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When two computers on different networks are communicating, they are often sending packets across multiple routers, allowing traffic to be susceptible to a variety of security holes at each stop along the way. Even with good inspection on a firewall, an attacker can still perpetrate a man-in-the-middle attack, or an attack where someone spoofs a server (trusted host) while sitting between your server and a user accessing your server. A man-in-the-middle attack is designed to intercept some form of data, such as a password or the data that a user is accessing. To keep prying eyes off your data, it is important to implement encryption techniques on that data between the two points, rendering the data unreadable to the interceptor. If your data is passing from your home to your office, for example, you would implement a VPN. If you are taking customer data over web sites, then you might consider using SSL. We discuss using VPN and SSL further in 11.
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Understanding Switches and Hubs
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Hubs are dummy devices that connect multiple computers, making them act as a single segment on a network. With hubs, only one device can successfully transmit data at a time. With hubs, when two computers submit data at the same time, a collision occurs, and a jam signal is sent to all the ports when collisions are detected. This makes one computer able to cause collisions
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CHAPTER 7 SEC URING NE TWORK TRAFFIC
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and force an entire network to slow down while packets that were jammed are re-sent by all the computers that attempted to communicate during the jam. Hubs will also allow any computer to see the packets sent by other computers on the hub. Do not use hubs unless you have a very explicit reason to do so, because they can act as potential collision centers and cause security breaches. Switches are more advanced than hubs and provide expandability, allowing more switches, ports, and computers to exist on a network. Switches perform collision detection and isolate traffic between the source of a packet and its destination. Because each computer is not automatically able to see all the traffic from other computers, this is a more secure communications environment. Switches are less likely to become flooded with collisions and more likely to offer faster throughput and lower latency than hubs in multiswitched environments. Although switches are more expensive than hubs, they are far less expensive than network downtime often caused by hubs. Hubs do still have limited usefulness in networks. Switches respond to loops, hubs do not. When a cable is plugged into a switch twice, it can cause unwanted network traffic. In areas where many users are plugging in their laptops, a cable can get plugged back into a switch by accident, and some network administrators will use a hub to keep this from occurring. Additionally, protocol analyzers connected to switches do not always receive all the desired packets since the switch separates the ports into different segments. Connecting a protocol analyzer to a hub will allow it to see all the traffic on the network segment. Finally, some cluster environments require each computer to receive all the traffic going to the cluster. In these situations, hubs will most likely be more appropriate than switches. Stacked switches are switches designed from the ground up to accommodate multiple switches in a network. When a switch is stackable, it will have dedicated ports for adding more switches that allow speeds of 10 or more gigabits between the switches, using special stackable cables. These are often converted into fiber connections so that latency is optimized over long distances.
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As networks and features of networks have grown, managed switches have become more popular. Managed switches can control internal network traffic and are used to split a network into logical segments, giving more granular control over network traffic and providing more advanced error detection. Managed switches also offer more advanced logging features to help network administrators isolate problem areas. Some managed switches are also stacked, although not all of them are capable of stacking. A standard feature to look for on a managed switch is VLAN support. VLAN, short for virtual LAN, describes a network of computers that behave as if they are connected to the same wire even though they may actually be physically located on different segments of a LAN. VLANs are configured through software rather than hardware, which makes them extremely flexible. One of the biggest advantages of VLANs is that when a computer is physically moved to another location, it can stay on the same VLAN without any hardware reconfiguration. This also works the other way; one physical LAN can be split into multiple logical networks by the VLAN software running on switches. Nearly all managed switches have a VLAN feature set. Newer and more advanced switches also have the capability to perform rogue access point detection, or detection of unwanted access points and routers on a network. Since Apple joined the ranks of operating system vendors that have introduced Internet Sharing as a built-in feature,
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