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1re partie : Examiner une requête ARP Étape 1 : Générez des requêtes ARP en envoyant une requête ping à 172.16.31.3 à partir de 172.16.31.2. a. Cliquez sur172.16.31.2et ouvrez l'invite de commandes (Command Prompt). b. Exécutez la commande arp -d pour effacer la table ARP. c. Passez en mode Simulation et exécutez la commande ping Packet Tracer - Examine the ARP Table. Part 1: Examine an ARP Request Step 1: Generate ARP requests by pinging 172.16.31.3 from 172.16.31.2. a. Click 172.16.31.2 and open the Command Prompt. b. Enter the arp -d command to clear the ARP table. c. Enter Simulation mode and enter the command ping 172.16.31.3. Two PDUs will be generated. • IP Packet Format 2 3 Aside: Interaction with Link Layer • How does one find the Ethernet address of a IP host? • ARP • Broadcast search for IP address • E.g., "who-has 128.2.184.45 tell 128.2.206.138" sent to Ethernet broadcast (all FF address) • Destination responds (only to requester using unicast) with appropriate 48-bit Ethernet address • E.g, "reply 128.2.184.45 is 3) exécuter à nouveau la commande "arp" dans pc3, et observer la différence. 4) Se mettre dans pc2 et exécuter aussi la commande "arp" Maintenant, on va générer du trafic entra pc2 et pc1 (ce trafic traverse donc les deux routeurs). 1) Dans pc2, exécuter "ping 195.11.14.5" 2) Vérifier l'état de l'arp cache dans pc2 2. Reverse Address Resolution Protocol (RARP) -. Reverse ARP is a networking protocol used by a client machine in a local area network to request its Internet Protocol address (IPv4) from the gateway-router's ARP table. The network administrator creates a table in gateway-router, which is used to map the MAC address to corresponding IP address. CASE-1: The sender is a host and wants to send a packet to another host on the same network. Use ARP to find another host's physical address; CASE-2: The sender is a host and wants to send a packet to another host on another network. The sender looks at its routing table. Find the IP address of the next-hop (router) for this destination. ARP Packet Format Figure 43 shows the format of an ARP request and an ARP reply packet when used on an Ethernet to resolve an IP address ARP. PowerPoint Presentation csucfedu. Any machine with the requested IP address will reply with an ARP packet. ARP reply is sent by PC2 after receiving ARP request Here are the. Sends pending IP packets Request If receiver is target forms response Unicasts