An Introduction to Security Zones
Although the security features available in the various networking devices play an important part in thwarting network attacks, in reality one of the best defenses against network attacks is the network's secure topological design. A network topology designed with security in mind goes a long way in forestalling network attacks and allowing the security features of the various devices to be most effective in their use. One of the most critical ideas used in modern secure net..
Mutual Redistribution at Multiple Routers
When multiple routers redistribute between the same two routing protocol domains, several potentialproblems can occur. One type of problem occurs on the redistributing routers, because thoserouters will learn a route to most subnets via both routing protocols. That router uses the AD todetermine the best route when comparing the best routes from each of the two routing protocols;this typically results in some routes using suboptimal paths. For example, Figure 11-4 shows asamp..
The ultimate solution to rapidly growing Internet routing tables and IPv4 address depletion was the development of IPv6, which defines 128-bit source and destination addresses. At the risk of being derided 20 years from now, I’ll venture a guess that IPv6 has more addresses than we’ll ever need. IPv6 can support over a trillion, trillion IP addresses per person on the planet—with plenty of publicly routable addresses for everyone. Plus, the structure is well established..
Sometimes, the Cisco enable or secret password is unknown and thus you must use password recovery to attain or change the enable or secret password. Password recovery allows the network administrator to recover a lost or unknown password on a Cisco router. For password recovery, an administrator must have physical access to the router through the console or auxiliary port. When an EXEC user enters an incorrect enable password, the user receives an error message similar to th..
Configuring Cisco routers to use BGP Communities is a two-step process. You must specify the desired Community values by using a route map associated with a neighbor command: Router3#configure terminal Enter configuration commands, one per line. End with CNTL/Z. Router3(config)#ip prefix-list 10.101/16 seq 5 permit 10.101.0.0/16 Router3(config)#ip prefix-list 10.102/16 seq 5 permit 10.102.0.0/16 Router3(config)#ip prefix-list 10.103/16 seq 5 permit 10.103.0.0/16 Router..
