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CCNA Drag and Drop Question #8.

This is an Updated real CCNA exam question (June-2012). You might see a different IP addressing,  Port allocation and Configurations.

As usual, take time to read through the question so as to clearly understand what Cisco want you to do.

Note: This drag and drop question is used for demonstration only; you might see different IP addressing and Port allocation in the real CCNA exam. But it all works the same way if you could just understand the technique.

I suggest you use packet tracer for practice.
 
 

Question 1:

Refer to the exhibit. A dental firm is redesigning the network that connects its three locations. The administrator gave the networking team 172.16.100.0 to use for addressing the entire network. After subnetting the address, the team is ready to assign the addresses. The administrator plans to configure ip subnet-zero and use RIP v2 as the routing protocol.

As a member of the networking team, you must address the network and at the same time, conserving unused addresses for future growth. With those goals in mind, drag the host addresses below to the correct router interface. Once of the routers is partially configured. Move your mouse over a router to view its configuration.
(Not all of the host addresses on the left are necessary).
 
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Answer
 
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Brief Explanation:

This is all about testing you knowledge on IP addressing, especially VLSM like in this case . To be honest; you can’t escape IP addressing in CCNA.

It’s recommended that when you come across this type of question; you begin your calculation from the network with the biggest number of host (16 hosts) down to the smallest (2 hosts).

If you are familiar with working with the formula 2n - 2 (n represents the number of bits to borrow).

As I have always mentioned, write out the cram table to save you time:

Bit Value

128

64

32

16

8

4

2

1

Bits Borrowed

1

2

3

4

5

6

7

8

Subnet mask

128

192

224

240

248

252

254

255

Subnet Prefix /CIDR

/25

/26

/27

/28

/29

/30



 16 hosts = 25 - 2 (you borrow 5 bits = /27)
  11 hosts = 24 - 2 (you borrow 4 bits = /28)
    5 hosts = 23 - 2 (you borrow 3 bits = /29)

The Floss serial interface S0/0 only requires 2 hosts = 22 - 2 (you borrow 2 bits = /30).


This might be a bit confusing, read this if you are new in Variable Length Subnet Mask (VLSM)

 
 
 
 


 
 
 
 
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