IPsec VPN video tutorial

Cisco three-layer hierarchical model

Because networks can be extremely complicated, with multiple protocols and diverse technologies, Cisco has developed a layered hierarchical model for designing a reliable network infrastructure. This three-layer model helps you design, implement, and maintain a scalable

Access Control Lists (extended)

Access Control List or ACL is a technic of controling network traffic. It is a list of rules with which traffic flow can be manipulated - permitted or denied. By default, traffic flow from the interface with the higher security level (for example "inside" interface) to interface with the lower security level (example "outside" interface) is allowed by default, but the flow of traffic from "outside" to the "inside" interface must be explicitly permited.

Classes of IP addresses

TCP/IP defines five classes of IP addresses: class A, B, C, D, and E. Each class has a range of valid IP addresses. The value of the first octet determines the class. IP addresses

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