D18: Subnetting practice
Subnetting isn't about memorizing answers-it's about following a process.
✔️ CIDR → Subnet Mask
✔️ Boundary Octet
✔️ Block Size
✔️ Subnet Range
✔️ Network & Broadcast
✔️ First/Last Usable Host
#CCNA#Networking#Subnetting#IPv4#Connect#ITSupport
D17- CIDR & Subnetting
✔️ CIDR & prefix notation
✔️ Subnet masks
✔️ Total vs usable hosts
✔️ Number of subnets
✔️ Efficient IP address allocation
Subnetting is one of the most important CCNA skills—every calculation brings me closer to mastering networking.
#CCNA#Networking
D16- IPv4 addressing, IP address classes, and CIDR.
🔹 IPv4 address structure
🔹 Class A, B, C, D & E
🔹 Default subnet masks
🔹 Why CIDR replaced classful addressing
🔹 Prefix notation (/24, /26, etc.) and efficient IP allocation
#CCNA#Networking#Subnetting#connect
D15- CCNA Lab: Static Route Troubleshooting
PC1 and PC2 could not communicate, so I began troubleshooting by checking routing tables and interface configurations on each router.
@CyberRacheal 127.0.0.1 is called the loopback IP address. When your device sends data to 127.0.0.1, it does not go to the internet or any other device. It comes back to your own machine.
Connectivity Test
Performed end-to-end ping testing.
Initial packets timed out while ARP tables populated.
Subsequent pings were successful, confirming connectivity restoration.
Checked R3 configuration.
Discovered an incorrect IP address on the R3
Verification/Fix
Corrected the IP addressing issue and verified the static route configuration.
@CyberLoti Thanks! really appreciate the encouragement. I'm trying to focus on understanding the "why" behind the commands, not just memorizing them. More labs coming soon!
🧵 Day 12 of learning Networking: IPv4 Addressing Basics
Today I revised IPv4 address classes, loopback addresses, netmasks, and host calculations. 👇
1- IPv4 addresses are 32 bits long and written in dotted-decimal format (e.g., 192.168.1.10).
5-Netmask identifies the network & host portions of an IP ad.
Ex:
Class A → 255.0.0.0 (/8)
Class B → 255.255.0.0 (/16)
Class C → 255.255.255.0 (/24)
6-Host rules:
✅ Host bits all 0s =Network address
✅ Host bits all 1s =Broadcast address
❌ Neither can be assigned to devices