Jeremy’s IT Lab: CCNA Subnetting Lecture

Introduction

• Reminder to subscribe, like, comment, and share the video.
• This is the final video in the subnetting series, a crucial topic for CCNA.

Lecture Agenda

1. Answers to previous quiz questions.
2. Practice questions with Class A addresses.
3. Introduction to VLSM (Variable-Length Subnet Masks).
4. Resources for additional subnetting practice.

Quiz Answers Review

Question 1

• Network: 172.30.0.0/16
• Requirement: 100 subnets, 500 hosts each.
• Solution: Borrow 7 bits for subnets, resulting in a /23 prefix (255.255.254.0).

Question 2

• Host Address: 172.21.111.201/20
• Belonging Subnet: 172.21.96.0/20

Question 3

• Network: 192.168.91.78/26
• Broadcast Address: 192.168.91.127

Question 4

• Network: 172.16.0.0/16, divided into 4 subnets.
• Second Subnet Network Address: 172.16.64.0
• Broadcast Address: 172.16.127.255

Question 5

• Network: 172.30.0.0/16, subnets of 1000 hosts each.
• Possible Subnets: 64 (borrow 6 bits)

Class A Network Subnetting Practice

Example 1

• Network: 10.0.0.0/8
• Requirement: 2000 subnets
• Solution: Borrow 11 bits for subnets, resulting in a /19 prefix.
• Hosts per Subnet: 8190

Example 2

• PC1 Address: 10.217.182.223/11
• Subnet Details:
  • Network Address: 10.192.0.0
  • Broadcast Address: 10.223.255.255
  • First Usable: 10.192.0.1
  • Last Usable: 10.223.255.254
  • Host Addresses: 2,097,150

Introduction to VLSM (Variable-Length Subnet Masks)

• Allows subnets of varying sizes, more efficient than FLSM.
• Example Network: 192.168.1.0/24 divided into 5 subnets for LANs in Tokyo and Toronto.

VLSM Steps

1. Start with the largest subnet.
2. Assign subsequent subnets from largest to smallest.
3. Example subnets for Tokyo and Toronto LANs.

Final Thoughts and Resources

• Subnetting practice recommended with websites:
  • subnettingquestions.com
  • subnetting.org
  • subnettingpractice.com
• Homework: Practice at least one question daily from each site for a week.
• Packet tracer lab available for hands-on practice.

Closing

• Acknowledgment to JCNP-level and JCNA-level channel members.
• Reminder to subscribe, like, and share the video.
• Option to support via tips through BAT and Brave Browser.