Assessing Your Readiness for Exam 310-044
In addition to the general exam-readiness information in the previous section, other resources are available to help you prepare for the exam. Two good sites are www.solariscentral.org and www.solarisguide.com. The tek-tips forum at www.
One last note : I can't stress enough the importance of hands-on experience in the context of exams. As you review the material for the exam, you'll realize that hands-on experience with Solaris 9 commands, tools, and utilities is invaluable.
Onward, Through the Fog!
After you've assessed your readiness, undertaken the right background studies, obtained the hands-on experience that will help you understand the products and technologies at work, and reviewed the many sources of information to help you prepare for the test, you'll be ready to take a round of practice tests. When your scores come back high enough to get you through the exam, you're ready to go for the real thing. The Introduction of this book includes information about obtaining vouchers and scheduling the exam. If you follow my assessment
Chapter 1. Local Area Networks
Terms you'll need to understand:
Concepts you'll need to master:
The first part of this chapter is a stepping stone to the rest of the book. It introduces some of the fundamental building blocks of a local area network (LAN) and the hardware used in creating one. The second part of this chapter concentrates on Ethernet, the most
The topology of a network refers to how the physical layout is organized ”that is, how the nodes on the network are physically wired together. Some topologies are cheaper to implement than others; some require more maintenance; and some have single points of failure, making them less reliable and robust. When designing a network, it is important to consider how big the network is going to be, the levels of traffic, and whether any failover requirements exist. Each of these aspects influences the decision of which topology to use. The following sections describe some of the more common topologies.
Figure 1.1. A bus configuration.
topology is the most common topology,
Figure 1.2. A star configuration.
The ring network is a configuration in which the hosts are connected in a loop. Each host is directly connected to its two adjacent hosts, one on either side. This topology offers slightly better resilience than bus or star topologies because a single failure results only in a degradation of the network; it takes two cable breaks, in separate segments, before any hosts become disconnected from the network. Figure 1.3 shows an example of a simple ring configuration.
Figure 1.3. A ring configuration.
Two rings can also be used to provide added resilience. The Fiber Distributed Data Interface (FDDI) is the most common example of this, in which the second ring continues to function if the primary ring fails.
Networks commonly use more than one topology because it is more practical and cost effective; this is called a mixed topology. For example, a department might use a bus configuration as its main backbone but have multiple star networks connecting the hosts in each section. In some colleges and universities, dual-ring networks, such as FDDI, are used as the backbone. Figure 1.4 shows how a mixed configuration may be used.
Figure 1.4. An example of a mixed configuration.
Virtual LAN Topologies
Virtual local area networks (VLANs) have become more popular, but they require the use of an
Figure 1.5. An example of a VLAN configuration.