Chapter 2 Basic Concepts Line Configuration Topology Transmission Mode Categories of Networks Internetworks WCB/McGraw-Hill  The McGraw-Hill Companies, Inc., 1998

Figure 2-1 WCB/McGraw-Hill  The McGraw-Hill Companies, Inc., 1998

Figure 2-2 WCB/McGraw-Hill  The McGraw-Hill Companies, Inc., 1998 Point-to-Point Line Configuration

Figure 2-2-continued WCB/McGraw-Hill  The McGraw-Hill Companies, Inc., 1998 Point-to-Point Line Configuration

Figure 2-2-continued WCB/McGraw-Hill  The McGraw-Hill Companies, Inc., 1998 Point-to-Point Line Configuration

Figure 2-3 WCB/McGraw-Hill  The McGraw-Hill Companies, Inc., 1998 Multipoint Line Configuration

Figure 2-4 WCB/McGraw-Hill  The McGraw-Hill Companies, Inc., 1998

Figure 2-5 WCB/McGraw-Hill  The McGraw-Hill Companies, Inc., 1998 Mesh Topology

Modified by Dr Perry Xiao, LSBU, 2003 Advantages: Each connection carries its own data Robust Privacy and Security Easy fault identification and fault isolation Mesh Topology Disadvantages: The amount of cabling and the number of I/O ports required are high Difficult to install and reconfigure Expensive

Figure 2-6 WCB/McGraw-Hill  The McGraw-Hill Companies, Inc., 1998 Star Topology

Modified by Dr Perry Xiao, LSBU, 2003 Advantages: Less Expensive than mesh Easy to install and reconfigure Less cabling needed Robust Easy fault identification and fault tolerant Star Topology Disadvantages: Cabling required is more than tree, ring, or bus topologies

Figure 2-7 WCB/McGraw-Hill  The McGraw-Hill Companies, Inc., 1998 Tree Topology

Modified by Dr Perry Xiao, LSBU, 2003 Advantages: Generally the same advantages of star topology Allow more devices to be attached Allow network to isolate and prioritize communications from different computers Tree Topology Disadvantages: Generally the same disadvantages of star topology

Figure 2-8 WCB/McGraw-Hill  The McGraw-Hill Companies, Inc., 1998 Bus Topology

Modified by Dr Perry Xiao, LSBU, 2003 Advantages: Ease of installation Backbone cable can be laid along the most efficient path Less cabling than mesh, star or tree topologies Bus Topology Disadvantages: Difficult reconfiguration and fault isolation Difficult to add new devices A fault or break in the bus cable stops all transmission Damaged area reflects signals back and creating noises in both directions Possible delays in sending the data

Figure 2-9 WCB/McGraw-Hill  The McGraw-Hill Companies, Inc., 1998 Ring Topology

Modified by Dr Perry Xiao, LSBU, 2003 Advantages: Easy to install and reconfigure Easy to add or remove devices Simple fault isolation Each device has a fair chance to send the data Ring Topology Disadvantages: A break in the ring can disable the entire network

Figure 2-10 WCB/McGraw-Hill  The McGraw-Hill Companies, Inc., 1998 Hybrid Topology