What is an Address Resoultion Protocol and why do we care?

ARP Address Resolution Protocol, a network layer protocol used to convert an IP address into a physical address (called a DLC address), such as an Ethernet address. A host wishing to obtain a physical address broadcasts an ARP request onto the TCP/IP network. The host on the network that has the IP address in the request then replies with its physical hardware address. Discuss multiplexing: To combine multiple signals (analog or digital) for transmission …

…it is faster. Gateways (>L3): A node on a network that serves as an entrance to another network. Firewalls (L3,>L3) A system designed to prevent unauthorized access to or from a private network. Firewalls can be implemented in both hardware and software, or a combination of both. What is wide-area connectivity (WANS) is the cost-effective, secure answer to your remote access, it's exactly what distributed workforce and remote offices needs.