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ccna 200 301 bookstores hiring.Look again at Figure 2.1 - hubs do not separate network segments, they only connect them. So roughly speaking, the economical way to connect two PCs together is to use a hub, which is good for home environments and easy to troubleshoot, but that's where it ends!Nowadays, networks use routers to connect two networks and use them to route packets from one network to the other. Thanks to high-quality router products, smart choices, and excellent service, Cisco has become the de facto standard for routers. By default, routers isolate the BroadcastDomain-all devices in a network segment can receive all broadcasts in that segment. The routers in the small network shown in Figure 2.2 create an interconnected network and segregate the broadcast domains.The network shown in Figure 2.2 is fairly simple. Each host is connected in its own conflicting domain, and the router creates two broadcast domains. Don't forget that the router also provides a WAN service connection! The router uses the Serial Interface to provide WAN connectivity, that is, it uses the V.35 physical interface on the router to make the connection.Chapter 2 Network InterconnectionFigure 2.2 The behavior of routers in creating interconnected network-separated broadcast domains is important because when a host or server sends a network broadcast, all devices in the network must receive and process the broadcast-unless a router is deployed in the network. When a router's interface receives a broadcast, it can simply respond "thanks, but I don't need it" and discard the broadcast rather than forwarding it to the rest of the network. While it is assumed that routers separate broadcast domains by default, it is also important to remember that routers also separate conflicting domains. The benefits of using routers in a network are as follows. They do not forward broadcasts by default.They can filter network traffic based on Layer 3 (network layer, such as IP addresses) information. Routers can provide the following 4 functions to the network: . Packet switching * Packet filtering . Interconnection Network Communications Following Path Selection Unlike Layer 2 switches that are responsible for forwarding or filtering data frames, routers (or Layer 3 switches)uses logical addressing techniques to provide packet switching. Routers can also provide packet filtering through access lists, and when a router connects two or more networks . Together, it uses logical addressing techniques (IP orIPv6),and such networks are called interconnected networks. Finally, routers can also use routing tables (maps of interconnected networks) to perform path selection and forward packets to the remote network.In contrast, switches are not deployed to create interconnected networks (they do not segregate broadcast domains by default); they are deployed in networks to add network LAN functionality. The primary function of a switch is to optimize the work of the LAN - to optimize the performance of the LAN - to provide more bandwidth to LAN users. Switches do not forward packets from one network to another, as routers do. They simply "swap" data frames from one interface to another in a switched network. You may now be thinking, "Wait a minute, what do data frames and packets mean?" I'll cover this in detail in Chapter 3, "Ethernet Technology," I promise!By default, a switch divides/instigates a CollisionDomain. o This is an Ethernet term that describes a network environment in which when a device sends a packet into a segment, all other devices in that segment must receive and view the packet. If another device tries to send the packet at the same time, it causes a conflict to occur and both devices must resend the packet because only one device can send the packet at a time in a conflict domain. That's so inefficient! This typically occurs in environments using hubs, where each host is connected to the hub, constituting a conflict and a broadcast domain. In contrast, each interface on the switch constitutes a separate conflict domain.