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Also called the Network Layer or Internet Layer, Layer 3 is the step in the communication process during which a source and destination software address is added to the packet and during which the packet is routed to the remote network destination beyond the earshot of a physical signal. The main protocol that operates at Layer 3 is IP, and the device that operates at this layer is a router. Routers stop physical propagations (broadcasts) of messages on a network, read the software address assigned in Layer 3 of a packet, and then forward the message along an appropriate pathway toward its destination. Layer 3 is where the main changes have appeared in Microsoft s new implementation of TCP/ IP. Traditionally, IPv4 is the only protocol to appear at this layer. In the Next Generation TCP/ IP stack, however, the IPv4 and IPv6 protocols now co-occupy Layer 3.
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IPv4, or simply IP, is responsible for addressing and routing packets between hosts that might be dozens of network segments away. IPv4 relies on 32-bit addresses, and because of this relatively small address space, addresses are rapidly becoming depleted in IPv4 networks. IPv6 IPv6 uses 128-bit addresses instead of the 32-bit addresses used with IPv4, and, as a result, it can define many more addresses. Because few Internet routers are IPv6 compatible, IPv6 today is used over the Internet with the help of tunneling protocols. However, IPv6 is supported natively in Windows Vista and Windows Server 2008 LANs.
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Both IPv4 and IPv6 are enabled by default. As a result of this dual-IP architecture, computers can use IPv6 to communicate if the client, server, and network infrastructure support it but also communicate with computers or network services that support only IPv4.
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Layer 4, or the Transport Layer of the TCP/IP model, is the step in the communication process during which the terms of sending and receiving data are determined. Layer 4 also serves to tag data as being destined for a general application, such as e-mail or the Web.
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TCP and UDP are the two Transport Layer protocols within the TCP/IP suite.
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TCP TCP receives data from the Application Layer and processes the data as a stream of bytes. These bytes are grouped into segments that TCP then numbers and sequences for delivery to a network host. TCP acknowledges received data and arranges for data to be resent when such an acknowledgment is not received.
When TCP receives a stream of data from a network host, it sends the data to the application designated by the TCP port number. TCP ports enable different applications and programs to use TCP services on a single host, as shown in Figure 1-6. Each program that uses TCP ports listens for messages arriving on its associated port number. Data sent to a specific TCP port is thus received by the application listening at that port.
FTP server TCP ports 20, 21 Telnet server TCP port 23 Web server TCP port 80
Figure 1-6
TCP ports
UDP Many network services (such as DNS) rely on UDP instead of TCP as a transport protocol. UDP enables fast transport of datagrams by eliminating the reliability features of TCP, such as delivery guarantees and sequence verification. Unlike TCP, UDP is a connectionless service that provides only best-effort delivery to network hosts. A source host that needs reliable communication must use either TCP or a program that provides its own sequencing and acknowledgment services.
Layer 7
Layer 7, or the Application Layer of the TCP/IP model, is the step in the communication process during which end-user data is manipulated, packaged, and sent to and from Transport Layer ports. Application Layer protocols often describe a user-friendly method of presenting, naming, sending, or receiving data over TCP/IP. Common examples of Application Layer protocols native to the TCP/IP suite include HTTP, Telnet, FTP, Trivial File Transfer Protocol (TFTP), Simple Network Management Protocol (SNMP), DNS, Post Office Protocol 3 (POP3), Simple Mail Transfer Protocol (SMTP), and Network News Transfer Protocol (NNTP).
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