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Labs 5,6,7,9 of Boson NetSim

Labs 5,6,7,9 of Boson NetSim. Lab 5 – Saving Router Configuration. What is the config ?!! Contains commands that are executed when the device starts up Subject to back up, restore, FTP, … Running config is internally not a file, but generates corresponding file when persisted

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Labs 5,6,7,9 of Boson NetSim

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  1. Labs 5,6,7,9 of Boson NetSim

  2. Lab 5 – Saving Router Configuration • What is the config?!! • Contains commands that are executed when the device starts up • Subject to back up, restore, FTP, … • Running config is internally not a file, but generates corresponding file when persisted • Two kinds of configs • Running config • The configuration currently in effect • Resides in RAM • Volatile: lost if device is restarted unless saved to NVRAM • Startup config • The configuration that takes effect when device starts up • Resides in NVRAM (non-volatile RAM)

  3. Lab 5 – Saving Router Configuration

  4. Lab 6 – Cisco Discovery Protocol (CDP) • The Cisco Discovery Protocol (CDP) is a proprietary Data Link Layer protocol developed by CiscoSystems • It is used to share information about other directly connected Cisco equipment • such as the operating system version and IP address • CDP can also be used for On-Demand Routing, which is a method of including routing information in CDP announcements so that dynamic routing protocols do not need to be used in simple networks • Cisco devices send CDP announcements to the multicast destination address 01-00-0c-cc-cc-cc, out each connected network interface

  5. Lab 6 – Cisco Discovery Protocol (CDP) •  By default, CDP announcements are sent every 60 seconds on interfaces • Each Cisco device that supports CDP, stores the information received from other devices in a table that can be viewed using the show cdp neighborscommand • The CDP table information is refreshed each time an announcement is received, and the holdtime for that entry is reinitialized • The holdtime specifies the lifetime of an entry in the table, if no announcements are received from a device for a period in excess of the holdtime, the device information is discarded (default 180 seconds)

  6. Lab 6 – Cisco Discovery Protocol (CDP) • Receiving and processing CDP information is still supported • CDP support was replaced with IEEE 802.1AB Link Layer Discovery Protocol (LLDP), an IEEE standard that is implemented by multiple vendors and is functionally similar to CDP

  7. Lab 7 – Configuration Router Interface • Router>enable • Router#config terminal • Router(config)#interface serial 0/0/0 • Router(config-if)#ip address 10.10.10.1 255.255.255.0 • Router(config-if)#no shutdown • Router#showip interface brief

  8. Lab 9 – Router Remote Access via Telnet • Telnet is a network protocol(Application layer protocol) used on the Internet or local area networks to provide a bidirectional interactive text-oriented communication facility using a virtual terminalconnection • User data is interspersed in-band with Telnet control information in an 8-bit byte oriented data connection over the TCP • Telnet was developed in 1969 beginning with RFC 15, extended in RFC 854 • Telnet provided access to a command-line interface (usually, of an operating system) on a remote host

  9. Lab 9 – Router Remote Access via Telnet • Most network equipment and operating systems with a TCP/IP stack support a Telnet service for remote configuration • However, because of serious security issues when using Telnet over an open network such as the Internet, its use for this purpose has waned significantly in favor of SSH • a user will be telnetting to a Unix-like server system or a network device (such as a router) and obtaining a login prompt to a command line text interface or a character-based full-screen manager

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