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31 Days Before Your CCNP and CCIE Enterprise Core Exam
book

31 Days Before Your CCNP and CCIE Enterprise Core Exam

by Patrick Gargano
December 2020
Intermediate to advanced content levelIntermediate to advanced
736 pages
22h 40m
English
Cisco Press
Content preview from 31 Days Before Your CCNP and CCIE Enterprise Core Exam

Day 20

GRE and IPsec

Key Topics

Today we review two overlay network technologies: Generic Routing Encapsulation (GRE) and Internet Protocol Security (IPsec). An overlay network is a virtual network that is built on top of an underlay network. The underlay is a traditional network, which provides connectivity between network devices such as routers and switches. In the case of GRE and IPsec, the overlay is most often represented as tunnels or virtual private networks (VPNs) that are built on top of a public insecure network such as the Internet. These tunnels overcome segmentation and security shortcomings of traditional ...

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Publisher Resources

ISBN: 9780136911739