ETHERNET

ETHERNET

1. Standard 802.2/802.3

   • Bandwidth of 10Mb/s - 100.000Mb/s

2. Depends on the sublayers

   • MAC(Media Access Control)
     • Binary value of 48 bits expressed as 12 hexadecimal digits
       • Data encapsulation
         • Functions
           • Delimitación de las tramas
           • Direccionamiento
           • Detección de errores
       • Media access control
         • Media recovery
         • Control of the placement and removal of wefts in the media
       • Types of communication
         • Unicast
         • Diffusion
         • Multicast
   • LLC(Logical Link Control)
     • Communication between the upper and lower layers

3. Works on layers

   • Data link
   • Physical

4. LAN Switches

   • Works under layer 2 of the OSI Model
     • MAC address table
   • Frame resend methods of the switches
     • Storage and shipping switching
       • Receive the complete plot and calculate the CRC(Cyclic Redundancy Check)
     • Switching by cutting method
       • Send the plot before receiving it in its entirety

5. Duplex parameters

   • Full duplex
     • Both ends of the connection can send and receive data simultaneously
   • Half duplex
     • Only one end of the connection can send data at a time

6. ARP(Address Resolution Protocol)

   • Functions
     • Resolution of IPv4 addresses to MAC addresses
       • The sending device searches the ARP table for the destination IPv4 address and the corresponding MAC address
     • Maintenance of an allocation table
       • ARP uses the ARP Request and ARP Response to perform its functions
   • For each device, an ARP cache timer removes ARP entries that have not been used for a specified period
   • Problems in ARP
     • ARP broadcasts
       • ARP requests can saturate the local segment
     • ARP impersonation
       • Technique used by an attacker to respond to an ARP request from an IPv4 address that belongs to another device, such as the default gateway
   • ARP table
     • Command show ip arp

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