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09.6 Default Gateways
9/12/2016 Cisco ELearning for ICND1 v2.0 https://ondemandelearning.cisco.com/ciscosc/icnd1#/sections/9/pages/6 1/2 Default Gateways Section 9: IP Addressing and Subnets Before an end system can send a packet to its destination, it must first determine if the destination address is in the local network. The subnet mask defines the network part of the IP address. The end system compares the network portion of the local network address with the destination network address of the packet to be sent. If the network portion of the local address is the same as the network portion of the destination address (the end system and the destination system are on the same network or subnet), the end system uses the ARP process to map the MAC address of the destination to the IP address of the destination. The end system can deliver the packet directly. However, this option is available only if the two hosts are on the same network or subnet. If the two hosts are on different networks or subnets, the sending host must send the packet to the default gateway, which will forward the packet to its destination. The default gateway of a host is a router interface that is connected to the same network as the host and has an IP address on the same network as the host. To use a default gateway, a host must be configured to recognize the IP address of the default gateway as its default gateway. On a Windows computer, the Internet Protocol (TCP/IP) Properties tools are used to enter the default gateway IP address. While routers serve as default gateways, they can also have default gateways of their own. If a router has its own default gateway, the gateway is referred to as the default route. In the following figure, Host A wants to send a packet to Host B. Host A determines that Host B is not on its local subnet, so it sends the packet to its default gateway, Router A. Router A has a route to the destination network 10.3.3.0 and forwards the packet to Router B through the indicated interface. Because the 10.3.3.0/24 subnet is directly connected to Router B interface e0/2, Router B will then use ARP to determine the MAC address of Host B. 9/12/2016 Cisco ELearning for ICND1 v2.0 https://ondemandelearning.cisco.com/ciscosc/icnd1#/sections/9/pages/6 2/2 Content Unavailable This content is unavailable in this version of the course. Up Next: Benefits of VLSM