200-301 wendell odom

200-301 wendell odom

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There are three types of IP addresses: unicast addresses (the purpose is a single host), broadcast addresses (the destination is all hosts on a given network), and multicast addresses (the destination is all hosts in the same group). The first 12 and Chapter 13 chapter will discuss more details of the broadcast and multicast. Both frame formats use 48-bit ( 6- byte) destination and source addresses ( 802.3 allows 16-bit addresses, but is generally a 48-bit address). This is what we call the hardware address in this book. ARP and RARP protocol (the first 4 and Section 5 Section) of 32 bit in the IP address and a 48 bit hardware address mapping. When a system with a local disk is booted, the IP address is generally read from a configuration file on the disk . But diskless machines, such as X terminals or diskless workstations, need to use other methods to obtain IP addresses. If we check the port numbers of these standard simple services and other standard TCP / IP services (such as Telnet , FTP , SMTP, etc.), we find that they are all odd numbers. This is for historical reasons, because these port numbers are derived from NCP port numbers ( NCP , which is the network control protocol, is the transport layer protocol of AR PA NET and is the precursor of TCP ). NCP is simplex,200-301 wendell odom, not full-duplex, so each application requires two connections, and a pair of odd and even port numbers need to be reserved. When TCP and UDP became standard transport layer protocols, each application needed only one port number, so the odd number in NCP was used . Figure 1-11    book all examples run the test network, all IP addresses are from 140.

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