Capgemini Network Security Consultant Interview Questions and Answers for Experienced

Q1. Explain about VLAN and how it works?
Ans. 
VLAN is a virtual LAN that separates network traffic based on logical grouping, improving network security and performance.
• VLANs divide a physical network into multiple logical networks, allowing for better traffic management.

• Devices within the same VLAN can communicate directly with each other, while devices in different VLANs require a router to communicate.

• VLANs can be configured based on port, MAC address, or proto...read more
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Q2. Do you know about ospf
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OSPF (Open Shortest Path First) is a routing protocol used to find 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) to build a topology map of the network

• It supports VLSM (Variable Length Subnet Masking) and CIDR (Classless Inter-Domain Routing)

• OSPF uses cost as a metric to d
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Q1. Question related to retention
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Q2. Question related to aspirations
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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.
Ans. 
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
Ans. 
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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General mathematics calculation are in appititude test

Q1. Networking related questions test
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Last 2 round test selected students are talking one topic in rounded table. This is GD round

Q1. HR discuss about the salary details and work locations
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The interview was very good as they asked me my experiences(good & bad) from the day I am professional. How to handle the situations when a senior person makes a mistake. What are the ways of learning that you prefer.

Q1. Which tools have I worked for.
Ans. 
I have worked with a variety of tools as a Network Engineer.
• Cisco Packet Tracer

• Wireshark

• SolarWinds Network Performance Monitor

• Nmap

• GNS3

• Ping

• Traceroute
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Q2. Which technologies I've worked on.
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I have worked on a variety of technologies as a Network Engineer.
• Cisco networking equipment

• Routing and switching protocols (e.g. OSPF, BGP)

• Firewalls and security appliances (e.g. Cisco ASA, Palo Alto)

• Network monitoring and management tools (e.g. SolarWinds, Wireshark)

• Virtualization technologies (e.g. VMware, Hyper-V)

• Load balancers (e.g. F5, Citrix NetScaler)

• Wireless networking (e.g. Cisco Meraki, Aruba)

• Network troubles
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Q3. Brief questions on all technologies and technical terms.
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Q1. No questions. Only HR discussions.
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Q1. Mpls l3 vpn ,ospf bgp stp ethernet ccnp layer 3 devices Sdwan
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Q2. Etherchannel ,vtp l2 vpn deep , python use in network
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Q1. Basics of networking
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Q2. 3 tier architecture
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