Cisco CCNA Notes

per vlan SSTP

cisco switches not just run spanning tree. if i have 5 vlan i have 5 spanning tree in a network.. why 5 vlan spanning tree? for load balancing bridge id field will be modified bridge ID=4bit+12bit+48bbit(mac)     [view]

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

mac address

Media access control 48 bit and written in hexadecimal [view]

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

4 stages in STP

what happend to root port and designated ports and ports that have nothing . blocking-all ports are blocked at initial point .it lasts at 20 sec.BPDU are send listening- root beidge and root port election happens .15 sec learning-15 sec. also called [view]

By: sushmi.J | Related Lesson: Layer 2 - Spanning Tree Protocol (Part 3) Root Ports | Modified: June 20, 2016

cable

cables,Hub and repeaters are physical layer  Roolover cable,twisted cable,unshield [view]

By: raviw | Related Lesson: Layer 1 - Physical Layer | Modified: August 22, 2016

MAC

Layer 2 use Frame: Frame design: Dest: MAC, Source MAC, Data, FCS (Frame Check Sequence) or CRC Cyclic Redundancy Check Only one device work at DataLink Layer>> SWITCH Flood : send to all ports about frame while MAC table is empty Broadcast fr [view]

By: tzin007 | Related Lesson: Layer 2 - Mac Addresses | Modified: June 20, 2016

Layer 2 DataLink

Data Link Layer communications between one device and next immediate data link between two device. PDU Protocol data unit (Frame). Source Address and Destination address need to send frame. common: MAC address 48-bit length , Hex format first 24 bit [view]

By: tzin007 | Related Lesson: Layer 2 - Data Link Layer Overview | Modified: June 20, 2016

OSI Layer 1

Physical Layer > means all device can be touch. cable, hub, Similar device> use cross cable different device> straight through cable PC to router > cross Hub send signal to all ports except the port generate the signal. [view]

By: tzin007 | Related Lesson: Layer 1 - Physical Layer | Modified: June 20, 2016

layer 2 data link

the first 6 bits of a mac address are vendor id OUI Field 7th bit is the universal local bit – if off the address is unique [view]

By: cusstom180 | Related Lesson: Layer 2 - Data Link Layer Overview | Modified: June 19, 2016

Mac address and Frames

FCS – Frame check sequence or CRC – CYclic redudancy check [view]

By: prasath75 | Related Lesson: Layer 2 - Mac Addresses | Modified: June 19, 2016

Cabling

Similar device types will use a crossover cable. Unlike devices or 2 different will use straight-through. [view]

By: el-mourabet | Related Lesson: Layer 1 - Physical Layer | Modified: June 19, 2016

« First ‹ Previous 1 2390 2480 2488 2489 2490 2491 2492 2500 Next › Last »

Our Revolution

We believe Cyber Security training should accessible for everyone, everywhere. Everyone deserves the OPPORTUNITY to learn, begin and grow a career in this fascinating field. Therefore, Cybrary is the world's largest community where people, companies and training come together to give everyone the ability to collaborate in an open source way that is revolutionizing the cyber security educational experience.

We recommend always using caution when following any link

Are you sure you want to continue?

Continue
Cancel