Sameer Naik

    1–10: Network Management Configure and manage routers and switches Set up and maintain firewalls Monitor network performance and uptime Troubleshoot connectivity issues Implement VPNs for secure remote access Manage IP address allocations and DHCP Ensure network security and access controls Update and patch network firmware Monitor and respond to intrusion attempts Document network topology and configurations   11–20: Server & Systems Administration Install and configure Windows/Linux servers Manage Active Directory and domain controllers Apply OS and software updates regularly Monitor system performance (CPU, memory, storage) Perform user account and permission management Troubleshoot server issues and outages Manage DNS and name resolution services Set up and manage Group Policies (GPOs) Perform scheduled server reboots and maintenance Automate system tasks using scripts (e.g., PowerShell, Bash)   21–30: Cloud Infrastructure Set up and configure cloud resou...

  1–15: System Installation & Configuration Install RHEL operating systems (bare metal or virtual machines) Configure system time, locale, and hostname Set up user accounts, groups, and permissions Install and configure software packages using  yum  or  dnf Configure system services and runlevels (systemd) Set up and manage partitions and logical volumes (LVM) Mount and manage file systems (ext4, XFS, NFS, etc.) Configure swap space Set kernel parameters using  sysctl Register systems with Red Hat Subscription Manager Configure network interfaces and DNS settings Set static IPs and manage using  nmcli  or  nmtui Manage system logs with  rsyslog  or  journalctl Configure SELinux policies and modes Install and configure graphical environments (GNOME/KDE if needed)   16–25: Security & Access Control Configure firewalls using  firewalld  or  iptables Set up SSH key-based authentication Harden system access (d...

  Key Features of Open Source Cloud Management Systems: Multi-cloud or hybrid cloud orchestration Infrastructure provisioning  (compute, storage, network) Resource monitoring and usage tracking Self-service portals for users Billing, quota, and policy management Automation and DevOps integration (e.g., Ansible, Terraform) Support for virtualization and containerization (VMs, Kubernetes)   Popular Open Source Cloud Management Systems: 1.  OpenStack Most widely adopted open source cloud platform. Manages compute (Nova), storage (Cinder, Swift), and networking (Neutron). Used for building private and public clouds. Backed by a large community and vendors like Red Hat, Canonical. 2.  CloudStack Simpler alternative to OpenStack. Designed for deploying and managing large-scale IaaS clouds. User-friendly and supports multiple hypervisors (KVM, Xen, VMware). 3.  Eucalyptus   (now open-core) Compatible with AWS APIs. Helps organizations build private clouds wit...

    Advanced Neutron Features (Testable in Lab Setup) Feature Description Lab Suitability 1. Provider Networks Direct VMs to external networks using flat or VLAN-type networking  Yes 2. Self-Service (Tenant) Networks Allow users to create isolated VXLAN-based networks  Yes 3. Floating IPs Map public IPs to private VM IPs  Yes 4. DHCP Agent Automatic IP allocation for VMs via Neutron-managed DHCP  Yes 5. L3 Routing Agent Enable routing between tenant networks and external network  Yes 6. Security Groups Virtual firewalls applied to VM interfaces  Yes 7. Metadata Service Provide instance config data via Neutron for cloud-init  Yes 8. Layer 3 High Availability (L3HA) Redundant L3 agents for external connectivity failover  Needs 3+ nodes 9. Distributed Virtual Routing (DVR) Decentralized L3 routing at compute nodes for east-west traffic  With 3+ nodes 10. VLAN Trunking Attach VLAN-tagged sub-interfaces to VMs for advanced networking ...

   What Is a  RADIUS Server ? RADIUS (Remote Authentication Dial-In User Service)  is a  network protocol and server  that provides  centralized Authentication, Authorization, and Accounting (AAA)  for users connecting to a network. It is widely used to authenticate users for: VPN access Wi-Fi networks Network devices (routers/switches) Enterprise login systems  How RADIUS Works User connects  to a device (e.g., Wi-Fi AP, VPN). The  NAS (Network Access Server)  forwards credentials to the  RADIUS server . RADIUS: Authenticates  user (usually via a database like LDAP, AD, or local file). Authorizes  access level (e.g., VLAN, firewall rules). Logs  usage/accounting data (e.g., session time, data used). User is granted or denied access.  Key RADIUS Server Software FreeRADIUS  (most popular open-source RADIUS server) Microsoft NPS (Network Policy Server) Cisco ISE Radiator TekRADIUS daloRADIUS  (w...