Networking

12 notes

• Cloud Concepts & Connectivity

  Virtual versions of network devices like routers or firewalls. NFV replaces traditional network hardware (like routers, firewalls, load balancers) with…

  nfv · vpc · cloud · connectivityUpdated Sep 17, 2026

• IPv4 Addressing

  An IPv4 address is a unique identifier made up of a 32-bit number written as four octets (e.g., 192.168.1.10). Each octet ranges from 0–255. A DHCP server is a…

  ipv4 · dhcp · apipa · rfc1918Updated Sep 17, 2026

• Modern Networks (SDN, SD-WAN, VXLAN, SASE)

  SDN is a network architecture that separates the control plane (brains) from the data plane (traffic forwarding). Instead of configuring each router or switch…

  sdn · sd-wan · vxlan · sase · ipv6Updated Sep 17, 2026

• Network Devices

  Routers, switches, firewalls, and load balancers — what each one actually does at the packet level, not the marketing-brochure description.

  router · switch · firewall · nas · sanUpdated Sep 17, 2026

• Network Topologies

  Concept Definition Used For Pros Cons Mesh Every node connected to every other WAN, data centers Redundant Expensive Hybrid Mix of multiple topologies Large…

  topology · spine-leaf · three-tierUpdated Sep 17, 2026

• Networking Concepts

  Segmentation means dividing a large network into smaller logical or physical parts, like cutting one big noisy room into smaller, quieter rooms. Each “segment”…

  segmentation · vlan · arp · broadcast-domainUpdated Sep 17, 2026

• Networking Nuggets

  Word Meaning Example -- -- --- Latency The time delay in a network system. It's the total time it takes for a piece of data (a packet) to travel from the…

  latency · jitter · overheadUpdated Sep 17, 2026

• OSI Model

  The seven-layer model explained the way it actually clicks: as a chain of partnerships, from your intent down to raw bits on a wire.

  osi · encapsulationUpdated Sep 17, 2026

• Ports & Protocols

  Port Protocol Use 22 SSH (Secure Shell) / SFTP Provides encrypted remote command-line access and secure file transfers. SFTP runs over SSH to encrypt data in…

  ports · tcp · udp · ipsecUpdated Sep 17, 2026

• Subnetting (Basics)

  Binary uses only two values: 0 or 1 Each bit represents a single binary value (0 or 1) 1 bit = 0 or 1 1 byte = 8 bits 1 octet = 1 byte = 8 bits In networking,…

  subnetting · ipv4 · binaryUpdated Sep 17, 2026

• Subnetting Cheatsheet

  Group Size Subnet Mask (Last Octet) CIDR Octet CIDR 3rd Octet CIDR 2nd Octet 1st CIDR 128 128 /25 /17 /9 /1 64 192 /26 /18 /10 /2 32 224 /27 /19 /11 /3 16 240…

  subnetting · cheat-sheetUpdated Sep 17, 2026

• Transmission Media

  These are the IEEE Wi-Fi standards — they define how wireless communication happens over the air. Standard Frequency Max Speed Range notes -- -- -- -- --…

  wifi · ethernet · fiber · transceivers · cablingUpdated Sep 17, 2026