CCNA ICND1&ICND2
September 23, 2013
What is a firewall?
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Introduction to OSPF Part 2
Physical Layer
The physical layer is the first layer of the Open System Interconnection Model (OSI Model). The physical layer deals with bit-level transmi...
Session layer
The main function of the OSI model's session layer is to control "sessions", which are logical connections between network d...
Star Topology
In a star topology, each network device has a home run of cabling back to a network hub, giving each device a separate connection to the ne...
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