ccna-notes6-day12

Packet

The entire process of sending a packet to a remote destination.

Including ARP, encapsulation, de-encapsulation, etc.

Case: ARP Request Src IP: 192.168.1.1 Dst IP: 192.168.1.254 (all broadcast Dst MAC: fff. ffff. ffff Src MAC: 1111

ARP request = BROADCAST ARP reply = UNICAST

step 2 :

ARP Request (for knowing which mac address) Src IP: 192.168.12.1 Dst IP: 192.168.12.2 Dst MAC: fff. ffff. ffff Src MAC: bbbb

ARP Reply(unicast) Src: 192.168.1.1 Dst: cccc Dst: 192.168.4.1 Src: bbbb

If reversed after setting up, that dosen’t need to to arp again

distination ip adderess is still remain Unchange
- it only modify the source and destination mac address in the ethernet header

pc → ipconfig /all router → en , conf t, show int g0/?