Although it is possible to have a router attach to more than three areas, the Cisco Technical Assistance Center (TAC) recommends that a greater number of areas be created only after careful consideration. The results of having more areas will vary depending on the router (memory and CPU), as well as network topology and how many LSAs are generated. Various sources recommend that the number of routers per area not exceed 40 to 80; however, this is a rough guideline and not a s..
AppleTalk Routing Configuration
The assignment of AppleTalk network numbers and zone names to IOS devices and interfaces is necessary but not sufficient for AppleTalk devices to communicate with each other. To pass data back and forth, the workstations and servers on the AppleTalk network also must know which paths to take to reach one another. AppleTalk routers build and refer to tables of network numbers, which are known as routing tables. The AppleTalk routing tables operate much like IP routing tables, ..
Network-Based Intrusion Detection Systems
You will be forgiven for looking at this new blueprint objective and wondering what exactly is to be expected of a candidate taking the new CCIE Security written exam. This section unravels this objective and provides you with the best preparation possible to ensure that you pass this portion of the exam on your first attempt. Network-based intrusion detection has been defined by many security vendors, such as Cisco, which has defined IDS as a method of detecting an illegal ..
AutoQoS is an extremely useful feature that can take a lot of the mystery out of building a QoS policy. Unfortunately, there are several restrictions on this feature that you need to be aware of. First, it is only available on point-to-point links between routers. This includes point-to-point subinterfaces on ATM and Frame Relay PVCs, as shown in the example. The feature is also available on PPP and HDLC Serial connections. It cannot be used on any multiple access media, inc..
Local Significance Approach to DLCI Assignment
Earlier chapters discussed the concept of DLCI local significance. In the context of local significance on a Frame Relay network, the end devices at two different ends of a connection can use a different DLCI to refer to that same connection. This section discusses setting up a Frame Relay DLCI addressing scheme using the local significance approach to DLCI assignment. Later in the section, an alternate addressing scheme using the global significance approach is examined. Glo..
