First, the function
1.MAC Address Learning
2. Confirm the forwarding and filtering of frames
3. Prevent loops
Second, the way of frame exchange
1. Passthrough forwarding: The switch detects the destination address immediately after forwarding
Fast forward switching, small delay, no error correction, sending of fault packets, delay in passthrough forwarding is the time taken to receive this bit to send this bit.
2. Storage and Forwarding: complete acceptance to frame and picket error before forwarding
The entire frame needs to be accepted before forwarding, then the switch reads the destination address and the original address
3. No fragmentation forwarding: The switch detects the first 64 bytes of the frame after forwarding
Filter the conflict domain first, the conflict domain is less than 64 bytes, filter most errors
Advantages and Disadvantages
Pass-through Fast forward error-free check
Storage filters out all errors inefficient, high latency, larger frame forwarding slower
No fragments taken in the middle
Third, the order
Global mode: No IP domain-lookup shutdown domain name resolution
Line console 0 Enter the console
Login Save/passwd XXX
(config-line) synchronization with console #logging synchronous
Exec-timeout never timeout
Global: Enable secret 000 ciphertext
Service passwd-encryption all password encryption
Switchport mode access turns the interface into full-duplex
———— Note: Each device, we should first set up with the console synchronization, never timeout
Turn off domain name resolution to improve our efficiency
Four, VLAN
1.
This article is from the "Kay Sky" blog, please make sure to keep this source http://1349787063.blog.51cto.com/9459104/1708433
ccna--switch