Alternatives to the OSPF Network Command
As of Cisco IOS Software Release 12.3(11)T, OSPF configuration can completely omit the network command, instead relying on the ip ospf process-id area area-id interface subcommand. This new command enables OSPF on the interface and selects the area. For instance, on R3 in Example 10-8, the network 10.3.0.0 0.0.255.255 area 3 command could have been deleted and replaced with the ip ospf 1 area 3 command under S0/0.1 and e0/0. The network and ip ospf area commands have some mi..
Collocation is the act of placing one party's equipment on another party's premises. An example of collocation is putting the customer's router at the provider's site or hosting center, as illustrated in Figure 2-12. The customer motivations for such a collocation scheme would be to have the ISP provide faster access speeds or local monitoring of the equipment, or perhaps to give the customer better control of access bandwidth utilization. Figure 2-12. Collocation Example: Cu..
Calculating Classfully Assumed Network Ranges
A common task in addressing is to take an IP address and to understand the range of addresses that are on the same network. Originally, this was done by reading the first bits of the address to determine a class; this is called classful addressing. The portion of the address consumed by the network prefix was then assumed, based on that class. Table 2-2 shows the first bits of an IP address, the corresponding classes, and the number of bytes assumed to be in the network..
If you take the previous binary number and write it down in groups of three—add two 0s on the left—you might notice something: 001 101 100 101 110 011 Each grouping of three bits has a value between 0 and 7. (See Table 2-1.) If you could represent each set of three bits with one symbol, life might be a bit (get it?) easier. How many symbols will you need? The answer is eight. We already have eight symbols we are familiar with (0–7), so let's use them. Counting to 135 us..
The value proposition of a network is that it ties together different entities and enables exchange of information. The network's value is also directly related to its size. The more entities that are connected and partake in the network, the higher the impact of the network is. For exchange and scaling to occur in a relevant and orderly manner, the connected entities must use the same language. As such, standards form an integral component of networks because they enforce or..
