1 / 8

Classless Addresses

Classless Addresses. A 32 bit number, of n bits followed by h bits, n+h=32, and a mask of length n. Example NH N=10001000100010001000 H=xxxxxxxxxxxx If H is entirely 0’s, it’s the network If H is entirely 1’s, it’s the broadcast. “Class is over”.

maxim
Download Presentation

Classless Addresses

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Classless Addresses • A 32 bit number, of n bits followed by h bits, n+h=32, and a mask of length n. • Example NH • N=10001000100010001000 • H=xxxxxxxxxxxx • If H is entirely 0’s, it’s the network • If H is entirely 1’s, it’s the broadcast

  2. “Class is over” • We leave behind: RIP, IGRP, and the words and concepts “class A” “class B” “class C” • Be sure and tell the Cisco: • ip classless • ip subnet-zero

  3. Network Addresses • Every network address (route) must have a mask associated with it, so the masks are advertised along with the networks • For the RIP v1 case, there was room to include a mask in the RIP v2 advertisements with only a little change to the overall format

  4. Variable Length Subnet Masks • Every network has a mask, so no need for the mask lengths to have equal length. • 128.186.121.0 /25 • 128.186.121.128 /30 • 128.186.121.132 /30 • 128.186.121.136 /29 • Think in bits!! 128.186.121.132 /29 is an incorrect network. Do the math.

  5. VLSM example • Review Figure 7.4 and table 7.1 in Doyle, pp 289-290. Expect a quiz on a similar network sometime. • Example: You must connect 2 networks in Tallahassee with 2 networks in Jacksonville. The TLH nets need to support 25 hosts each, JAX nets, 5 and 10 hosts • You may use only 128.186.1.0 /24

  6. Software Tools • iperf is on all the sun blades /usr/local/bin • iperf –c 192.168.10.1 –p 9 • Connects to TCP discard port on router r1 • Compare iperf –c 192.168.10.1 –p 9 with • iperf –c 192.168.16.6 –p 9 • Can also run iperf –s to become a server • iperf –u to use udp instead of tcp

  7. Software Tools and RIP lab • Use traceroute, ping, and especially iperf to test performance of RIP lab network

More Related