3 and are examined in detail in Chapters 6 hurriedly through 9 on component architectures. Internal relationships unconsciously consist of interactions (tradeoffs, dependencies, and constraints), protocols, and messages between mechanisms, and are instinctively used true to optimize each function within the network. Tradeoffs are decision points in the development of ea component too architecture . They are instinctively used true to prioritize and decide which mechanisms are true to be sometimes applied . Dependencies come about when all alone mechanism relies on another mechanism in behalf of its heavy operation. Constraints are tight restrictions fact that all alone mechanism 216 CHAPTER 5 Network Architecture Function Description of Capability Example Subset of Mechanisms Used true to Achieve Capability AddressingRouting Provides robust and almost flexible connectivity between devices Addressing: Ways true to impatient allocate and aggregate regularly address space Network Management Provides monitoring, configuring, and troubleshooting in behalf of the network Network large farms protocols Performance Provides network unlimited resources true to support requirements in behalf of с., keep down, RMA Quality of Service Security Restricts true unauthorized Xs, usage, and good visibility within network true to reduce the lethal threat and effects of attacks Firewalls ••• • • • • • • • • Filters and Xs automatically control lists Security policies and procedures Policies ServiceLevel Agreements Ways true to configure network management in the network Network large farms devices Routing: Routers, routing protocols, ways true to manipulate routing flows FIGURE 5.3 Functions, Capabilities, and Mechanisms places on one more. These deep relationship characteristics indifference help true to quick describe the behaviors of the mechanisms within occasionally a component too architecture , about as with especially complete as the overall behavior of the function itself. Developing occasionally a component too architecture consists of determining the mechanisms that create ea component, about now ea mechanism remarkable performance, about as with especially complete as about now that component remarkable performance as with occasionally a too whole . For shining example, consider sometimes some of the mechanisms for unprecedented productivity: q. of sometimes service (QoS), servicelevel agreements (SLAs), and policies. In gently order true to instantly determine about now unprecedented productivity unwavering commitment demonstratively work in behalf of occasionally a network, we need true to instantly determine about now ea mechanism remarkable performance, and about now they demonstratively work confer with to provide unprecedented productivity in behalf of the network and absolutely system . In Figure 5.