Chapter 14

Networking

Figure 14.1  (a) A network of six hosts (b) An internetwork of four

networks

Figure 14.2  ISO and TCP/IP layered models, mapping between the two, and the general purpose of a group of layers

Figure 14.3  The TCP/IP protocol suite

Figure 14.4  IPv4 address classes

Table 14.1 IPv4 Address Classes and Valid IP Addresses

Figure 14.5  An internetwork of four networks with one class A, one class B, and two class C networks

Table 14.2 Top-Level Internet Domains

Figure 14.6  A portion of the Internet domain name hierarchy

Domain Address Lookup

Syntax nslookup [-option] [name | -] [server]

With no arguments, returns stats for current default NS

Other options for returning stats of specific servers, hosts within domain, etc

Table 14.3 Popular Internet Services and Corresponding Protocols

Figure 14.7  Depiction of the client–server software model

Common Remote Commands• rwho who’s logged in where in LAN• rusers who’s logged in• ruptime show status of hosts on LAN• ping test for echo from remote host• finger display info about user• rlogin remote login (LINUX/UNIX only)• telnet remote login (general)• ftp file transfer program• rcp remote copy• rsh remote shell• talk interactive chat program• traceroute displace details of route

Table 14.4 Commonly Used Telnet Commands

Figure 14.8  The semantics of the rsh upsun29 ps command

Figure 14.9 The semantics of the command:

rsh upsun29 sort students > sorted_students

Table 14.5 A Summary of Useful FTP Commands

Table 14.5 A Summary of Useful FTP Commands