You access this command from the Windows command prompt. The arp command allows the user to view and modify the ARP cache in Windows. Step 3: Verify network connectivity by pinging all the devices from PC-B. Step 2: Configure the IP addresses for the devices according to the Addressing Table. Part 1: Build and Configure the Network Step 1: Cable the network according to the topology. If using another Cisco switch model, it may be necessary to use an Ethernet crossover cable. Note: The Fast Ethernet interfaces on Cisco 2960 switches are autosensing and an Ethernet straight-through cable may be used between switches S1 and S2. Ethernet cables as shown in the topology.Console cables to configure the Cisco IOS devices via the console ports.2 PCs (Windows 7, 8, or 10 with terminal emulation program, such as Tera Term and Wireshark installed).2 Switches (Cisco 2960 with Cisco IOS Release 15.0(2) lanbasek9 image or comparable).1 Router (Cisco 1941 with Cisco IOS Release 15.2(4)M3 universal image or comparable).If you are unsure, contact your instructor.Īnswers Note: Refer to the Answers Lab Manual for the procedures to initialize and reload devices.Īnswers Note: Some of the ARP commands in Windows Vista or later operating systems will require administrator privileges. Note: Make sure that the routers and switches have been erased and have no startup configurations. Refer to the Router Interface Summary Table at the end of this lab for the correct interface identifiers. Depending on the model and Cisco IOS version, the commands available and the output produced might vary from what is shown in the labs. Other routers, switches, and Cisco IOS versions can be used. The switches used are Cisco Catalyst 2960s with Cisco IOS Release 15.0(2) (lanbasek9 image). Note: The routers used with CCNA hands-on labs are Cisco 1941 Integrated Services Routers (ISRs) with Cisco IOS Release 15.2(4)M3 (universalk9 image). You will also clear the ARP cache and add static ARP entries. In this lab, you will use the ARP commands in Cisco routers and in Windows to display the ARP table. Finally, an authorized MAC address list may be configured on Cisco devices to restrict network access to only approved devices. Manually configuring static ARP associations is one way to prevent ARP spoofing. An attacker forges the MAC address of a device, and frames are sent to the wrong destination. ARP spoofing, or ARP poisoning, is a technique used by an attacker to inject the wrong MAC address association in a network. Without ARP, there is no efficient method to build the datagram Layer 2 destination address. ARP is a protocol that enables network devices to communicate with the TCP/IP protocol. Conversely, unlimited hold times could cause errors with devices that leave the network or change the Layer 3 address.Ī network administrator should be aware of ARP, but may not interact with the protocol on a regular basis. This adds latency to the communication and could congest the LAN. With no cache, ARP must continually request address translations each time a frame is placed on the network. An ARP cache timer removes ARP entries that have not been used for a certain period of time.ĪRP is an excellent example of performance tradeoff. Every device on the LAN keeps its own ARP cache, or small area in RAM that holds ARP results. The device that contains the destination IP address responds, and the MAC address is recorded in the ARP cache. To dynamically discover the MAC address for the destination device, an ARP request is broadcast on the LAN. When a frame is placed on the network, it must have a destination MAC address. The Address Resolution Protocol (ARP) is used by TCP/IP to map a Layer 3 IP address to a Layer 2 MAC address. Part 4: Use Wireshark to Examine ARP Exchanges Background / Scenario Last Updated on Januby Admin Appendix Lab – Observing ARP with the Windows CLI, IOS CLI, and Wireshark Answers Lab – Observing ARP with the Windows CLI, IOS CLI, and Wireshark ( Answers Version)Īnswers Note: Red font color or Gray highlights indicate text that appears in the instructor copy only.
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