CCNA: Difference between revisions
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==WHAT== | ==WHAT== | ||
I'm trying to study to get my CCNA degree :D I'm using my wiki to note what I'm trying to learn ! Much of the stuff here are from SYBEX CCNA Study guide (6th edition). Hope it'll help other people. | I'm trying to study to get my CCNA (640-802) degree :D I'm using my wiki to note what I'm trying to learn ! Much of the stuff here are from SYBEX CCNA Study guide (6th edition). Hope it'll help other people. | ||
==Software== | ==Software== | ||
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<br/><br/> | <br/><br/> | ||
==Traffic Congestion== | ===Traffic Congestion=== | ||
Can be caused by: | Can be caused by: | ||
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* Multicasting | * Multicasting | ||
===TEST=== | |||
Do you _SEE_ the "collision domains" and "broadcast domains" here : | |||
[[Image: CCNA_Test1.png|400px]] | |||
9 collision domains | |||
- All hub network - 1 collision domain | |||
- The bridge network - 3 collision domains | |||
- The switch network - 5 collision domains | |||
3 broadcast domains | |||
- Only the router breaks up broadcast domains ! It has 3 connections. | |||
Revision as of 18:20, 26 March 2010
WHAT
I'm trying to study to get my CCNA (640-802) degree :D I'm using my wiki to note what I'm trying to learn ! Much of the stuff here are from SYBEX CCNA Study guide (6th edition). Hope it'll help other people.
Software
I'm using GNS3 to emulate a Cisco environment. Get it from GNS3 Homepage
Internetworking Devices
Switches
They work at Layer 2
They break up "collision domains" only.
Routers (Layer 3 switches)
They work at Layer 3
Cisco calls them multiport bridges.
Advantages:
- They break up "broadcast domains" by default ( 1 broadcast domain per interface ).
- They break up "collision domains".
- Can filter network based on Layer 3 ( Network Layer ) information ( e.g., IP Address )
Useful at:
- Packet switching
- Packet filtering
- Internetwork communication
- Path selection
Bridges
They break up collision domains.
Hubs
They keep all hosts in the same collision domain.
They often cause traffic congestion if on a busy network.
Traffic Congestion
Can be caused by:
- Too many hosts in a broadcast domain
- Broadcast storms
- Multicasting
TEST
Do you _SEE_ the "collision domains" and "broadcast domains" here : Error creating thumbnail: File missing 9 collision domains - All hub network - 1 collision domain - The bridge network - 3 collision domains - The switch network - 5 collision domains 3 broadcast domains - Only the router breaks up broadcast domains ! It has 3 connections.
