Cisco CCNA Notes

show running config

r1(config)#enable password ?   r1(config)#enable password cisco   r1(config)#exit   r1(config)#enable secret bob   r1(config)#   [view]

By: Mahendra Subedi | Related Lesson: Layer 2 - Cisco IOS LAB (Part 2) OS Modes | Modified: June 18, 2016

Mac address/frames

1st 24 bits are your OUI (Unique Identify) Can not be changed – hard coded. If the 7th most bit turned one (found 2nd 4 bit), then the mac address has been locally changed. [view]

By: Marcus.Flynn | Related Lesson: Layer 2 - Data Link Layer Overview | Modified: June 15, 2016


STP port states: Blocking – last for 20 second ater poweron switches, when BPDU sending starts Listening – sending and recieving BPDU – last 15 seconds Learning – 15 secs – no data trafic, switch populating mac address t [view]

By: b3Nk0 | Related Lesson: Layer 2 - Spanning Tree Protocol (Part 3) Root Ports | Modified: June 15, 2016


Root bridge – Bridge ID = priority + MAC – Priority range is 0 – 65535 – By default all switch have 32768 priority, so the switch with lowest mac becomes Root bridge. – in the begining all switches are sending theyr own [view]

By: b3Nk0 | Related Lesson: Layer 2 - Spanning Tree Protocol (Part 2) Frame Behavior and BPU's | Modified: June 15, 2016

VLAN - Config Command

Default VLAN: VLAN to are deafult and cannopt be delated By default all ports of a switch belongs to VLAN 1. VLAN 1001-1005 are general VLAN and VLAN 1006to 1400249 are extended range Config- OLD Way- Switch# VLAN Database Switch(VLAN [view]

By: raj27 | Related Lesson: Layer 2 - Virtual Local Area Connections | Modified: June 15, 2016

Spanning treee protocol (STP) 1

– prevents network from loops – layer 2 loops = broadcast storms – STP is enabled on switches by default and it is not recomended to disable it – when switches turned on, by default they start sending each other STP frames cal [view]

By: b3Nk0 | Related Lesson: Layer 2 - Spanning Tree Protocol (Part 1) | Modified: June 15, 2016

Class notes

Test [view]

By: sfriday | Related Lesson: Layer 1 - Physical Layer | Modified: July 12, 2016


part 1  physical layer = stuff that you can touch, like cable. it only works with things you can touch. Example: cables, hub and repeaters.   1st cable type is x base T cabling (net cabling) which stants for the speed of the cable an X in he X R [view]

By: rosanealves | Related Lesson: Layer 1 - Physical Layer | Modified: June 16, 2016

Switch Working-Collision/Broadcast Domains

Switch itself is data link. Switch are itself a broadcast domain and routers are boadcast breakup device. HUB is too braodcast domain as they flood. Collision domain is an area of the network where colission can occur. Each port on a switch or router [view]

By: raj27 | Related Lesson: Layer 2 - Broadcast Domains | Modified: June 15, 2016


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 making the world communicate with each other.   [view]

By: rosanealves | Related Lesson: Open Systems Interconnect Model (OSI) Introduction | Modified: June 15, 2016

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