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ccna 200 301 bookstore hours.is responsible for determining the best path for transmitting data. That is, if devices located on different networks need to transmit data between themSend 5 I=Z4>A connection lost!data, the network layer must transmit traffic for those devices. Routers (Layer 3 devices) are specifically designed for the network layerSend 6 L-...__ II_= Acknowledgement 5designed to provide routing services between interconnected networks.Here's what happens: first, when a packet is received at one of the router's interfaces, it first checks the packet's destination IP address. If the packet is not destined for this router, the router looks up the destination network address in the routing table. When the router selects an outgoing interface, it sends the packet to that interface, encapsulates it into a frame, and sends it to the local network. If the router cannot find the network corresponding to the destination of this packet in the routing tablerouting entry, the router drops the packet. There are two types of packets used by the network layer: data and routing updates. DataPacket: Used to transmit user data over the interconnected network. The protocol used to support dataThe protocols used to support data traffic are called routedprotocols, for example, IP and IPv6 are both routed protocols. More about IP addressing and IPv6 is described in Chapter 5.RouteUpdatePacket: Used to update information about neighboring routers, i.e., to update information about the networks to which all routers in an interconnected network are connected. The protocols used to send route update packets are called routingprotocols, such as RIP, RIPv2, EIGRP, and OSPF are common routing protocols. Routing update packets are used to help build and maintain the routing table on each router.