ARP basics for the Cisco CCNA

[@bernicehu]

Can't thank you enough for making these extremly helpful videos for networking learners.

[@videoanand]

Excellent explanation with wireshark.

[@krendoshazin]

ARP is a layer 2 function for MAC address resolution within the local network. Routing outside of the network occurs at layer 3 as a router looks at the IP address header and decides the best route to send it. Because routers operate at layer 3 they don't care about the MAC address. The local network has no knowledge of anything beyond the gateway.

[@ZTechSecurity]

thanks for explaining with wireshark :) it is super explained now..

[@gwolt]

brilliant @ 04:40 scratching beard is initiating

[@iamredheart22]

Why is the first ARP Request from router not a broadcast? Why it is to intel laptop mac directly?

[@ajitadiga007]

I think it was the previous entry when he was deleting the arp table. The first packet should start from packet no 3.

[@LuminousLead]

I imagine that the router sent a message to his computer in the time between running arp -d and refreshing the yahoo browser.

[@rahulkoul9995]

Explaining with wireshark is just as important as defining the protocol! Thank you very much! I have a very basic question though and I hope some can answer it :) We know ARP resolves the Ip to MAC addresses and thats how it know the MAC address of a client but how does it know the Ip address in first place! In other words, how does it know it needs to resolve a particular Ip address? How did it get that Ip address?

[@terae77]

Hi. On my understanding, it depends on the situation. But the most of the times, the IP address is provided by a DNS, which translates a URL to IP.

[@sridharlanka2721]

@First Last "The default gateway gets the ARP request, recognizes that it is directed towards itself, and replies to the PC with its own MAC address by sending a DHCP reply." -----> Could you please confirm Is it ARP Reply or DHCP reply ?

[@shaikrafi3588]

hi, could please let me which simulator software should i use for learning.

[@MrHildebrand]

Packet tracer is a great tool.

[@kisali777]

how to configure snmp on fiberhome (fengine s4800) switch

[@ianchong7422]

WTF, great tute!!!! thank you for sharing.

[@rf2632_]

Very very useful!! Thanks!!

[@mulindwajoseph5176]

As ,i think I know all that I need to know now after watching this

[@CamiloSaka]

Muy buena explicación

[@00mrde]

Very useful

[@RajinderSingh-uq6rq]

Ended abruptly

[@feeltheblissinhari]

Thank you..

[@adamwest5465]

Top man!

[@shohamtzubery8456]

this is the result of googling "wireshrek"

[@diodio3740]

noroy noroy! za warduo wa saikyo no stando da!