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Network + Week 1 > 1-13 INTRODUCTION TO VLSM > Flashcards

1-13 INTRODUCTION TO VLSM Flashcards

1
Q

What is variable length subnet mask (VLSM)?

A

VLSM divides an IP network into subnetworks of different sizes for more efficient IP address allocation. It allows granular address allocation based on subnet needs, optimizing IP space usage.

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2
Q

How does VLSM work in IP subnetting?

A

VLSM assigns different subnet masks to subnets, allowing variable host numbers in each. It involves dividing larger subnets into smaller ones, each with a unique mask. Careful planning is needed to prevent address conflicts and ensure proper allocation.

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3
Q

Example 1 - Subnetting a 192.168.0.0/24 network

A

Scenario: You have a network with an IP range of 192.168.0.0/24. This network needs to be divided into three subnets - HR needs 50 hosts, Sales needs 30 hosts, and IT needs 10 hosts.

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4
Q

Subnetting for 50 hosts

A

You need at least 6 bits for hosts (2^6 = 64, 64-2 = 62 usable addresses). The subnet mask will be /26. Subnet 1: 192.168.0.0/26.

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5
Q

Subnetting for 30 hosts

A

5 bits are needed (2^5 = 32, 32-2 = 30 usable addresses). The subnet mask will be /27. Subnet 2: 192.168.0.64/27.

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6
Q

Subnetting for 10 hosts

A

4 bits are sufficient (2^4 = 16, 16-2 = 14 usable addresses). The subnet mask will be /28. Subnet 3: 192.168.0.96/28.

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7
Q

Subnet details for Subnet 1

A

Subnet 1 - 192.168.0.0/26
Network ID - 192.168.0.0
Broadcast Address - 192.168.0.63
Usable IP Range - 192.168.0.1 to 192.168.0.62
IP Range - 192.168.0.0 to 192.168.0.63
Number of Usable Hosts - 62

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8
Q

Subnet details for Subnet 2

A

Subnet 2 - 192.168.0.64/27
Network ID - 192.168.0.64
Broadcast Address - 192.168.0.95
Usable IP Range - 192.168.0.65 to 192.168.0.94
IP Range - 192.168.0.64 to 192.168.0.95
Number of Usable Hosts - 30

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9
Q

What is the Network ID for Subnet 3 192.168.0.96/28

A

192.168.0.96

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10
Q

What is the Broadcast Address for Subnet 3?

A

192.168.0.111

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11
Q

What is the Usable IP Range for Subnet 3?

A

192.168.0.97 to 192.168.0.110

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12
Q

What is the IP Range for Subnet 3?

A

192.168.0.96 to 192.168.0.111

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13
Q

How many Usable Hosts are in Subnet 3?

A

14

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14
Q

What is the result of adding 1 bit to the node portion?

A

2 networks/126 nodes

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15
Q

What is the result of adding 2 bits to the node portion?

A

4 networks/62 nodes

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16
Q

What is the result of adding 3 bits to the node portion?

A

8 networks/30 nodes

17
Q

What is the result of adding 4 bits to the node portion?

A

16 networks/14 nodes

18
Q

What is the result of adding 5 bits to the node portion?

A

32 networks/6 nodes

19
Q

What is the result of adding 6 bits to the node portion?

A

64 networks/2 nodes

Network + Week 1 (16 decks)

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