<Jeremy's IT Lab> Day6: Ethernet LAN Switching (Part2)

Ethernet LAN Switching (Part2)

 

ARP (Address Resolution Protocol):

-> Discover Layer 2 address (MAC) of a known Layer 3 address (IP)

-> consist of:

- ARP Request: broadcast (sent to all host)

- ARP Reply: unicast (sent to one host)

-> cmd: arp -a

-> cml: show arp

• Internet Address = IP Address
• Physical Address = MAC
• Type static = default entry
• Type dynamic = learned via ARP

 

 

 

* Broadcast MAC address : FFFF.FFFF.FFFF

 

Ping:

-> test reachability

-> measures round-trip time

-> consists of ICMP Echo Request / ICMP Echo Reply (both unicast)

-> cmd: ping (ip-address)

 

 

MAC Address Table:

//CLI

SW1# show mac address-table

-> Shows all MAC Address Table entries consists of Vlan, MAC, Type, Ports

SW1#  clear mac address-table dynamic address [mac-address]

-> Removes all MAC Address Table entries which [mac-address]

SW1#  clear mac address-table dynamic interface [interface-id]

-> Removes all MAC Address Table entries which [interface-id]

 

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Acronyms

• ARP : Address Resolution Protocol
• ICMP : Internet Control Message Protocol