Using Metrics and Metric Types to Influence Redistributed Routes
A different set of issues can occur for a router that is internal to a single routing domain, like R4and R5 in Figure 11-4. The issue is simple—with multiple redistributing routers, an internal routerlearns multiple routes to the same subnet, so it must pick the best route. As covered earlier in thechapter, the redistributing routers can set the metrics; by setting those metrics with meaningfulvalues, the internal routers can be influenced to use a particular redistribution..
The exchange of data in an 802.11 network is bidirectional between the radio card and access point. As mentioned earlier, data frames in an infrastructure wireless LAN do not travel directly between wireless users. Instead, the access point relays the data. A radio card or access point (802.11 station) having the destination MAC address of the data frame replies with an acknowledgement (ACK) frame. This adds significant overhead to a wireless LAN as compared to an Ethernet n..
The primary components of a wireless LAN include radio cards and access points, which operate at Layers 1 and 2 of the network architecture. Some wireless LAN components, however, include higher-layer functionality. A wireless LAN router, for instance, includes network layer functions, such as DHCP and NAT. The sections that follow take a closer look at each of the following components that comprise a wireless LAN: ■ Radio cards ■ Access points ■ Antennas ■ Repeaters ..
This section covers the concepts behind four separate methods for finding the RP. Three are specific configuration features, namely static configuration, Auto-RP, and BSR. The fourth, Anycast RP, actually uses any of the first three methods, but with the design that includes having the RPs use the same unicast IP address to achieve better redundancy features. Table 20-3 summarizes the methods of finding the RP with PIM-SM. Table 20-3 Comparison of Methods of Finding the RP
As a designer of secure networks, one of the first things you must consider is the vast interdependency of today's larger networks. The Internet is the best example, but within each organization there exists a microcosm of the Internet. From an attacker's perspective, these interdependencies allow for the attacker's goals to be met in any number of ways. As an example, assume an attacker wants to bring down your website. The following list outlines the attacker's options: ..
