Suppose the network layer provides the following service. the network layer in the source host accepts a segment of maximum size 1,200 bytes and a destination host address from the transport layer. the network layer then guarantees to deliver the segment to the transport layer at the destination host. suppose many network application processes can be running at the destination host.
a. design the simplest possible transport-layer protocol that will get application data to the desired process at the destination host. assume the operating system in the destination host has assigned a 4-byte port number to each running application process.
b. modify this protocol so that it provides a "return address" to the destination process.
c. in your protocols, does the transport layer "have to do anything" in the core of the computer network?

Local area networks use many of the same network technologies and the internet, only on a smaller scale. devices that access lans are equipped with a network interface that contains circuitry for wireless or wired connections. devices also have a physical address, in addition to the ip addresses acquired from a dhcp server. the most popular wired technology is . the most popular wireless technology is , which can be configured as a(n) or star topology. setting up a lan and configuring its router is fairly easy. the first step is to change the standard to one that is secure. next, create a(n) that uniquely identifies the network by name. it is also important to activate wireless to prevent wireless signals from being intercepted during transmission. a limited-access network can be created for visitors to use. by activating , the router will be able to assign ip addresses to each device that joins the network. to connect to a secure lan that is protected by encryption, an encryption , or password, is required. lans can be used to access data collected by iot devices and the networks that tie these devices together. technologies such as rfid, nfc, bluetooth smart, zigbee, and z-wave offer -power links, essential for battery-powered devices that can’t expend excess amounts of energy transmitting data.