tailieunhanh - CompTIA Network+ Certification Study Guide part 17

CompTIA’s Network+ certification Study Guide part 17 is a globally-recognized, vendor neutral exam that has helped over 235,000 IT professionals reach further and higher in their careers. The 2009 Network+ exam (N10-004) is a major update with more focus on security and wireless aspects of networking. Our new study guide has been updated accordingly with focus on network, systems, and WAN security and complete coverage of today’s wireless networking standards. | 146 CHAPTER 3 Network Devices Q I need a star network using Ethernet standards with enhanced performance. What type of network device do I require A A switch. A switch is similar to a hub in that it will take data from one cable regenerate the signal and then resend it. What makes a switch different is that it will take the data sent to one port on the switch and then determine which of the other ports will allow the data to get to its intended destination. Q I have an ISDN connection installed to my business. What is required for me to communicate on the ISDN medium A ISDN modems are required to transmit local data packets onto the ISDN line and to receive the data packets from the ISDN connection and transmit them on the local network. Q My company has a firewall. Do I need to worry about worms or similar attacks A Yes. Many users these days have laptop computers that are connected to a number of different networks. Each new network is a new vector for worm attack. Many companies stand to face outages caused by worms brought in on employee laptops. SELF TEST 1. Cables from workstations are connected to a central network connectivity device that takes data from one port and resends it to all of the other ports. In doing so the data is regenerated so it is as strong as when it was originally sent. Which of the following devices is being used A. Active hub B. Passive hub C. Switching hub D. Switch 2. Your network consists of a single large LAN that is in a star topology configuration. You have found that there are a significant number of collisions occurring on the network and want to segment it into two smaller LANs. Which of the following devices will you use to segment this network allowing each LAN to communicate with the other A. NIC B. MAU Self Test 147 C. Bridge D. Repeater 3. You want to get Internet access for a computer that is used by the IT staff to download drivers and updated software from the Internet. Because of the amount of data that is going to be