This document contains a set of practice questions on the topics of networks and protocols ,The questions are designed to help you test your knowledge of the material and prepare for exams such as the Cisco CCNA or the CompTIA Network+. The document has exercises who cover a variety of topics in Ne...
4. Modified mask if networks have (1) 60, (2) 15 and (3) 200 subnets respectively.
5. Subnet address and number.
6. The number of the machine on the subnet.
7. Usable address ranges for the first three subnets.
Solution
● For address 145.245.45.225
, The first byte of the address gives a binary value of 10010001. The first two bits indicate that
this is a class B address.
The default mask for a class B is: 255.255.0.0 (/16). In binary:
11111111.11111111.00000000.00000000.
To find the default network address, we'll apply the default network mask to the IP address using
an "and" function. We'll get: 145.245.0.0.
To obtain 60 network subdivisions, we need to increase the network mask by 6 bits. Indeed, 26
gives 64, which is the smallest exponent of 2 greater than 60. The subnet mask will therefore be
255.255.252.0 (/22). In binary: 11111111.11111111.11111100.00000000.
To find the subnet address, we'll apply the subnet mask to the IP address using an "and"
function. We'll get: 145.245.44.0. To find the subnet number, we'll consider only the dedicated
subnet bits of the IP address. You'll get: 11.
To find the machine number in the subnet, we'll only consider the bits dedicated to the machine
in the IP address. We'll get: 481.
To determine the subnet addresses, we'll vary the 6 subnet bits from 000000 to 111111. Within
each subnet, to determine all usable addresses, we'll vary the 10 machine bits from
0000000001 to 1111111110. This will give us :
Network address 1st usable address Last usable address
145.245.0.0 145.245.0.1 145.245.3.254
145.245.4.0 145.245.4.1 145.245.7.254
145.245.8.0 145.245.8.1 145.245.11.254
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller WhiteNoteBook. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $4.49. You're not tied to anything after your purchase.
