CCNA: Difference between revisions
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I'm using GNS3 to emulate a Cisco environment. Get it from [http://www.gns3.net GNS3 Homepage] | I'm using GNS3 to emulate a Cisco environment. Get it from [http://www.gns3.net GNS3 Homepage] | ||
==Internetworking Devices== | |||
===Switches=== | ===Switches=== | ||
Revision as of 17:02, 26 March 2010
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.
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
