The fundamental problem with EGP is its inability to detect routing loops. Because there is an upper boundary on the distance EGP uses (255), you might be tempted to say that counting to infinity is at least a rudimentary loop-detection mechanism. It is, but the high limit combined with the typical Poll interval makes counting to infinity useless. Given a default Poll interval of 180 seconds, EGP peers could take almost 13 hours to count to infinity. As a result, EGP must be..
Types of Network Attacks Based on Mode of Attack
A network intrusion is often called a network attack. Network attacks can be broken into two broad categories based on how the attack is launched. A network attack can be characterized by the goal its perpetrator is trying to achieve. These goals are generally either denial of service or unauthorized access to network resources. Denial of Service Attacks In denial of service (DoS) attacks, an attacker disrupts the use of services being offered by a service provider to its u..
Point-to-Point Configuration over NBMA
The point-to-point configuration requires an IP subnet for every link. This is the recommended way to run IS-IS over NBMA and the only way to do it on anything less than a full mesh. The configuration is simpler, because the link is point-to-point and there is no need to configure frame-relay map commands. As shown in Example 10-6, it is only necessary to create subinterfaces, configure those interfaces as point-to-point, start Frame Relay, and define the DLCI..
By definition, network bandwidth is finite, and points of congestion do occur. Both real-time and non-real-time traffic types encounter this congestion. If packets cannot be dropped to resolve congestion, packet flows that cause congestion should not be allowed onto the network. This makes the case for the deployment of CAC toolsthese are, in essence, the congestion-avoidance mechanisms for real-time applications. After it is admitted, a real-time flow such as a voice call mu..
Configuring a Basic MPLS P Router
For the P routers in the core of the MPLS network, the primary requirement is to enable CEF and turn on MPLS on each of the interfaces that will be forwarding MPLS tagged packets. In this example, we have also enabled OSPF as a dynamic routing protocol within the MPLS core: Router-P1#configure terminal Enter configuration commands, one per line. End with CNTL/Z. Router-P1(config)#ip cef Router-P1(config)#mpls ip Router-P1(config)#interface FastEthernet0/0 Router-P..
