CAR is a QoS mechanism that also lends itself to use in security implementations. CAR's primary function is to control the amount of traffic flowing through an interface based on various configured parameters. CAR can perform two basic functions: Bandwidth management Traffic classification for use by other QoS mechanisms This chapter concentrates on CAR's first function—bandwidth management on a router. CAR uses rate limit definitions to control the traffic flowing thro..
Area Design of Integrated IS-IS Routers
When designing a network, you have to compromise. Typically, the trade-off is between reliability and speed. What is most efficient for the network is determined by the requirements of the network and the resources available. In designing Integrated IS-IS networks and the hierarchical design, you need to consider the data flow in addition to the resources required by the routing protocol. Tuning the update process might be sufficient, although this results in compromis..
Origins and Recent History of the Internet
The Internet started as an experiment in the late 1960s by the Advanced Research Projects Agency (ARPA, now called DARPA) of the U.S. Department of Defense[]. DARPA experimented with the connection of computer networks by giving grants to multiple universities and private companies to get them involved in the research. In December 1969, an experimental network went online with the connection of a four-node network connected via 56 kbps circuits. The new technology proved to ..
The purpose of the default route in any routing protocol is to forward traffic to destinations that are not in the router's routing table. It is not possible for all the routers in a network to have full Internet routes. For this purpose, routers without full routes to all the destinations forward traffic to the default originating router. Level 1 routers never maintain information about any destination that is outside their area, so all level 1 routers merely s..
The previous section described the technical definition of a VLAN. This section describes practical answers. In a legacy network, administrators assign users to networks based on geography. The administrator attaches the user's workstation to the nearest network cable. If the user belongs to the engineering department and sits next to someone from the accounting department, they both belong to the same network because they attach to the same cable. This creates some interesti..
