TCP IP Illustrated

147 what is a problem with maintaining the cache in

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Unformatted text preview: istrators update their DNS files whenever changes are made to the list of root servers. (Changes do occur to the list of root servers, but not frequently.) How do you think the DNS handles this? 14.6 Fetch the file specified in Exercise 1.8 and determine who is responsible for maintaining the root name servers. How frequently are the root servers updated? 14.7 What is a problem with maintaining the cache in the name server, and having a stateless resolver? 14.8 In the discussion of Figure 14.10 we said that the name server sorts the A records so that addresses on common networks appear first. Who should sort the A records, the name server or the resolver? file:///D|/Documents%20and%20Settings/bigini/Docu.../homenet2run/tcpip/tcp-ip-illustrated/dns_the.htm (18 of 18) [12/09/2001 14.47.06] Chapter 15. TFTP: Trivial File Transfer Protocol TFTP: Trivial File Transfer Protocol 15.1 Introduction TFTP is the Trivial File Transfer Protocol. It is intended to be used when bootstrapping diskless systems (normally workstations or X terminals). Unlike the File Transfer Protocol (FTP), which we describe in Chapter 27 and which uses TCP, TFTP was designed to use UDP, to make it simple and small. Implementations of TFTP (and its required UDP, IP, and a device driver) can fit in read-only memory. This chapter provides an overview of TFTP because we'll encounter it in the next chapter with the Bootstrap Protocol. We also encountered TFTP in Figure 5.1 when we bootstrapped the host sun from the network. It issued a TFTP request after obtaining its IP address using RARP. RFC 1350 [Sollins 1992] is the official specification of version 2 of TFTP. Chapter 12 of [Stevens 1990] provides a complete source code implementation of a TFTP client and server, and describes some of the programming techniques used with TFTP. 15.2 Protocol Each exchange between a client and server starts with the client asking the server to either read a file for the client or write a file for the client. In the normal case of bootstrapping a di...
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This test prep was uploaded on 04/04/2014 for the course ECE EL5373 taught by Professor Guoyang during the Spring '12 term at NYU Poly.

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