Cisco
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Access Ports
Access Ports Access ports are connected to only a single VLAN, and do not transmit the 802.1Q tags on any ports recieved or transmitted from the switch. This makes the VLAN tag invisible to any host devices that sit on the other end of the network cable. By default Cisco catalyst switches place all ports…
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Virtual LANs
A router between sections of the LAN can help keep broadcast domains to a suitable size, providing efficient network communication. Virtual LANs help keep broadcast domains small by providing seperation between hosts on the same network switch. This can allow a network switch to be better utilised by providing different subnetworks across the same network…
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Collison Domains
The Ethernet protocol began with technologies known as Thinnet (10Base-2) and Thicknet (10Base-5), connecting all devices together using the same coaxial cable and jointed together using T-Connectors. By © Raimond Spekking / CC BY-SA 4.0 (via Wikimedia Commons), CC BY-SA 4.0, Link By © Raimond Spekking / CC BY-SA 4.0 (via Wikimedia Commons), CC BY-SA…
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Layer 2 Forwarding
The data link link layer of the OSI midel handles the physical addressing underneath the network layer for communication between two hosts. Network packets include Layer 2 addressing with their unique source and destination addresses known as media access control or MAC addresses for ethernet. A MAC address is a 48-bit address split across six…
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Network Device Communication
The primary function of the network is to provide connectivity between devices. In the past there was a huge variety of different network protocols but today almost everything is based on Traffic Control Protocol/Internet Protocol (TCP/IP). TCP/IP is based upon the Open Systems Interconnection (OSI) model that is made up of seven layers. Each layer…
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Cisco Live 2019 – Ceritifying with the New Cisco Exams
Cisco Live has been and gone for another year, the biggest highlight being a huge shake up to the Cisco Certification Journey. Lets go through the first three levelsd of certification, CCENT, CCNA and finally CCNP. Cisco Certified Entry Network Technician (CCENT) will be no more as Cisco have condensed the Cisco Certified Network Assocate…
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TSHOOT Topology
The new TSHOOT exam requires you to isolate issues on a defined network topology. The purpose of the exam is to evaluate troubleshooting skills, not how quickly you can grasp a network topology you have never seen. To this end, it is Cisco’s intent that the exam network topology be available for review before the…
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Questions on the OSI Model
Starting from the lowest layer to the highest, in order, name the layers of the OSI Model? Application Data Link Presentation Network Transport Physical Session Transport Control Protocol Internet Protocol [spoiler title=’Answer’ style=’default’ collapse_link=’true’]1. Physical 2. Datalink 3. Network 4. Transport 5. Session 6. Presentation 7. Application[/spoiler]
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The Open System Interconnection (OSI) Model
The Open System Interconnection model is a conceuptual model that standardises the communication functions of a network system. The OSI model divides the communication functions into seven different sections, which ranges from the physical method of connection and transmission at the lowest part of the model (e.g. a CAT5 network cable) to the application that…