10+ Senior NOC Engineer Interview Questions and Answers

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

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

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

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

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

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)

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

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

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.