Network security is the process through which a network is secured against internal and external threats of various forms. In order to develop a thorough understanding of what network security is, you must understand the threats against which network security aims to protect a network. It is equally important to develop a high-level understanding of the main mechanisms that can be put into place to thwart these attacks. Generally, the ultimate goal of implementing security o..
Cisco IOS software release 12.0 made it possible for you to configure a remote router as an EIGRP stub router. Stub routers in EIGRP networks use EIGRP to send limited information between the stub and the core routers. A stub router is typically used on routers to minimize memory and processor utilization; as such it is a good candidate for slow routers with minimal memory. The stub router has only one neighbor, a distribution layer router. The remote router onl..
The core is the first place in your network where scaling issues will become apparent. This is because the core tends to combine the largest number of routes with the largest amount of traffic, taxing the routers to their limit. Using BGP in the core allows the routes in the core to separated into two parts: routes within the core and routes external to the core. The iBGP mesh carries the routes external to the core, while the IGP continues to carry just the routes within th..
Using SNMP to Extract Inventory Information from a List of Routers
The following Perl script extracts important router informationsuch as router name, physical location, contact name, and serial number from a list of routersand creates a report of this information. The script is intended to be run manually, and no arguments are required or expected. Here's some example output: Freebsd% ./inventory.pl Router Location ..
There are several different LMI options. The first specifies which version of LMI protocol you wish to use: Branch1#configure terminal Enter configuration commands, one per line. End with CNTL/Z. Branch1(config)#interface Serial0 Branch1(config-if)#encapsulation frame-relay Branch1(config-if)#frame-relay lmi-type ansi Branch1(config-if)#exit Branch1(config)#end Branch1# By default, LMI sends keepalive packets through every PVC every 10 seconds to verify that the path ..
