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12 Determine which of the following is an FQDN and which is a PQDN a xxx b xxxyyy c xxxyyynet d zzzyyyxxxedu 13 Determine which of the following is an FQDN and which is a PQDN a mil b edu c xxxyyynet d zzzyyyxxxedu 14 Which domain is used by your system, generic or country 15 Why do we need a DNS system when we can directly use an IP address 16 To find the IP address of a destination, we need the service of DNS DNS needs the service of UDP or TCP UDP or TCP needs the service of IP IP needs an IP destination address Is this a vicious cycle here 17 If a DNS domain name is voyagerfhdaedu, how many labels are involved here How many levels of hierarchy 18 Is a PQDN necessarily shorter than the corresponding FQDN 19 A domain name is hello customer info Is this a generic domain or a country domain 20 Do you think a recursive resolution is normally faster than an interactive one Explain 21 Can a query message have one question section but the corresponding response message have several answer sections
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Remote Logging, Electronic Mail, and File Transfer
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The main task of the Internet is to provide services for users Among the most popular applications are remote logging, electronic mail, and file transfer We discuss these three applications in this chapter; we discuss another popular use of the Internet, accessing the World Wide Web, in 27
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In the Internet, users may want to run application programs at a remote site and create results that can be transferred to their local site For example, students may want to connect to their university computer lab from their home to access application programs for doing homework assignments or projects One way to satisfy that demand and others is to create a client/server application program for each desired service Programs such as file transfer programs (FTPs), e-mail (SMTP), and so on are currently available However, it would be impossible to write a specific client/server program for each demand The better solution is a general-purp<Dse client/server program that lets a user access any application program on a remote computer; in other words, allow the user to log on to a remote computer After logging on, a user can use the services available on the remote computer and transfer the results back to the local computer
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In this section, we discuss such a client/server application program: TELNET TELNET is an abbreviation for TErminaL NETwork It is the standard TCP/IP protocol for virtual terminal service as proposed by the International Organization for Standards (ISO) TELNET enables the establishment of a connection to a remote system in such a way that the local terminal appears to be a terminal at the remote system
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TELNET is a general-purpose client/server application program
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Timesharing Environment
TELNET was designed at a time when most operating systems, such as UNIX, were operating in a timesharing environment In such an environment, a large computer supports multiple users The interaction between a user and the computer occurs through a terminal, which is usually a combination of keyboard, monitor, and mouse Even a microcomputer can simulate a terminal with a terminal emulator
Logging
In a timesharing environment, users are part of the system with some right to access resources Each authorized user has an identification and probablY,a password The user identification defines the user as part of the system To access the system, the user logs into the system with a user id or log-in name The system also includes password checking to prevent an unauthorized user from accessing th~ resources Figure 261 shows the logging process
Figure 261 Local and remote log-in
Application programs
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