Interface identifiers (IDs) in IPv6 addresses are used to identify a unique interface on a link and are sometimes referred to as the "host portion" of the IPv6 address. Interface IDs must be unique on a link. They are always 64-bits long and can be dynamically created, based on the data-link layer address. The specific data link layer type of the interface determines how the IPv6 interface IDs are dynamically created and how address resolution works. For Etherne..
Verifying IP Connectivity and Troubleshooting
At one point or another, every administrator must troubleshoot a user's complaint of not being able to reach some destination on the network. Lack of connectivity can be the result of network outages caused by WAN service failures, misconfiguration of routers and other devices in the network, access list controls (whether intentional or otherwise), and myriad other possibilities. Although there is no substitute for network test equipment, such as protocol analyzers, the route..
Distribution routers consolidate connections from access routers. They are often arranged in a configuration that is resilient to failure of a single core router. Distribution routers usually contain topological information about their own region, but they forward packets to a backbone router for inter-region routing. NOTE In smaller regions, distribution and backbone routers may be one and the same. In larger regions, distribution routers themselves may form a hierarchy...
Protecting Cisco IOS from Intrusion
Now that you have a snapshot of modern security concerns, look at Cisco IOS and the configuration commands you can use to deny intruders the ability to harm valuable network resources that are typically connected behind a Cisco router. In particular, this section covers how you can stop DoS attacks. There are, of course, various Cisco IOS vulnerabilities that can only be protected against by new software releases and regular Cisco IOS bulletins and e-mail blasts from Cisco S..
Technical Overview of Cisco IOS Frame Relay Compression Schemes
This section introduces the different compression schemes for Frame Relay that are supported by the Cisco IOS software. In general, users select a compression scheme that falls under either the payload compression scheme or packet header compression scheme. Data Payload Compression Schemes The Cisco IOS software supports a packet-by-packet payload compression scheme using Stacker compression. The Cisco packet-by-packet payload compression for Frame Relay feature..
