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You do not loose your startup-config. You break into Rom Mon mode. Change the config-reg, boot into a slick config. COpy your startup-config to your running-config. Change your passwords to something you can remember. then wri mem and change your config-reg again. Your router will reload your startup config. You need to remember to no-shut your interfaces though because they come up in shutdown mode (default)....Bobdu1
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how to identify the number of broadcat domain and collision domain in hub, router, switch and bridge?
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I do not mean to be contradictory, however, ARP is not a layer two protocol. There are two primary reasons for this. First, ARP resides just above the Data Link layer and acts as a helper protocol for IP. ARP provides a means to map a logical IP address to a physical MAC address. ARP resides at layer three but outside of the IP process and therefore does not have an IP header, which means that it is unroutable. When a frame is received the ethertype number 0x806 in the Length/Type field of the LLC sublayer header of the Data Link header designates that the data is destined for ARP and not IP (ethertype 0x800), ICMP, or IGMP. |
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