Normally, routers do not forward broadcast. There are a few times when an exception to this rule would be useful. IP assignment, for instance, would be easier if you did not have to deploy a DHCP server on every segment. If routers passed broadcasts then a central server could take care of remote locations. Cisco IOS allows routers to forward broadcasts through the ip helper-address command. When configured, a router will forward broadcasts to select UDP ports to pred..
The growing demand for IP addresses has put a severe strain on the classful model. Most companies requesting Class B addresses have estimated that a Class B address would best accommodate their requirements because of the balance between the number of networks and the number of hosts. A Class A was overkill, with more than 16 million hosts, and a Class C had too few hosts per network. By 1991, it was becoming obvious that the Class B consumption was not slowing and actions ..
Better Protection of Enable and Username Passwords
The password required by the enable command can be defined by either the enable password pw command or the enable secret pw command. If both are configured, the enable exec command only accepts the password defined in the enable secret command. The password in the enable password command follows the same encryption rules as login passwords, only being encrypted if the service password-encryption command is configured. However, the enable secret password is not affected by ser..
WAN Aggregator/Branch Router Handoff Considerations
A final consideration in campus Qos design is the campus-to-WAN (or VPN) handoff. In the case of a branch, this equates to a handoff from the branch switch to the branch router. In either case, a major speed mismatch is impending because Gigabit Ethernet/Fast Ethernet campus networks are connecting to WAN links that might be only a few megabits (if that). Granted, the WAN aggregation routers and branch routers have advanced QoS mechanisms to prioritize traffic on their link..
This section addresses the characteristics of real-time interactive traffic and standard data traffic on the network and discusses the QoS requirements of each major type of traffic. This section also introduces the RSVP feature and describes how it allows end systems to request QoS guarantees from the network. Standard Data Traffic Versus Real-Time Traffic The emergence of voice traffic into traditional data networks has made it very common to see both voice an..
