addresses.

• DNS operates through a hierarchical structure of servers, including authoritative DNS servers, recursive...read more
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Q5. Explain about OSI model?
Ans. 
The OSI model is a conceptual framework that standardizes the functions of a communication system into seven layers.
• The OSI model stands for Open Systems Interconnection model.

• It was developed by the International Organization for Standardization (ISO) in 1984.

• The model is divided into seven layers: Physical, Data Link, Network, Transport, Session, Presentation, and Application.

• Each layer has specific functions and int...read more
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Q6. Ips and IDS mean?
Ans. 
IPS stands for Intrusion Prevention System and IDS stands for Intrusion Detection System.
• IPS is a security device that actively monitors network traffic to prevent malicious activities.

• IDS is a security device that passively monitors network traffic to detect potential security breaches.

• IPS can block or prevent malicious traffic from entering the network.

• IDS can only detect and alert about potential security threats.

• Bo...read more
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Q1. Y did u choose networking as carrer
Ans. 
I chose networking as a career because of my passion for technology and problem-solving.
• Passion for technology and problem-solving

• Interest in understanding how computer networks function

• Opportunity to work with cutting-edge technologies

• Ability to troubleshoot and resolve network issues

• Desire to contribute to the development of secure and efficient networks
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Q2. What is ur expected CTC
Ans. 
I would expect a competitive salary based on my experience, skills, and the market standards.
• I would like to discuss the salary range for this position based on the responsibilities and expectations.

• Considering my qualifications and the industry standards, I anticipate a fair compensation package.

• I am open to negotiation and would appreciate a salary that reflects my expertise and contributions.

• I believe a mutually ben...read more
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Q3. Thankyou for joining tgis company
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Q1. Routing & switching,Firewall,SDWAN,
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Discuss networking switching routing Cisco hardware devices

Q1. Technical interview questions
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Q1. Discuss with HR related to salary
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