The following steps configure an IOS device as a DHCP server: Step 1. Create a pool of addresses to assign to clients. The syntax for this command is: Router(config)#ip dhcp pool name Step 2. Assign a network to the pool: Router(config-dhcp)#network network/mask Step 3. Tell the client how long it can keep the address—this is called the lease period. Most DHCP implementations use a three-day lease, but IOS defaults to one day: Router..
Each 802.11 physical layer defines a set of RF channels. For example, the 802.11b/g standard defines 14 RF channels in the 2.4-GHz band, with varying numbers of these channels available in specific countries. In the United States, for instance, the FCC’s rules allow the use of only channels 1 through 11. In the case of 802.11b/g, these channels overlap with each other, as shown in Figure 22-7. As a result, companies installing 802.11b/g wireless LANs should set adjacent acc..
One way to deploy IS-IS onto a three-layer hierarchy is to configure the network core as a single L2 routing domain and place the distribution and access layers into various L1 domains, as needed. This design closely mimics an OSPF network with area 0 in the core and the distribution and access layers contained within areas connected to area 0, as Figure 5-3 illustrates. Figure 5-3. Pure D2 Core in Three-Layer Hierarchy The advantages and disadvantages of constraining the..
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: ..
An MPLS-based network consists of routers and switches interconnected via transport facilities such as fiber links (see Figure 1-1). Customers connect to the backbone (core) network through multiservice edge (MSE) routers. The backbone comprises the core routers that provide high-speed transport and connectivity between the MSE routers. An MSE router contains different types of line cards and physical interfaces to provide Layer 2 and Layer 3 services, including ATM, FR, Ethe..
