By Clare Gough, Kevin Downes
This e-book is for an examination, ACRC, that's now not provided through Cisco. BSCN took it really is position.
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Additional info for Acrc Exam Certification Guide
The null interface is a good example of when a technology can be used imaginatively to produce a low-resource solution. Null Interface The null interface is a virtual interface. It exists only in the imagination of the router. Traffic may be sent to it, but it disappears because the interface has no physical layer. It is a virtual interface that does not physically exist. Administrators have been extremely creative and have used the interface as an alternative to access lists. Access lists require CPU processing to determine which packets to forward.
In Figure 2-6, Workstation A is not able to connect to Server C, the development server used by the Research and Development department. The result is that the Research and Development department can see the rest of the organization. Indeed, the rest of the world can see the Research and Development department in a routing table. Any attempt to direct traffic to the network will be unsuccessful, however. The first router that sees the traffic will statically route it to the null interface, which metaphorically is a black hole.
Write out the access list, ensuring that the following is considered: 1 The most frequent instance of traffic is placed first in the list, if possible, to reduce CPU processing. Ch02 Page 32 Tuesday, June 1, 1999 9:06 AM 32 Chapter 2: Managing Scalable Network Growth • • • 2 Specific access is stated before group access is defined. 3 Group access is stated before world access is defined. 4 There is an implicit deny any at the end of the list. 5 If there is a deny statement in the access list, there must be a permit statement in it as well; otherwise, the interface will be shut down for all IP traffic in the direction that the access list was applied.
Acrc Exam Certification Guide by Clare Gough, Kevin Downes