Cisco CCNA Notes

layer 3

controlls communication between broadcast domain.if u want to go to one broadcast domain to another u need network layer need a router to connect. device works at layer 3 is router funtion is sending data protocol unit is packet for layer 3 address a [view]

By: sushmi.J | Related Lesson: Layer 3 - Network Layer Overview | Modified: June 20, 2016

lab to test trunking protocol

vtp mode? to switch 1   client server transperant vtp mode server vtp domain ccna vtp password cisco do show vtp status to see the password do show vtp password GO TO SWITCH 2 and make it transparent vtp mode transparent vtp domain ccna vtp password [view]

By: sushmi.J | Related Lesson: Layer 2 - VLAN Trunking Protocol LAB | Modified: June 20, 2016

Trunking

VLAN trunking protocol 1.VTP server mode(can modify vlan.dat file such as adding,deleting,naming,changing a vlan MTU) 2.VTP client mode(will lisiten to the modification.it cannot modify anything) 3.VTP transparent mode(it will forward advertisments t [view]

By: sushmi.J | Related Lesson: Layer 2 - VLAN Trunking Protocol | Modified: June 20, 2016

Data Link Layer

controls communication between one device and the next immediate device to it comm on the immediate physical link  PDU=Protocol Data Unit Addressing Scheme source address and destination address MAC (medium access control)= six byte or 48 bits and i [view]

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

Layer 2 – Mac Addresses

The PDU at layer2 is a FRAME Dest. MAC -> Source MAC -> Data->Frame Check Sequence FCS houses the CRC – Cyclic Redundancy check CRC – it performs a calculation on the whole frame and comes up with a number   If Dest and Receiver [view]

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

port fast enabling lab on switches

Commands for STP enhancements: where to use this feature? on switch port go to port f0/24 spanning tree port fast enable port fast on switch 2 at port 24 too and as well as switch 3 and in switch 4 go to router 4 now enable  for switc 4 too     [view]

By: sushmi.J | Related Lesson: Layer 2 - Port Fast LAB | Modified: June 20, 2016

Physical Layer

Cabling, Repeaters, Hubs XBaseT X=10 e.g Base= Baseband Signal= one signal at a time carry signal to 100 m HUB= Multi port repeater  [view]

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

two enhancements made to STP

STP enhancements: enhances features are portfast . as it takes 50 sec to make the port actually work after blocking mode.the portfast it immedialty transfers the port to forwarding without blocking 2.bpdyguard for security purposes. to prevent agains [view]

By: sushmi.J | Related Lesson: Layer 2 - Spanning Tree Enhancements | Modified: June 20, 2016

STP lab

commands show spanning-tree vlan 100(name) for chaning prioroty spanning tree vlan 150 priority ? and slect the valus   [view]

By: sushmi.J | Related Lesson: Layer 2 - Spanning Tree Protocol LAB | Modified: June 20, 2016

Layer 2 DataLink

Layer 2 controls communication on the immediate link between 2 devices The data is put in a set structure (PDU-Protocol data unit) Layer 2 addressing scheme is the MAC address 48 bits in length (Hex) MAC Address First 24 Bits = OUI Field cannot be ch [view]

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

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