You should have a good understanding of IP sub-netting or this may get a bit confusing.Ĭonvert Second Octet of Multicast IP to Binary
To determine the rest of the MAC address we will use the remaining 23 low order bits to generate the full MAC address. The high order 25 bits of the MAC address are fixed and that is the 01-00-5E. As I explained above, any MAC address you see that starts with 01-00-5E is related to a multicast address. There is a specific range assigned for multicast, 01-00-5E-00-00-00 to 01-00-5E-7F-FF-FF for Ethernet and Fiber Distributed Data Interface (FDDI).
I’ll explain below exactly how to determine the multicast MAC address from the multicast IP as well as provide a few helpful websites.Īt the layer 2 level whenever multicast is used it has to be assigned a MAC address in order to work. I knew that any mac address that started with 01-00-5E was a multicast address, but wasn’t sure how the rest of it was calculated. Chris Bryant covers this and all the other Cisco Routing and Switching topics required for the CCNA certification all in 15+ hours of video training.Recently I was working to track down a multicast problem for a client on an enterprise network and needed to determine what the exact multicast MAC address would be. After that, you need to start practicing so the whole process becomes second nature before you take the exam. You need to make sure you understand the idea behind decimal- to- binary conversion before you continue to learn subnetting. The CCNA exam requires a near-perfect fluency in conversion, IP addressing, and subnetting. It will also prepare you for the Network+ certification through detailed examples and 120 practice exam questions. The following course will teach you everything you need to know about the OSI model, different network protocols, network components, disaster recovery, IP addressing, and much more. This is only one of the fundamentals covered in the CompTIA Network+ training video. This is just the start of IP addressing and decimal-to-binary conversions.
So the IP address of 154.31.16.13 has its binary form equivalent of: So the decimal number 13 is 00001101 in binary form. So the decimal number 16 is 00010000 converted to binary form. I will perform the conversion in one step now. So the decimal number 31 is 00011111 converted to binary form.
Question: Can I subtract 4 from 2? Answer: NO. Question: Can I subtract 8 from 10? Answer: YES.