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Routers
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Routers connect and route data between networks using Layer 3 network addresses, usually IP addresses Routers operate at OSI Layer 3 Once data is routed to the destination network, the data goes to a switch where the destination host resides The switch uses the destination host s MAC address, at OSI Layer 2, to send data the rest of the way to the host
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A switch is an extension of the concept of a hub A hub takes a frame that it receives on any given port and repeats it out to every port on the hub A switch has a learning feature, whereby it learns the MAC address for each host plugged into the switch ports Once it knows this information, the switch will repeat a frame only out to the port that contains the correct destination MAC address Everything at the switch level typically is handled with the MAC address, represented by OSI Layer 2 Each of the layers is encapsulated by the next layer, as shown in Figure 5-1 Computer networks are composed of interconnected LANs, which are simply groups of computers, printers, and other equipment connected to the same network Devices may be assigned physically or logically to the same LAN based on location (such as a building or small geographic office) or function (such as device management or financial applications) Hosts on the network have various applications and protocols that rely on broadcasts, which are a way of addressing all hosts that are in the same broadcast domain If all hosts were on the same LAN on a network of thousands, you could saturate your network with broadcast traffic
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5: Auditing Routers, Switches, and Firewalls
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PART II
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Figure 5-1 Data encapsulation
Routers, by definition, separate broadcast traffic domains (broadcast domains), and many switches also have this powerful capability of controlling broadcast domains These switches essentially separate ports (and therefore hosts connected to those ports) into little groups These groups form virtual networks, or virtual LANs (VLANs), which limit broadcast traffic to the VLAN Side effects include additional security features, whereby you can use Access Control Lists (ACLs) and firewalls to control traffic into and out of the VLAN VLANs aren t necessary to control traffic, but if you have set up a VLAN, you can control traffic into and out of that VLAN VLANs can be used on most types of switches to further segment networks connected to the switch Routing between these VLANs can be performed by routers separate from the switch or, in some cases, integrated into the switch Switches that can switch packets between VLANs without the use of an external router are known as Layer 3 switches VLANs are extremely powerful Think of VLANs as the ability to separate a physical switch into multiple logical switches Additionally, VLANs can be shared within the same network among multiple physical switches and routers, allowing two geographically separated devices to exist logically on the same virtual network VLANs allow network administrators to create segregated networks based on levels of trust or types of traffic For example, you can create a separate VLAN for managing sensitive hosts and prevent general access to the management console of network equipment or sensitive appliances Breaking up the network into smaller LANs also generally helps to reduce the number of broadcasts that individual hosts are required to process, and VLANs also allow network administrators to move a host with a logical change in the switch rather than a cable move
Routers
We now need a way to route traffic between networks Routers forward packets between different networks Eventually, the packaged data, or packet, reaches the remote LAN and then finally arrives at the host on the other side Each router between you and the
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