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ARP

ARP 101

1. ARP ARP is a protocol used on broadcast networks such as Ethernet, Token Ring or FDDI that is used to map L3 Addresses (like IP) to layer 2 Addresses (like Ethernet MAC). When a host needs to send traffic to another host, it knows its Layer 3 address, but …

DHCP Snooping and DAI

1. DHCP Snooping DHCP snooping can prevent unauthorized DHCP servers to reply to DHCP requests. A switch can define interfaces as trusted or untrusted. A trusted interface is where a DHCP server should be connected. On such interfaces, DHCP server messages are allowed. On all other untrusted ports, DHCP server …

How the routing table is built

1. The Routing Process The routing mechanism involves three different processes: the routing protocols that build the routing table, the routing process that looks up the routing table and the forwarding process that inquires the routing process what to do with a packet. Several routing protocols can run on one …