SUBNET MASKING TRAINER

FIXED-LENGTH & VLSM SUBNETTING PRACTICE — /24 NETWORKS

// ASSIGNED NETWORK ADDRESS

GIVEN IP ADDRESS WITH /24 SUBNET

---

// SUBNETTING QUESTIONS — answer all fields

// BASE NETWORK — VLSM ASSIGNMENT

BASE /24 NETWORK

---

Divide this /24 into VLSM subnets to satisfy the host requirements below

// SUBNET ALLOCATIONS — fill in for each subnet

// CIDR / SUBNET MASK CHEAT SHEET

CIDR	SUBNET MASK	NETWORK BITS	HOST BITS	BLOCK SIZE	TOTAL IPs	USABLE HOSTS

// KEY FORMULAS

Network Address

            IP AND Subnet Mask

            Host bits all set to 0

Broadcast Address

            Network address + Block Size - 1

            Host bits all set to 1

Usable Hosts

            2^(host bits) - 2

            Minus network & broadcast

Block Size

            2^(host bits)

            = Total IPs per subnet

VLSM Rule

            Sort subnets LARGEST first

            Allocate in order, no overlap

First / Last Usable

            First = Network + 1

            Last = Broadcast - 1

// STUDENT FEEDBACK WALL //

What Students Are Saying

Feedback is shown here after each quiz attempt — visible to everyone on this page

        💬 No feedback yet — complete a quiz and be the first to leave a rating!
      

Elite Engineer Official