Cisco CCNA Notes

CCNA: OSI Model, Data Link Layer (Layer 2)

Controls communication on the immediate link between two devices. Immediate connection between the two devices. At layer 2, the data has been put into a set structure.  PDU = Protocol Data Unit Layer 2 PDU = Frame Layer 2 needs an addressing scheme [view]

By: Shana Edmond | Related Lesson: Layer 2 - Data Link Layer Overview | Modified: June 20, 2016

Physical Layer - Layer 1

Layer 1 Physical Layer (These are three uses in Physical Layer) 1.cable 2. repeaters 3. hubs Covering cable types:  X base T cable X stands for the speed of cable (ethernet cabling) 10 :  cable is 10 megabits per second 100 :  cable os 100 megabit [view]

By: rterhune | Related Lesson: Layer 1 - Physical Layer | Modified: June 20, 2016

CCNA: OSI Model, Physical Layer (Layer 1)

Physical Layer ”stuff that you can touch” (Cables, hubs, repeaters) Cable type: X base T, AKA Ethernet (straight through or crossover) *Similar device types use straight through cable* *Two switches use crossover* X = speed of cable base [view]

By: Shana Edmond | Related Lesson: Layer 1 - Physical Layer | Modified: June 20, 2016

Open Systems Internconnect Model (OSI)

Layer 1 – Physical Layer Layer 2 – Data Link Layer Layer 3 – Network Layer Layer 4 – Transport Layer Layer 5 – Session Layer Layer 6 – Presentation Layer Layer 7 – Application Layer  Layers:  PDNTSPA  / Pl [view]

By: Shana Edmond | Related Lesson: Open Systems Interconnect Model (OSI) Introduction | Modified: June 20, 2016

layer 1

cables: 1.Xbase-T X(speed)base(base band signal(single sidnal))-T(twisted pair ) falour: stain through(used for opposise device type) cross over(used for same device type) type: sheided twisted pair un sheided twisted pair(used when there is electr [view]

By: ashn | Related Lesson: Layer 1 - Physical Layer | Modified: June 20, 2016

IOS

Types of memory: ——————- RAM  – hold running config. NVRAM – Holds start-up config file. Non Volatile. Flash  – Holds Operating system.   *****             [view]

By: prasath75 | Related Lesson: Layer 2 - Cisco IOS LAB (Part 1) | Modified: June 20, 2016

Open Systems Interconnect model (OSI)

Open Systems Interconnect model (OSI) (1) Physical Layer:   (2) DataLink Layer (3) Network Layer (4) Transport Layer (5) Session Layer (6) Presentation Layer (7) Application Layer   [view]

By: rterhune | Related Lesson: Open Systems Interconnect Model (OSI) Introduction | Modified: June 20, 2016

CCNA

FCS – frame check sequence  [view]

By: allward89 | Related Lesson: Layer 2 - Mac Addresses | Modified: June 20, 2016

Layer 2 - Mac addresses

Protocol data unit: the way the data structured at layer 2. protocol data unit @ layer 2 called Frame the Frame contain: * Destination MAC. * Source MAC. * DATA. * Frame check sequence, this field houses whats called (cyclic redundancy check) ” [view]

By: zeyad1991 | Related Lesson: Layer 2 - Mac Addresses | Modified: June 20, 2016

Notes for class one

OSI  OPEN SYSTEMS INTERCONNECT MODEL   7 LAyers   Physical Layer Data Link Layer Network Layer Transport Layer Presentation Layer Application Layer [view]

By: dshepard | Related Lesson: Open Systems Interconnect Model (OSI) Introduction | Modified: July 3, 2016

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