Inspirisys Solution Network Security Engineer Interview Questions and Answers

Q1. What is VTP (VLAN Trunking Protocol)?
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Q2. What actions would you take if the switch enters ROMMON mode after a reboot?
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Q1. What is the SMTP?
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Q2. What is the RSMTP?
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Q3. Tell about TCP Rest
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Q1. What is Network?
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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.
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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?
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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?
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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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Q1. Explain Firewall
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Firewall is a network security system that monitors and controls incoming and outgoing network traffic based on predetermined security rules.
• Firewall acts as a barrier between a trusted internal network and untrusted external network.

• It can be implemented in hardware, software, or a combination of both.

• Firewalls can filter traffic based on IP addresses, ports, protocols, and application types.

• They can prevent unauthori...read more
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Q2. Explain Switching and routing
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Switching involves forwarding data packets within a network, while routing involves determining the best path for data packets to travel between networks.
• Switching operates at Layer 2 of the OSI model, using MAC addresses to forward data within a local network.

• Routing operates at Layer 3 of the OSI model, using IP addresses to determine the best path for data to travel between networks.

• Switches use MAC address tables t...read more
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Q1. Salary related questions
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Q2. Location and position
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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?
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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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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?
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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?
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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
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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. Depending on candidate
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Q2. Solve the solution
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Q3. Provide support
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Must have knowege of the work

Q1. Nothing only basic they are osking
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Q2. Must have basic knowledge of the work
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