Triangular Infosolutions Network Engineer Interview Questions and Answers for Experienced

Q1. What is the VRF?
Ans. 
VRF stands for Virtual Routing and Forwarding. It is a technology that allows multiple instances of a routing table to coexist within the same router.
• VRF enables multiple virtual routers to exist within a single physical router

• Each VRF instance maintains its own routing table and forwarding information

• VRF is commonly used in MPLS networks to segregate customer traffic

• VRF provides network segmentation and isolation for
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Q2. What is the HSRP?
Ans. 
HSRP stands for Hot Standby Router Protocol, a Cisco proprietary redundancy protocol used to provide high availability for network services.
• HSRP is used to provide redundancy for routers in a network by allowing multiple routers to work together in a group.

• One router is elected as the active router, handling traffic for the virtual IP address, while the other routers in the group act as standby routers.

• If the active ro...read more
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Q1. BGP and Mpls skill set required
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Q2. Why use BGP in Banking customer
Ans. 
BGP is used in Banking customer for secure and reliable communication between branches and data centers.
• BGP provides secure and reliable communication between branches and data centers in a banking network.

• It allows for efficient routing of traffic and automatic failover in case of network issues.

• BGP helps in maintaining high availability and ensuring data confidentiality in banking operations.
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Q3. Is multiple BGP configured on same router
Ans. 
Yes, multiple BGP can be configured on the same router for redundancy and load balancing.
• Multiple BGP instances can be configured on the same router to handle different peers or address families.

• Each BGP instance will have its own configuration and routing table.

• This setup can provide redundancy and load balancing for network traffic.

• For example, one BGP instance can be used for IPv4 routing while another is used for I
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Q4. Why mpls link required in Banking customer
Ans. 
MPLS links are required in Banking customer for secure and reliable communication.
• MPLS provides secure and reliable communication for sensitive banking data

• Helps in prioritizing traffic for critical banking applications

• Ensures low latency and high performance for real-time transactions

• Supports seamless connectivity between multiple bank branches and data centers
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Q1. How arp generate and its packet flow across the network?
Ans. 
ARP generates and sends packets to map IP addresses to MAC addresses in a network.
• ARP request is broadcasted to all devices on the network

• The device with the matching IP address responds with its MAC address

• ARP table is updated with the IP-MAC mapping

• ARP packets have source and destination MAC addresses, IP addresses, and ARP operation code
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Q2. What is CSMA/CD, and how does this thing work in real life, give an example.
Ans. 
CSMA/CD stands for Carrier Sense Multiple Access with Collision Detection. It is a network protocol used in Ethernet networks to avoid data collisions.
• CSMA/CD is used in Ethernet networks to regulate access to the network medium.

• Before sending data, a device using CSMA/CD listens to the network to check if it is busy.

• If the network is clear, the device sends the data. If a collision is detected, the device stops transm...read more
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Coding is a most important in computer

Aptitude test online mode for the mcq

Group discussion in a company details for tha gd

Assignment test for tha mcq test online

Q1. Interview questions is the most important round
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Q2. Self introduced and company details
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Q1. Hr round is document verification
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Q2. Self introduced and education details
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Q1. General Question
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Q1. DWDM , transmission fault management
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Assessment test ,gd etc

Q1. CCNA, hardware network
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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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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.
Ans. 
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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