Networking

🖧 Subnet

Subnet is a smaller chunk of a bigger network, created using a subnet mask or CIDR

• (e.g., /27) to split IPs into network and host parts.
  
  It improves efficiency, security, and traffic control

• CIDR /27 means you're borrowing 5 bits from the host portion (since 32 - 27 = 5).

• That gives you 2⁵ = 32 IP addresses in total.

• Out of those, 30 are usable IPs (excluding 1 for network address and 1 for broadcast).

DNS resolver

It stores information about domain names and their corresponding IP addresses in structured records

Handshaking

• TCP make 3 ways handshake in order to establish connection.

OSI Layer

Layer 7, 6 & 5 happens in local level. e.g.- Browser

AWS VPC