A router receives a packet from the Gigabit 0/0 interface and determines that the packet needs to be forwarded out the Gigabit 0/1 interface. What will the router do next?
- route the packet out the Gigabit 0/1 interface
- create a new Layer 2 Ethernet frame to be sent to the destination
- look into the ARP cache to determine the destination IP address
- look into the routing table to determine if the destination network is in the routing table
Answers Explanation & Hints: Once a router receives a packet and looks inside the header to determine the destination network, the router compares the destination network to the routing table to determine if the packet is to be routed or dropped. If routed, the router attaches a new Layer 2 header based on the technology that is used by the outgoing port that is used. The packet is then routed out the destination port as designated by the routing table. The ARP cache is used to match an IP address with a MAC address.