Routing is a path to finding from one end to the other and routing occurs at layer 3 and bridging occurs at layer 2. Routing Process to forward packets to destination networks.
Routers don’t really care about hosts they care only about networks and the best path to each network. The logical network address of the destination host is used to get packets to a network through a routed network, and then the hardware address of the host is used to deliver the packet from a router to the correct destination host.
Routing table is used to find best path to destination. Forwarding decisions based on Layer 3. IP performs search for a matching host address, search for a matching network address, and search for a default entry, Routing done by IP router, when it searches the routing table and decides which interface to end a packet out.
When a router receives a packet, it examines the destination IP address. If the destination IP address does not belong to any of the router’s directly connected networks, the router must forward this packet to another router.
IP routing—the process of forwarding IP packets—delivers packets across entire TCP/IP networks, from the device that originally builds the IP packet to the device that is supposed to receive the packet. In other words, IP routing delivers IP packets from the sending host to the destination host.
Routers don’t really care about hosts they care only about networks and the best path to each network. The logical network address of the destination host is used to get packets to a network through a routed network, and then the hardware address of the host is used to deliver the packet from a router to the correct destination host.
Routing table is used to find best path to destination. Forwarding decisions based on Layer 3. IP performs search for a matching host address, search for a matching network address, and search for a default entry, Routing done by IP router, when it searches the routing table and decides which interface to end a packet out.
When a router receives a packet, it examines the destination IP address. If the destination IP address does not belong to any of the router’s directly connected networks, the router must forward this packet to another router.
IP Routing process:
Step 1:
•Computer A will analyze (AND)the data packet against its subnet masks
–The data is to be sent to another subnet
•Broadcast for the hardware address (eg: CC) of the gateway (IP address is already known)
–Using ARP
•On receiving the hardware address, send the data packet to the gateway (router) to be forwarded to its destination subnet
Step 2:
•The router will now be able to deliver the data packet to its destination in the other subnet
•An analysis of the data packet (AND) will determine the destination subnet
•The gateway will broadcast for the hardware address of the receiving host (IP already known)
•On receiving a response, the packet will be forwarded to the destination host
No comments:
Post a Comment