ARP: Address resolution protocol Question: how to determine D Each IP node(host, MAC address of B Router on lan has given B's IP address? ARP module table 口 arP Table:IP/MAC 2222222220 address mappings for 1A-23-F9cD06-9日 some LAN nodes adapter IP address, MAC address, TTL> 222222.222223 nod nodel-222.222.222.221 LAN o TTL (Time To Live): time after which address 5C-66-AB-90-75日 88-日22F54-1A0F mapping will be forgotten (typically 20 min) 49-RD-D2-C7-56-2A nde-222222 5: DataLink Layer 5a-75: DataLink Layer 5a-7 ARP: Address Resolution Protocol  Each IP node (Host, Router) on LAN has ARP module, table  ARP Table: IP/MAC address mappings for some LAN nodes < IP address; MAC address; TTL> < ………………………….. >  TTL (Time To Live): time after which address mapping will be forgotten (typically 20 min) Question: how to determine MAC address of B given B’s IP address?