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Port numbers can be either Transmission Control Protocol (TCP) ports or User Datagram Protocol (UDP) ports The primary difference is in how the traffic is generated with the two protocols TCP is known as a connection-oriented protocol and provides guaranteed delivery Before data is sent between two computers, a TCP handshake process is completed The sending computer sends out a packet similar to saying Are you there The receiving computer replies to this packet with another packet similar to saying Yes, what s up Then the sending computer sends another packet similar to saying Glad you re available, I m going to send you some data Once the three-way handshake process is completed, data is transferred between the two computers If the three-way handshake process failed, the data wouldn t be transferred but instead an error would be generated UDP does not have any handshake process but instead just sends the data UDP is often referred to as connectionless, since it doesn t create the connection as TCP does UDP is frequently used for data that uses a lot of bandwidth and can afford to lose some packets such as streaming audio or video Games that transmit data across a network or the Internet often send the audio and video using UDP If packets are lost in the audio or video stream, you may see jumpy video or hear blank spots where the data is missing, but the overall majority of the data is received

There are 64,535 TCP ports and 65,535 UDP ports that can be used or assigned Of these the first 1024 ports are identified by the Internet Assigned Numbers Authority (IANA) as well-known ports Some well-known ports are listed Table 7-1

80 25 23

443 20, 21 53

By blocking or allowing specific ports in a firewall, you are able to block or allow specific protocol traffic

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This equation allows calculation of Suniverse from two quantities associated with the reaction of interest, Hrxn and Srxn A simpler quantity G can be de ned by multiplying this equation by T, and rearranging which gives: T Suniverse = Hrxn T Srxn = Gsys The quantity G is called the Gibbs free energy Note that it will have units of J/mol or kJ/mol just like enthalpy Because T is always positive, G and Suniverse have opposite signs Sign of Hsys ( ) ( ) (+) (+) Sign of Ssys Sign of Gsys (+) ( ) (+) ( ) ( ) ( ) at low T, (+) at high T (+) at low T, ( ) at high T (+) Product favored yes at low T at high T no

Firewalls can be used to either block or allow traffic When traffic is blocked, then it simply isn t forwarded on to the destination When traffic is allowed, it continues on to the destination just as if the firewall wasn t there A common type of firewall is a packet-filtering firewall Packet-filtering firewalls can be used to block or allow traffic based on

IP addresses You can prevent or allow traffic from specific IP addresses or IP address ranges Ports Specific TCP or UDP ports can be blocked or allowed For example, if you wanted to allow HTTP traffic but block FTP traffic, you could configure a firewall to allow port 80 but block ports 20 and 21 Protocols Some protocols don t use specific ports For example, the Internet Control Message Protocol (ICMP) is used for diagnostic tools such as Ping, Pathping, and Tracert While ICMP can be very useful, it s sometimes used in denial of service (DoS) attacks Because of this, ICMP protocol traffic is sometimes blocked Programs Some firewalls (such as the firewall included with Windows Vista) can be configured to allow or block traffic based on the program You ll see this in action in Exercise 75

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