Royal Green Manager, IP Core Network Interview Questions and Answers for Experienced

Q1. Q1. What is Protocol and full Explanation. Ans. Protocol is a set of rules which are used in digital communication to connect network device and Exchange information between them.
Ans. 
Protocol is a set of rules used in digital communication to connect network devices and exchange information.
• Protocols define the format, timing, sequencing, and error checking of data transmission.

• Examples of protocols include TCP/IP, HTTP, FTP, and SMTP.

• Protocols ensure that devices can communicate effectively and understand each other's data.

• Different protocols serve different purposes, such as routing data, sending
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Q2. Q2. What is a Gateway and full Explanation. Ans. Gateway is a hardware device that is used to connect two dissimilar type of network. It allows us to send and receive data through the internet event it is ...read more
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A gateway is a hardware device that connects two dissimilar types of networks, allowing data to be sent and received through the internet even if it is a LAN network.
• Gateway acts as an entry and exit point for data traffic between networks

• It translates data between different network protocols

• Examples include routers and firewalls that connect a local network to the internet
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Q1. BGP and Mpls skill set required
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Q2. Why use BGP in Banking customer
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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
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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. Technical questions
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Q2. Sellery discussion
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Q3. Knowledge of networking
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Q4. Knowledge of networking ccna
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Q5. Routing and switching knowledge
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Q6. Basic networking questions
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Q1. What can I do
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Q2. Simple way discussion
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Q1. Ospf, bgp states
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Q2. How stp work in 3 switches
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STP (Spanning Tree Protocol) is used to prevent loops in a network by blocking redundant paths between switches.
• STP elects a root bridge to serve as the central point in the network

• Each switch determines the best path to the root bridge based on the lowest path cost

• Ports on switches are designated as root ports, designated ports, or blocking ports to create a loop-free topology
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Q1. How arp generate and its packet flow across the network?
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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.
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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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English comphresion,logical reasoning,Numerical

Q1. Basics of Electronics and Telecommunication Engineering
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Q1. Basic of interview questions
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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
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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
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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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