CCNA Routing and Switching Lesson 02 - Network Devices - Eric Vanderburg

1,318 views

Published on

CCNA Routing and Switching Lesson 02 - Network Devices - Eric Vanderburg

Published in: Technology
0 Comments
0 Likes
Statistics
Notes
  • Be the first to comment

  • Be the first to like this

No Downloads
Views
Total views
1,318
On SlideShare
0
From Embeds
0
Number of Embeds
3
Actions
Shares
0
Downloads
258
Comments
0
Likes
0
Embeds 0
No embeds

No notes for slide

CCNA Routing and Switching Lesson 02 - Network Devices - Eric Vanderburg

  1. 1. Network Devices Chapter 2 Networking Essentials – Eric Vanderburg © 2005
  2. 2. Network Devices Repeater  Hub  WAP (Wireless Access Point)  Bridge  Switch  Router  Brouter / Layer 3 Switch  Gateway 
  3. 3. Repeater Attenuation – degeneration of a signal  Cleans up the signal  Extends the distance of the network  Repeaters are for digital transmissions  Optical repeaters for fiber optics  Amplifiers are for analog transmissions  Layer 1 component 
  4. 4. 5-4-3 rule  5 segments, 4 repeaters, 3 of the five segments may contain host nodes.
  5. 5. Hub      Central wired access point Broadcasts all data to all other devices (everything that goes in comes back out) Shared medium (contention) Layer 1 component Passive Hub    Does not regenerate the signal Does not have to be powered Active Hub    Regenerates the signal Must be powered Multi-port repeater
  6. 6. WAPs (Wireless Access Points) Wireless clients connect through specified channels within an electromagnetic frequency  Layer 1 device  Contention  Speeds get slower the further away you are from the AP (Access Point)  Other objects may cause interference 
  7. 7. Ethernet CSMA/CD (Carrier Sense Multiple Access Collision Detection)  Collisions cause nodes to enter into a backoff state where they do not transmit 
  8. 8. Bridge         Analyzes layer 2 addresses Makes forwarding decisions Broadcast frames are always forwarded Segments the collision domain Layer 2 device Transparent Bridge - Keeps a bridging table for each side Source-Routing Bridge – The source host provides info on how to reach the destination host. (Used on Token Ring networks) Translation Bridges – connect two different networks
  9. 9. Switch Multi-port Bridge  Layer 2 device  Creates a bridging table for all ports  Microsegmentation – creating a virtual circuit between two ports.  Each port receives the full bandwidth  Reduces the collision domain  Higher security against sniffers (also harder to do network diagnostics) 
  10. 10. Routers        Connects internetworks and diverse segments Layer 3 device Looks at logical addresses to make a routing decision Exchanges routing information with other routers using routing protocols Segments the broadcast domain because broadcasts are not routed Slower than lower network devices Can filter packets based on ACLs (Access Control Lists)
  11. 11. Other Devices  Brouter / Layer 3 Switch Works with frames for nonroutable protocols and packets for routable protocols  Can route between VLANs (Virtual LANs)  Faster in some cases than a router   Gateway  Can translate between different protocols suites all the way to the application layer
  12. 12. Acronyms ACL, Access Control List  AP, Access Point  CSMA/CD, Carrier Sense Multiple Access Collision Detection  VLAN, Virtual LAN  WAP, Wireless Access Point 

×