EE450-U3-Addressing-Nazarian-Summer11

EE450-U3-Addressing-Nazarian-Summer11 - EE450 Computer...

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EE450 Computer Networks Network Addressing ARP DNS, and DHCP Shahin Nazarian Summer 2011
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Shahin Nazarian/EE450/Summer 2011 TCP/IP Addressing 2 Processes Application Layer TCP UDP IP Underlying Physical Networks Transport Layer Network Layer Data Link Layer Physical Layer ________ Address IP (________) Address MAC (________) Address
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Shahin Nazarian/EE450/Summer 2011 TCP/IP Addressing – Physical Address 3 levels of addressing are required. The addresses go into the headers Physical address (aka DLC address or _____ address ) DLC stands for Data Link Control , MAC stands for Medium Access Control MAC address is the physical address of NIC Example: A node (sender) with physical address 10 sends a frame to a node (receiver) with physical address 87 . The two nodes are connected by a link (bus topology LAN) 3
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Shahin Nazarian/EE450/Summer 2011 TCP/IP Addressing – Physical Address The MAC address ________ the address of the computer, _______ the address of its card. MAC address is globally unique. It’s unchangeable; burnt into the NIC when manufactured Reminder: If a computer that is connected to a network needs to be connected to a different network (technology), that computer needs a new NIC [which has a different MAC address], e.g., wireless NIC and Ethernet NICs are __________ If a computer is connected to an Ethernet and needs to be connected to another Ethernet, there is no need to change the NIC, as the NIC can be recognized by the new Ethernet via NIC’s global address 4
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Shahin Nazarian/EE450/Summer 2011 TCP/IP Addressing – Physical Address If the user moves his/her computer from one network to another, the IP address of that computer needs to change, because networks have different logical (IP) addresses Note that the physical address or MAC address is in layer 2 or Data Link layer (aka MAC layer ); ___ in the Physical layer Question: What header, MAC address goes into? _______ The ___ bits of physical address are divided into six 8-bits (or 6 bytes, or 6 chunks) each of which represented by a two digit hexadecimal number, e.g., 25:A2:17:CF:29:7D Incomplete delivery – Example: You mail your friend a letter and it gets to the apartment management office. This is an incomplete delivery. Delivery will be complete when the mail is finally delivered by the office to your friend Physical Address 48 bits long 5
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Shahin Nazarian/EE450/Summer 2011 TCP/IP Addressing – IP Address IP Address 32 bits long (IP-v4) [128bits in IP-v6]
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Shahin Nazarian/EE450/Summer 2011 TCP/IP Addressing – IP Address Question: Is the delivery of the packet to the network layer a complete delivery or an incomplete one? It is an incomplete delivery; the message has to be delivered all the way to the host ( ________ ) Question: Do all hosts on the same network have to have an identical network address? Yes, but can they have the same host address? No, not at the same time The maximum number of IP addresses in IP-v4 is 2 ___ or 4 billion, which means we may run out of IP addresses soon http://www.computerworld.com/s/article/9191518/ Final_IPv4_addresses_to_be_issued_within_months_NRO_warns
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EE450-U3-Addressing-Nazarian-Summer11 - EE450 Computer...

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