Senior NOC Engineer

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10+ Senior NOC Engineer Interview Questions and Answers

Updated 30 Jan 2025

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Q1. What else you troubleshoot in data centre?

Ans.

Apart from network issues, I troubleshoot server hardware, storage, power, cooling, and security in data centre.

  • Server hardware issues such as failed hard drives, RAM, or CPU

  • Storage issues such as disk space, RAID failures, or SAN connectivity

  • Power and cooling issues such as UPS failures, overheating, or HVAC problems

  • Security issues such as unauthorized access, firewall misconfigurations, or DDoS attacks

Q2. What is your understanding of Local Area Networks (LAN) and Wide Area Networks (WAN)?

Ans.

LAN is a network that connects devices within a limited area, while WAN connects devices over a larger geographical area.

  • LAN is typically used in homes, offices, or small businesses to connect devices like computers, printers, and servers.

  • WAN connects LANs in different locations, such as connecting offices in different cities or countries.

  • LANs are usually faster and have lower latency compared to WANs due to the smaller geographical area.

  • Examples of LAN technologies include E...read more

Senior NOC Engineer Interview Questions and Answers for Freshers

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Q3. What you do in Linux environment?

Ans.

I work with Linux servers, managing and troubleshooting them.

  • Install and configure Linux servers

  • Monitor server performance and troubleshoot issues

  • Manage user accounts and permissions

  • Automate tasks with shell scripting

  • Implement security measures

  • Install and configure software applications

  • Maintain backups and disaster recovery plans

Q4. Monitoring of Linux servers and doing patching works.

Ans.

Monitoring and patching of Linux servers is crucial for maintaining their security and stability.

  • Regularly monitor server logs and performance metrics to identify any issues or vulnerabilities.

  • Stay up-to-date with security patches and updates, and schedule regular maintenance windows for patching.

  • Test patches in a non-production environment before applying them to production servers.

  • Use automation tools like Ansible or Puppet to streamline patching and configuration managemen...read more

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Q5. what is OSI model. What is VLAN VTP STP BGP OSPF EIGRP

Ans.

The OSI model is a conceptual framework that standardizes the functions of a telecommunication or computing system into seven layers.

  • VLAN stands for Virtual Local Area Network and is used to segment network traffic.

  • VTP (VLAN Trunking Protocol) is a Cisco proprietary protocol used to manage VLAN configurations across a network.

  • STP (Spanning Tree Protocol) is used to prevent loops in Ethernet networks.

  • BGP (Border Gateway Protocol) is a routing protocol used to exchange routing ...read more

Q6. What is BGp? And it's attributes

Ans.

BGP (Border Gateway Protocol) is a standardized exterior gateway protocol used to exchange routing information between different autonomous systems on the internet.

  • BGP is a path vector protocol that uses TCP as its transport protocol.

  • It is used to make routing decisions based on network policies, rules, and attributes.

  • BGP attributes include AS_PATH, NEXT_HOP, LOCAL_PREF, MED (Multi-Exit Discriminator), and WEIGHT.

  • AS_PATH attribute contains the list of autonomous systems that ...read more

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Q7. What are load balancing network devices?

Ans.

Load balancing network devices distribute network traffic across multiple servers to prevent overload and improve performance.

  • Load balancers can be hardware or software-based

  • They help optimize resource utilization and ensure high availability

  • Common examples include F5 BIG-IP, Citrix NetScaler, and NGINX

  • They can use various algorithms like round-robin, least connections, and IP hash

Q8. What is STP and it'spec.

Ans.

STP stands for Spanning Tree Protocol. It is a network protocol that ensures a loop-free topology for Ethernet networks.

  • STP prevents loops in Ethernet networks by blocking redundant paths

  • It elects a root bridge to serve as the central point in the network

  • STP uses Bridge Protocol Data Units (BPDUs) to exchange information between switches

  • Common variants include RSTP (Rapid Spanning Tree Protocol) and MSTP (Multiple Spanning Tree Protocol)

Q9. Whatisospf andit's states

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)

  • OSPF has different states: Down, Init, 2-Way, Exstart, Exchange, Loading, Full

Q10. What is the VTP?

Ans.

VTP stands for VLAN Trunking Protocol, used in Cisco networks to manage VLAN configurations across multiple switches.

  • VTP is used to synchronize VLAN information across a network of Cisco switches.

  • It helps in reducing the administrative overhead of manually configuring VLANs on each switch.

  • VTP operates in client, server, and transparent modes.

  • Changes made to VLAN configurations on a VTP server are propagated to VTP clients in the same VTP domain.

  • VTP version 3 supports enhanced...read more

Q11. Tell about vlan

Ans.

VLAN stands for Virtual Local Area Network, used to logically segment a network.

  • VLANs help in improving network performance and security by isolating traffic.

  • They allow multiple networks to coexist on the same physical infrastructure.

  • VLANs are configured at the switch level and can span multiple switches.

  • Each VLAN has its own broadcast domain, reducing unnecessary network traffic.

  • VLANs are identified by a VLAN ID (VID) which is a number between 1 and 4096.

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