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Download CCIE Routing and Switching v4.0 Quick Reference, 2nd by Brad Ellis, Jacob Uecker, Steven Means PDF

By Brad Ellis, Jacob Uecker, Steven Means

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Additional info for CCIE Routing and Switching v4.0 Quick Reference, 2nd Edition.

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N Sometimes used in partial mesh. Modes from Cisco: n Point-to-multipoint nonbroadcast. n Used if interface does not support multicast capabilities. n Neighbors must be manually configured. n DR/BDR election is not required. n Broadcast n Makes WAN appear as LAN. n One IP subnet required. n Hellos discover neighbors. n DR/BDR elected. n Requires full mesh. n Point-to-point. n One IP subnet required. © 2011 Cisco Systems Inc. All rights reserved. This publication is protected by copyright. Please see page 245 for more details.

Before VLSM, to properly address a series of point-to-point networks, a /30 subnet would be required. Without variable length subnets, an entire network would need to be subnetted into /30 networks. If only a handful of /30s were required, many IPs would be wasted. VLSM enables a network administrator to choose subnetting boundaries based on the requirements of the network, rather than being forced to design around the constraints of IP addressing. VLSM does not change other rules of IP addressing.

It does not, however, encrypt any tunneled data. GRE tunnels can be used with OSPF to extend the backbone to a disconnected area. Care must be taken to ensure that the route to the destination address provided during the GRE configuration is not learned via OSPF. This can lead to a recursive route, causing the GRE tunnel to bounce. To create a GRE tunnel, it is necessary to create the numbered tunnel interface: © 2011 Cisco Systems Inc. All rights reserved. This publication is protected by copyright.

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