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Subnet Mask
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A B C Table 5-6
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255000 25525500 2552552550 Classes of Networks
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Subnet Mask (Decimal) Subnet Mask (Binary) CIDR Notation Number of Nodes
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255255255254 255255255252 255255255248 255255255240 255255255224 255255255192 255255255128 2552552550 Table 5-7
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Classless Network Subnet Masks
A more rapid way of expressing an IP address with its accompanying subnet mask has been developed, where the number of bits in the subnet mask follows the IP address after a slash For example, the IP address 1412041315/26 means the subnet mask is the first 26 bits (in binary) of the IP address, or 255255255192 This is easier than expressing the IP address and subnet mask separately Special IP Address Other IP addresses are used in the IP protocol that have not been discussed thus far These other addresses and their functions are: Loopback The IP address 127001 (or any other address in the entire 127 address block) is a special loopback address that is analogous to earlier technologies where a physical loopback plug would be connected to a network connector in order to confirm communications within a system or device The 127001 loopback address serves the same function If a system attempts to connect to a system at IP address 127001, it is essentially communicating with itself A system that is able to connect to itself through its loopback address is testing its IP protocol drivers within the operating system; during network troubleshooting, it is common to issue a ping 127001 or similar command to verify whether the IP software is functioning correctly Broadcast The highest numeric IP address in an IP subnet is called its broadcast address When a packet is sent to a network s broadcast address, all active stations on the network will logically receive and potentially act on the incoming message For example, in the network 14120413/24, the broadcast address is 14120413255 Any packet sent to that address would be sent to all stations A ping command sent to a network s broadcast address will cause all stations to respond with an echo reply
Transport Layer Protocols
The two principal protocols in TCP/IP s transport layer are TCP and UDP The majority of Internet communications are based on these This section explores TCP and UDP in detail
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TCP and UDP support the two primary types of Internet-based communication: that which requires highly reliable and ordered message delivery, and that which has a high tolerance for lost messages TCP and UDP are uniquely designed for these two scenarios TCP TCP is a highly reliable messaging protocol that is used in situations where high-integrity messaging is required The main characteristics of TCP-based network traffic are: Unique connections The TCP protocol utilizes what is known as a connection between two stations It supports several concurrent connections between any two stations Guaranteed message integrity The TCP protocol performs checks on the sent and received packets to ensure that the packet arrived at its destination fully intact If the checksum indicates that the packet was altered in transit, the TCP protocol will handle retransmission Guaranteed delivery The TCP protocol guarantees message delivery This means that if an application sends a message to another application over an established TCP connection and the function sending the message receives a success code from the operating system, then the message was successfully delivered to the destination system This is contrasted with the message delivery used by UDP that is discussed later in this section Guaranteed delivery sequence Packets sent using the TCP protocol include sequence numbers so that the destination system can assemble arriving packets into the correct order This guarantees that an application receiving packets from a sending application over TCP can be confident that packets are arriving in the same order in which they were sent UDP UDP is a lightweight messaging protocol used in situations where speed and low overhead are more important than guaranteed delivery and delivery sequence Unlike the connection-oriented TCP protocol, UDP is connectionless This means that UDP does not need to set up a connection between sending and receiving systems before messages can be sent; instead, the sending system just sends its messages to the destination system Like TCP, messages can be sent to a specific port number on a destination system UDP does nothing to assure order of delivery Hence, it is entirely possible that packets may arrive at the destination system out of order In practice, this is a rarity, but the point is that UDP does not make any effort to reassemble packets into their original order upon arrival Furthermore, not only does UDP not guarantee the sequence of delivery, but it also does not even guarantee that the destination system will receive a packet In UDP, when an application sends a message to a target system, the success error code returned by
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