1b_tcp_ip - CSE 6590 Winter 2012 Department of Computer...

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Unformatted text preview: CSE 6590 Winter 2012 Department of Computer Science & Engineering York University 1 02/14/12 15:03 OSI and TCP/IP Models 2 TCP/IP Encapsulation 3 (Packet) (Frame) TCP/IP Model and Example Protocols 4 A list of protocols used in TCP/IP: DNS FTP SMTP HTTP TCP UDP IP Application Transport Internet Network Access ARPANET SATNET Packet Radio LAN Physical TCP/IP Protocols 5 TCP/IP Addressing Port (or SAP) numbers of processes at source and destination IP addresses of source and destination Network interface card (NIC) addresses defined by the NIC 6 Port number IP address NIC address IP Addresses Each host in the Internet is identified by a globally unique IP address The IP address identifies the hosts network interface rather than the host itself (usually the host is identified by its physical address within a network). An IP address consists of two parts: network ID and host ID (more on formats of IP addresses later). IP addresses on the Internet are distributed in a hierarchical way. At the top of the hierarchy is ICANN (Internet Corporation for Assigned Names and Numbers). ICANN allocates blocks of IP addresses to regional Internet registries. There are currently three regional Internet registries that cover the Americas, Europe, and Asia. The regional registries then further allocate blocks of IP addresses to local Internet registries within their geographic region. Finally, the local Internet registries assign addresses to end users. Router: a node that is attached to two or more physical networks. Each network interface has its own IP address. 7 Physical Addresses On a physical network, the attachment of a device to the network is often identified by a physical address. The format of the physical address depends on the particular type of network. Example: Ethernet LANs use 48-bit addresses. Ethernet: protocol for bus LANs, originally designed by Xerox, later developed into IEEE 802.3 standard. Every machine in a LAN comes with a NIC that is assigned a physical address. 8 Physical Addresses (cont.) LANs (and other networks) assign physical addresses to the physical attachment to the network The network uses its own address to transfer packets or frames to the appropriate destination IP address needs to be resolved to physical address at each IP network interface Example: Ethernet uses 48-bit addresses...
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This note was uploaded on 02/14/2012 for the course CSE 6590 taught by Professor Kotakoski during the Winter '12 term at York University.

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1b_tcp_ip - CSE 6590 Winter 2012 Department of Computer...

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