Understanding Subnet Mask in Network Simulation Course
Dive into the world of subnet masks and CIDR notations in the context of network simulation. Learn to determine subnet masks, divide networks, and configure routers to optimize network efficiency. Practice subnetting with exercises and explore default subnet masks and CIDR values for enhanced networking knowledge.
Download Presentation
Please find below an Image/Link to download the presentation.
The content on the website is provided AS IS for your information and personal use only. It may not be sold, licensed, or shared on other websites without obtaining consent from the author. Download presentation by click this link. If you encounter any issues during the download, it is possible that the publisher has removed the file from their server.
E N D
Presentation Transcript
Computer Techniques Engineering Department College of Engineering and Technology Al-Mustaqbal University Network Simulation Course BY Dr. Muamer N. Mohammed 1
Lecture9 Subnetmask 2
SubnetMask Determines which part of an IP address is the network field and whichpart is the hostfield Follow these steps to determine the subnetmask: 1. Express the sub network IP address in binaryform. 2. Replace the network and subnet portion of the address with all1s. 3. Replace the host portion of the address with all0s. 4. Convert the binary expression back to dotted-decimalnotation. 2n-2 2m-2 m is the number of bit in the new host filed after borrowing. is the subnet where n is no. of bitborrowed. 3
SubnetMask Subnet mask in decimal = 255.255.240.0 4
Subnetquestions Answer Five Simple Questions: 5
Exercise 1: Your company has been given a 200.10.57.0 network address. You need to divide your network into two subnets (X and Y) using a router, Answer the following questions. 1 What is the network class? 2 How many bits needed to be borrowed form the host field to the subnet field. 3What is the actual number of hosts per subnet 4- What is the usable number of hosts per subnet 5- What is the subnetmask? 6- What is the IP addresses of the routers NICs at both subnets. Assuming that routers NICs at subnets X and Y takes the first usable host IP addresses at the first and second usable subnetsrespectively. 6
subnet mask: CIDR Subnet masks can be expressed in another form called CIDR (Classless Inter Domain Routing) subnet portion of address of arbitrary length address format: a.b.c.d/x, where x is # of bits in subnet portion of address (1s) only We will explain this in detail in later subnet part host part 11001000 00010111 00010000 00000000 200.23.16.0/23 7
CIDR For example the class C network 200.10.157.0 that is not subnetted, it has a default subnet mask 255.255.255.0. this address can be expressed in CIDR notation in the form 200.10.157.0/24 8
CIDR Values 10
Sub netting chart table Mask 128 64 32 16 8 4 2 1 Sub net maskvalue 128+64+ 32=224 128 128+64 =192 240 248 252 254 255 NetMask C.A/8 /9 /10 /11 /12 /13 /14 /15 /16 NetMask C.B/16 /17 /18 /19 /20 /21 /22 /23 /24 NetMask C.C/24 /25 /26 /27 /28 /29 /30 /31 /32 11
