An Introduction to Authentication
Authentication is the process through which a device or a user's identity is verified before access to various types of resources can be provided. It generally includes a mechanism by which a user or device provides a password to the authenticating device. Then the device checks the password's veracity against a database of passwords. If the password is indeed correct, the user is allowed to proceed and use the resources available based on authorization parameters, if any, t..
Instead of dynamically learning the 0/0 default, a router can set its own default statically. Figure 12-2 demonstrates how to accomplish this. Figure 12-2. Dealing with the 0/0 Default RTC uses the following command: ip route prefix mask {address | interface} [distance] The 0/0 static route can point to a network number, to a gateway address, or to a physical interface as being the default path. The distance is a means of giving preference to the static route in case ..
This section discusses how to configure IPX addresses on LAN and WAN interfaces for Cisco routers. We also discuss the configuration of the four IPX LAN interface encap-sulations used in an IPX environment. LAN Interface Configuration All Cisco routers that are routing IPX have a unique IPX network.node address on each of the attached LAN segments. This address enables the router to know which networks are connected to each interface and where packets for those networks sho..
Split Horizon and Enhanced IGRP
Recall that a split horizon occurs when a router will not advertise a route on the same interface from which it learned the route. In Figure 8-16, router D1 will advertise network 10.1.4.0 to D2 on serial 2/1, but D1 will not send it back to D4 on serial 2/0 because D1 learned this route from D4 on serial 2/0. Figure 8-16. Split Horizon Normal 0 7.8 磅 0 2 false false false EN-US ZH-CN X-NONE ..
Before moving on to discuss how to influence route choices by changing the OSPF interface costs, first take a moment to consider the CPU-intensive SPF work done by a router. SPF does the work to piece together topology information to find all possible routes to a destination. As a result, SPF must execute when the intra-area topology changes, because changes in topology impact the choice of best route. However, changes to Type 3 LSAs do not drive a recalculation of the ..
