Solved

Network IP/Nodes Question

Posted on 2008-10-22
4
377 Views
Last Modified: 2010-04-10
Given the class A IP network address 10.x.x., how many sub-networks of how many nodes can be created by applying a sub-net mask of 255.255.0.0?
0
Comment
Question by:ashp87
  • 2
4 Comments
 
LVL 4

Expert Comment

by:Scott1201
ID: 22777775
Subnets: 256, if you allow the use of 10.0.X.X and 10.255.X.X

Hosts: 65,534.  256 * 256 is 65,536 minus the host and broadcast addresses.
0
 
LVL 1

Author Comment

by:ashp87
ID: 22777871
Could you explain how you get the number of subnets more?? and also how to get the host and broadcast addresses
0
 
LVL 2

Expert Comment

by:pjcoole
ID: 22777920
When applying a mask of 255.255.0.0 to a Class A address You are usign 8 bits for the network portion, 8 bits for the subnet and 16 bits for the host portion.

You will be able to have:

256 Subnets
65534 hosts on each subnet.
0
 
LVL 4

Accepted Solution

by:
Scott1201 earned 500 total points
ID: 22778332
Sure - the choice of subnet mask determines the number of subnets.  In this case, by choosing a subnet mask of 255.255.0.0, you're "borrowing" eight bits for subnets.  So 10.1.X.X will be on a different subnet than 10.2.X.X, and so forth.  Counting up from 10.0.X.X through 10.255.X.X gives 256 subnets.  (It might make more sense if you write out the binary math a bit.)  

The broadcast address for each subnet will be a combination of the network ID followed by all 1's - so, for the 10.1.X.X subnet with a 255.255.0.0 mask, the broadcast address will be 10.1.255.255.  The network address is the network ID followed by all zeroes, or 10.1.0.0.  Neither of these addresses can be used for a host, that's why I subtracted 2 from the (256 * 256) count.  

Here's a fairly long guide from Cisco that might help: http://www.cisco.com/en/US/tech/tk365/technologies_tech_note09186a00800a67f5.shtml
0

Featured Post

Highfive + Dolby Voice = No More Audio Complaints!

Poor audio quality is one of the top reasons people don’t use video conferencing. Get the crispest, clearest audio powered by Dolby Voice in every meeting. Highfive and Dolby Voice deliver the best video conferencing and audio experience for every meeting and every room.

Join & Write a Comment

Network ports are the threads that hold network communication together. They are an essential part of networking that can be easily ignore or misunderstood, my goals is to show those who don't have a strong network foundation how network ports opera…
Join Greg Farro and Ethan Banks from Packet Pushers (http://packetpushers.net/podcast/podcasts/pq-show-93-smart-network-monitoring-paessler-sponsored/) and Greg Ross from Paessler (https://www.paessler.com/prtg) for a discussion about smart network …
Viewers will learn how to connect to a wireless network using the network security key. They will also learn how to access the IP address and DNS server for connections that must be done manually. After setting up a router, find the network security…
After creating this article (http://www.experts-exchange.com/articles/23699/Setup-Mikrotik-routers-with-OSPF.html), I decided to make a video (no audio) to show you how to configure the routers and run some trace routes and pings between the 7 sites…

706 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question

Need Help in Real-Time?

Connect with top rated Experts

19 Experts available now in Live!

Get 1:1 Help Now