ccna--switch

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