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Unformatted text preview: les, with a fixed number of columns, but a variable
number of rows. Fundamental to SNMP is the identification scheme used to identify each row in a
table (when we don't know how many rows are in the table), and the lexicographic ordering
(column-row order). The end result, SNMP's get-next operator, is basic to any SNMP manager.
We then described the following groups of SNMP variables: system, interface, address translation,
IP, ICMP, TCP, and UDP. This was followed by two examples, one to determine the MTU of an
interface, and the other to look at the routing table of a router.
We completed the chapter by looking at SNMP traps, a way for the agent to notify the manager that
something significant has occurred, and a brief mention of ASN.1 and BER. These latter two topics
are probably the most confusing aspects of SNMP, but fortunately their details are needed only by
implementors. file:///D|/Documents%20and%20Settings/bigini/Doc...omenet2run/tcpip/tcp-ip-illustrated/snmp_sim.htm (32 of 33) [12/09/2001 14.47.40] Chapter 25. SNMP: Simple Network Management Protocol Exercises
25.1 We said that using two different ports (161 and 162) allows a system to run both a manager
and agent. What would happen if the same port number were used for both?
25.2 How would you list an entire routing table using get-next? file:///D|/Documents%20and%20Settings/bigini/Doc...omenet2run/tcpip/tcp-ip-illustrated/snmp_sim.htm (33 of 33) [12/09/2001 14.47.40] Chapter 26. Telnet and Rlogin: Remote Login Telnet and Rlogin: Remote Login
Remote login is one of the most popular Internet applications. Instead of having a
hardwired terminal on each host, we can login to one host and then remote login across the
network to any other host (that we have an account on, of course).
Two popular applications provide remote login across TCP/IP internets.
1. Telnet is a standard application that almost every TCP/IP implementation provides.
It works between hosts that use different operating sys...
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