EE450-U3-Addressing_Lecture-Nazarian-Summer10

EE450-U3-Addressing_Lecture-Nazarian-Summer10 - University...

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University of Southern California Viterbi School of Engineering EE450 omputer Networks Computer Networks etwork Addressing Network Addressing ARP DNS, DHCP Shahin Nazarian Summer 2010
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TCP/IP Addressing Processes Application Layer TCP UDP Transport Layer ________ Address IP Network Layer IP (________) Address Data Link Layer Underlying Physical Networks hysical MAC (________) Address Shahin Nazarian/EE450/Summer 2010 2 Physical Layer
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TCP/IP Addressing – Physical Address 3 levels of addressing are required. The addresses go into the headers hysical address ka LC address r address 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) Shahin Nazarian/EE450/Summer 2010 3
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TCP/IP Addressing – Physical Address The MAC address ________ the address of the computer, _______ the address of its card. MAC ddress is globally unique. It’s unchangeable; burnt 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 has a d fferent M address], e.g., w reless N 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 Shahin Nazarian/EE450/Summer 2010 4
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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 uestion: What header MAC address oes into? 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 Shahin Nazarian/EE450/Summer 2010 Physical Address 48 bits long 5
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TCP/IP Addressing – IP Address IP address (aka layer 3 address ) goes into the network header (nh) (i.e., packet header) and is for the purpose of packet delivery (which is an incomplete delivery ) to the Network layer. IP address is divided into two parts: The network address (________) hich is globally unique and the address of the host which is globally unique and the address of the host (__________) that is attached to the network IP address is configurable (software based,) meaning
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EE450-U3-Addressing_Lecture-Nazarian-Summer10 - University...

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