Every Ethernet interface has a 6 byte address stored in the interface hardware

Every ethernet interface has a 6 byte address stored

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Every Ethernet interface has a 6-byte address stored in the interface hardware called: o physical address o MAC (medium access control) address o Data-link address Set by manufacturer – a serial number Values written in hexadecimal notation. Example: 18-5E-0F-0A-38-2D 56
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IT 263 & TDC 405 ‐ Autumn 2018 19 Sept 2018 Dr. Oteafy © 2018 29 Device addresses Address information (both MAC and IP) for a network connection can be found Network details or by running “ipconfig /all” (“ifconfig” on Mac). 57 What happens when we “mail” a request and get a response Bigger picture
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IT 263 & TDC 405 ‐ Autumn 2018 19 Sept 2018 Dr. Oteafy © 2018 30 Example: Web Request Web Server Browser Src Port = 52531 Dest. Port = 80 Src IP = 140.192.35.12 Dest. IP = 140.192.81.6 IP: 140.192.81.6 Phy: 00:B9:72:32:11:AD IP: 140.192.35.12 Phy: 00:A1:B2:33:44:DD (O.S. assigns port #52531 to this browser process) In Response packet, Src and Dest values will be swapped in Ethernet, IP and TCP headers HTTP Request Src Phy = 00:A1:B2:33:44:DD Dst. Phy = 00:B9:72:32:11:AD 59 Relationship of layers and addresses in TCP/IP 60
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IT 263 & TDC 405 ‐ Autumn 2018 19 Sept 2018 Dr. Oteafy © 2018 31 Ethernet Most common LAN type Ethernet Most widely used LAN technology Operates in the data link layer and the physical layer Family of networking technologies that are defined in the IEEE 802.2 and 802.3 standards Supports data bandwidths of 10, 100, 1000, 10,000, 40,000, and 100,000 Mbps (100 Gbps) 62
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IT 263 & TDC 405 ‐ Autumn 2018 19 Sept 2018 Dr. Oteafy © 2018 32 Ethernet Protocols 63 Wired Ethernet LAN A group of devices connected into Ethernet hubs or switches. Each LAN device has a wired Ethernet interface called a LAN Port or Network Interface Card (NIC) or adapter. 64
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IT 263 & TDC 405 ‐ Autumn 2018 19 Sept 2018 Dr. Oteafy © 2018 33 GOLDMAN: LAN FIG. 01-05 Network Interface Card (NIC) Networking Software (NS) NIC NS NIC NS NIC NS NIC NIC NS NIC NS NIC NS The Network Interface Card (NIC) and Networking Software (NS) must be compatible with each other and with the computer or device into which they are installed. Network Hub or Wiring Center Shared Laser Printer Shared Application Server Media 65 Ethernet MAC addresses Every Ethernet interface (NIC) has a 6‐byte physical address or MAC (medium access control) address assigned and burned into the interface hardware when it is manufactured. MAC address is like a serial number. MAC address of every Ethernet device is guaranteed to be globally unique. 66
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IT 263 & TDC 405 ‐ Autumn 2018 19 Sept 2018 Dr. Oteafy © 2018 34 MAC Address: Ethernet Identity Layer 2 Ethernet MAC address is a 48‐bit binary value expressed as 12 hexadecimal digits. IEEE requires vendor to follow 2 simple rules: Must use vendor's assigned OUI as first 3 bytes. All MAC addresses with the same OUI must be assigned a unique value in last 3 bytes. 67 MAC Address Representations 68
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IT 263 & TDC 405 ‐ Autumn 2018 19 Sept 2018 Dr. Oteafy © 2018 35 They have three main “classes” of recipients When Hosts talk in a Subnet Unicast MAC Address 70
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IT 263 & TDC 405 ‐ Autumn 2018 19 Sept 2018 Dr. Oteafy © 2018 36 Broadcast MAC Address 71 Multicast MAC Address 72
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IT 263 & TDC 405 ‐ Autumn 2018 19 Sept 2018 Dr. Oteafy © 2018 37 GOOD NIGHT, SEE YOU NEXT WEEK Questions?
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IT 263 & TDC 405 ‐ Autumn 2018 26 Sept 2018 Dr. Oteafy © 2018 1 IT 263 & TDC 405
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