Hot Downloads

Welcome, Guest
Username: Password: Remember me

TOPIC: Ethernet II

Ethernet II 13 years 1 month ago #7647

If data + header is less than 64Bytes in Ethernet II we are going for padding,Why?

Why minimum Ethernet II frame is 64Bytes and maximum is 1500Bytes.
The administrator has disabled public write access.

Ethernet II 13 years 1 month ago #7656

  • TheBishop
  • TheBishop's Avatar
  • Offline
  • Moderator
  • Posts: 1719
  • Thank you received: 8
  • Karma: 5
The minimum frame size is indeed 64 bytes (14-byte header plus 46-byte data area plus 4-byte CRC). Historically the reason for a minimum legal frame size was to ensure that the collision detection mechanisms that are at the heart of Ethernet can operate correctly. This is easier to grasp if you think of Ethernet as a shared bus made out of a single long coaxial cable with stations tapped off it at intervals as in the days of old. The same basic mechanisms apply to point-to-point twisted pair, it's just harder to visualise.
Frame length is also one of several criteria used to decide whether a recieved frame is valid or not. Where a short frame is concerned, the length differentiates between a legal frame and a fragment. At the other end of the scale, a frame longer than the maximum allowed is not a valid frame but a jabber
The administrator has disabled public write access.
Time to create page: 0.101 seconds


Cisco Routers

  • SSL WebVPN
  • Securing Routers
  • Policy Based Routing
  • Router on-a-Stick

VPN Security

  • Understand DMVPN
  • GRE/IPSec Configuration
  • Site-to-Site IPSec VPN
  • IPSec Modes

Cisco Help

  • VPN Client Windows 8
  • VPN Client Windows 7
  • CCP Display Problem
  • Cisco Support App.

Windows 2012

  • New Features
  • Licensing
  • Hyper-V / VDI
  • Install Hyper-V


  • File Permissions
  • Webmin
  • Groups - Users
  • Samba Setup