Azure Classroomnotes 21/Jun/2023

Networking Concepts to understand

  • DHCP (Dynamic Host Configuration Protocol): DHCP server is responsible for assigning an ip address to the device connected to a network. DHCP can assign static ip to a device or a dynamic from free ip addresses available in network cidr range
  • DNS Server: Networking protocols work with ip addresses, but ip addresses are not human friendly.
    • DNS(Domain Name Server) is about mapping a name and other information to an ip
    • DNS contains Records and Refer Here for record types. Lets focus on two record types A (Domain name to ip) and CNAME (alias to a domain)
    • DNS can be configured at client machine
      • windows C:\windows\system32\drivers\etc\hosts
      • *nix /etc/hosts
    • DNS can be configured at server end as well
      • public DNS
      • internal DNS
    • Public DNS:
      • We would have a DNS Zone where we will maintain the records of DNS Server

Communication between two private networks

  • When you want to communicate between two private network CIDR Ranges should not be colliding
Case A:
Network A: => to
Network B: => to 192.168.1 255
Not colliding

Case B:
Network A: => to
Network B: => to

Having some physical connectivity between them

  • We have network connectivity between two networks, then we need to configure router rules to forward packets from one router to other
  • Consider this as connectivity between two networks in same campus of your organization

Having no direct physical connectivity

  • Consider this as a connectivity between two networks in two different cities

    • Leased Line
    • VPN
  • Note: Work from home or Point to site VPN

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