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What devices transfer packet across multiply network and use tables to store address to determine to best destination?
Routers
When you send a packet to a host in a remote network the packet is forwarded to where?
When you send a packet to a host in a remote network, the packet is first forwarded to the default gateway of your local network. From there, the gateway routes the packet through various intermediary routers across the internet, using the destination IP address to determine the best path. Ultimately, the packet arrives at the target host's network, where it is directed to the specific device intended to receive it.
Which layer of the osi model always provides the address of a packet's final destination?
Network - Always identifies the final destination of a packet
What is used to reassemble the packets in the correct order at the destination device in a packet-switched data network?
In a packet-switched data network, what is used to reassemble the packets in the correct order at the destination device?
What are true statements about routes and their use?
--> If the destination network is directly connected, the router forwards the packet to the destination host. --> If no route exists for the destination network and a default route is present, the packet is forwarded to the next-hop router. --> If the originating host has a default gateway configured, the packet for a remote network can be forwarded using that route.
What contact does IPv4 make with the destination before sending a packet?
Before sending a packet, IPv4 establishes contact with the destination by using the Address Resolution Protocol (ARP) to map the destination IP address to a MAC (Media Access Control) address on the local network. If the destination is on a different network, IPv4 sends the packet to the default gateway, which is determined by the subnet mask. The packet includes the destination IP address, and the network layer handles routing it through the appropriate paths until it reaches the destination.
2 How do routers use the routing table to determine the best path to a destination network?
They check the number of hops a packet passes to reach the the destination. The router then uses the route with least number of Hops.
What does a router do when receives a packet from a unknown network?
When a router receives a packet from an unknown network, it first checks its routing table to determine if there is a known route for the destination address. If no route is found, the router typically drops the packet and may send an ICMP "Destination Unreachable" message back to the sender. Alternatively, if configured, the router could forward the packet to a default gateway or a specified next-hop address. This behavior ensures that the router efficiently manages traffic and maintains network security.
When forwarding a packet which route will the packet select?
First, routing is the process a router performs when making forwarding decisions for each packet arriving at the gateway interface. To forward a packet to a destination network, the router requires a route to that network. If a route to a destination network does not exist on the router, the packet will be forwarded to the default gateway. Now, the destination network can be a number of routers or hops away from the default gateway. If the router has an entry for the network in its routing table, it would only indicate the next-hop router to which the packet is to be forwarded to and not the exact route to the final router. To sum it up, the routing process uses a routing table to map the destination address to the next hop and then forwards the packet to the next-hop address.
Why is it that an ICMP packet does not have source and destination port?
Because ICMP is on the network layer
How is data passed in packets?
The details vary enormously from protocol to protocol, but the basics are the same for all of them. A stream of data is split into packets, the packet has a header which contains (amongst other things) the destination for the packet. The network uses the destination address to deliver the network to the correct destination.
How subnet mask is used by a router?
A subnet mask is used by a router to determine which part of an IP address identifies the network and which part identifies the host. When a router receives a packet, it applies the subnet mask to the destination IP address to ascertain if the destination is within the same local network or if it needs to route the packet to a different network. This helps in efficient routing and ensures that data packets are sent to the correct destination. Additionally, it allows routers to manage and segment network traffic effectively.
