TAILIEUCHUNG - CompTIA Network+ Certification Study Guide part 36

CompTIA’s Network+ certification Study Guide part 36 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. | 336 CHAPTER 7 TCP IP and Routing HEAD OF THE CLASS. Network Exam is Focused on TCP IP . Period. For those of you taking the Network exam you will need to know TCP IP in detail. It s the most commonly used protocol today and the most tested on the exam. On the Network exam the term IPX SPX as well as the others will come up a lot so it may appear as if many questions are on IPX SPX AppleTalk or NetBEUI. It s important to understand that many times in this scenario you are being asked fundamental knowledge that was already acquired earlier in this chapter such as the fact that IPX SPX uses NLSP as a Dynamic Routing Protocol whereas TCP IP will use something such as OSPF. NLSP is an IPX SPX-based Dynamic Routing Protocol whereas OSPF is a TCP IP-based one. Most of the exam is focused on details about TCP IP so don t get too upset that you see IP-based protocols covered here in depth whereas others are not. How Packets Travel from Network to Network Let s look at how a data packet from one host travels to another across the span of networks. After a sending host receives the needed IP address the packet is sent from the host through the TCP IP suite to the physical medium for delivery at the target IP address. Routing is the process of sending the packet to its destination. A router is a device that forwards packets from one network to another and is also referred to as a gateway the term gateway is used in several different contexts in all cases a gateway connects one thing with another . When the sending host has a packet ready it already has determined the destination s IP address by using one of the many name-to-IP resolution methods discussed. However it may not know where that IP address is located if it is not located on the same subnet as the sending host. When TCP IP on a host is initialized it automatically creates a routing table which consists of default entries manual entries and entries made automatically through communication with network routers. To .

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