Overview: Using topologies to discuss networks simply helps us better visualize them. Network topologies help frame the conversation. A topology is the study of spatial relationships between parts. So when used in the context of a network topologies, it normally means the nodes and the links between them. Study Notes: Physical topology deals with cabling […]
Overview: The collapsed core architecture and the three-tier architecture are design approaches, not physical separations. It’s a way of thinking about the network, not a way of viewing actual network devices. Study Notes: Collapsed core Core and Distribution layers are combined as a single layer The collapsed core devices must be capable of core […]
Overview: The exam guide wants you to understand the traffic path to internal and external cloud resources, services, virtual services and basic virtual network infrastructure Study notes: Two physical servers will use twice the amount of electricity as one physical server, but with virtualization, one physical server can host multiple virtual machines. That means all […]
Overview: The exam topics specifically mention firewalls, access points and wireless LAN controllers Study Notes: Firewalls – designed to prevent unauthorized access to your network Adaptive Security Appliances – ASA – A security device that combines firewall, antivirus, intrusion prevention, and virtual private network (VPN) capabilities. It provides proactive threat defense that stops attacks before […]
Overview: TCP is a full-duplex, connection-oriented, reliable and accurate protocol. It’s not a simple task to do all of those things and the cost is additional overhead. If a TCP packet is not received, the hosts will communicate this and the sending host can send the packet again. Before transmitting, a sending host establishes a […]
Overview: Both the OSI model and the TCP/IP model are general-purpose conceptual models that assist in discussing how computers communicate with each other. In the 1960’s, the U.S. Department of Defense awarded contracts to develop packet switching networks. One of those contracts led to the development of the ARPANET by DARPA (Defense Advanced Research Project […]
