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Understanding the Shortest Path First Algorithm (SPF)
Shortest Path First The SPF algorithm creates a shortest-path tree for all hosts in an area or in the network backbone, with the router that is performing the calculation at the root of that tree. In order for the SPF algorithm to work correctly, all routers in the area should have the same database information.…
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Switchport Security – Follow Along Lab
Securing Catalyst Switch LAN Access Ports This lab will help you study for your Cisco CCNA and CCNP exams which feature hands-on lab testing. Lab Objective: The objective of this lab exercise is for you to learn and understand how to secure Access ports on Cisco Catalyst switches using Port Security and Identity Based Networking…
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IP Subnetting Quiz
Practice your IP subnetting with this 50-question exam. IP subnetting is allocated around 10% of your final marks for exams such as the Cisco CCNA and CompTIA Network+, so you need to know it well. We teach IP Subnetting from scratch in our Amazon best-selling book - IP Subnetting - Zero to Guru.
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IPSec Explained
IP Security (IPSec) is defined and standardized in RFC 2401. Following is an excerpt from that RFC, which defines the IPSec framework: IPSec provides security services at the IP layer by enabling a system to select required security protocols, determine the algorithm(s) to use for the service(s), and put in place any cryptographic keys required…
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What is Kerberos?
Kerberos is a trusted third-party Authentication Layer 7 (Application Layer) service. If you want to learn more about network security then please review our CompTIA Security+ certification course. Kerberos is a secret-key network authentication protocol developed at the Massachusetts Institute of Technology (MIT) that uses the Data Encryption Standard (DES) cryptographic algorithm for encryption and…
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