how to insert barcode in excel 2007 SECTION 25 ADDRESSING in Software

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User Datagram Protocol
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The User Datagram Protocol (UDP) is the simpler of the two standard TCPIIP transport protocols It is a process-to-process protocol that adds only port addresses, checksum error control, and length information to the data from the upper layer UDP is discussed in 23
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Transmission Control Protocol
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The Transmission Control Protocol (TCP) provides full transport-layer services to applications TCP is a reliable stream transport protocol The term stream, in this context, means connection-oriented: A connection must be established between both ends of a transmission before either can transmit data At the sending end of each transmission, TCP divides a stream of data into smaller units called segments Each segment includes a sequence number for reordering after receipt, together with an acknowledgment number for the segments received Segments are carried across the internet inside of IP datagrams At the receiving end, TCP collects each datagram as it comes in and reorders the transmission based on sequence numbers TCP is discussed in 23
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The Stream Control Transmission Protocol (SCTP) provides support for newer applications such as voice over the Internet It is a transport layer protocol that combines the best features of UDP and TCP We discuss SCTP in 23
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The application layer in TCPIIP is equivalent to the combined session, presentation, and application layers in the OSI modeL Many protocols are defined at this layer We cover many of the standard protocols in later chapters
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Four levels of addresses are used in an internet employing the TCP/IP protocols: physical (link) addresses, logical (IP) addresses, port addresses, and specific addresses (see Figure 217)
Figure 217 Addresses in TCPIIP
Addresses
Physical addresses
Logical addresses
Port addresses
Specific addresses
NETWORK MODELS
Each address is related to a specific layer in the TCPIIP architecture, as shown in Figure 218
Figure 218 Relationship of layers and addresses in TCPIIP
Appli"tio" I,,",
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Specific
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Port
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Network layer
IPand other protocols
Logical addresses
Data link layer Underlying physical networks Physical addresses
Physical layer
Physical Addresses
The physical address, also known as the link address, is the address of a node as defined by its LAN or WAN It is included in the frame used by the data link layer It is the lowest-level address The physical addresses have authority over the network (LAN or WAN) The size and format of these addresses vary depending on the network For example, Ethernet uses a 6-byte (48-bit) physical address that is imprinted on the network interface card (NIC) LocalTalk (Apple), however, has a I-byte dynamic address that changes each time the station comes up
Example 21
In Figure 219 a node with physical address 10 sends a frame to a node with physical address 87 The two nodes are connected by a link (bus topology LAN) At the data link layer, this frame contains physical (link) addresses in the header These are the only addresses needed The rest of the header contains other information needed at this level The trailer usually contains extra bits needed for error detection As the figure shows, the computer with physical address lOis the sender, and the computer with physical address 87 is the receiver The data link layer at the sender receives data from an upper layer It encapsulates the data in a frame, adding a header and a trailer The header, among other pieces of information, carries the receiver and the sender physical (link) addresses Note that in most data link protocols, the destination address, 87 in this case, comes before the source address (10 in this case) We have shown a bus topology for an isolated LAN In a bus topology, the frame is propagated in both directions (left and right) The frame propagated to the left dies when it reaches the end of the cable if the cable end is terminated appropriately The frame propagated to the right is
SECTION 25
ADDRESSING
Figure 219 Physical addresses
Sender Receiver
_ _ 28
53 _ _
Destination address does not match; the packet is dropped
sent to every station on the network Each station with a physical addresses other than 87 drops the frame because the destination address in the frame does not match its own physical address The intended destination computer, however, finds a match between the destination address in the frame and its own physical address The frame is checked, the header and trailer are dropped, and the data part is decapsulated and delivered to the upper layer
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