Not-So-Stubby Areas

Since stub areas cannot carry external routes, type 5 advertisements are not allowed in stub areas. Since type 5 LSAs are not allowed in stub areas, ASBRs cannot be located in stub areas. The problem is that sometimes the best solution to a design problem is to allow external routes. This problem is...

Subnetting a Classful Network Number

With classful addressing, and no subnetting, an entire class A, B, or C network is needed on each individual instance of a data link. For example, Figure 4-1 shows a sample internetwork, with dashed-line circles representing the set of hosts that must be in the same IP network

Logging Unauthorized SNMP Attempts

Use the following commands to configure your router to log unauthorized SNMP requests: Router#configure terminal Enter configuration commands, one per line.  End with CNTL/Z. Router(config)#access-list 99 permit 172.25.1.0 0.0.0.255 Router(config)#access-list 99 permit host 10.1.1.1 Route...

Using Better Password-Encryption Techniques

Cisco introduced the enable secret password to improve the security of the enable password command. This command uses the cryptographically strong MD5 algorithm to encrypt passwords. It it extremely difficult to crack this algorithm. In fact, there are no known ways to uniquely reverse MD5 encrypti...

Load-Balancing

Although BGP goes to great lengths to ensure that there is only one path for each route by default, Cisco routers also allow you to configure load-balancing for equal cost paths: Router1#configure terminal Enter configuration commands, one per line.  End with CNTL/Z. Router1(config)#router...

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