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technology; switched segments, 100 Megabit per second Ethernet and the looming gigabit Ethernet I side with the majority and believe that this is the right thing, however, token ring by its nature is deterministic, whereas Ethernet is not, which raises issues when we start to consider guaranteeing network performance By design, Ethernet creates all nodes on the network equal in terms of their access to network resources Any device that wants to send data on the network can do so at any time, as long as no other device is transmitting This is a good thing for data-oriented networks Increasingly, however, organizations are looking to leverage the investment made in Ethernet networks to deliver multimedia audio and video applications to the desktop These sophisticated multimedia applications need guaranteed amounts of bandwidth and fixed latency to operate well, presenting some significant challenges to the basic Ethernet protocol Background Considerations To guarantee network performance, for specific traffic streams, you must dedicate some network resources to those streams An Ethernet network does not distinguish between packets carrying a videoconference, access to a mission critical database, game data or Internet information Currently, Ethernet cannot deliver service guarantees for two reasons First, the only restriction on any node seeking to gain full access to Ethernet's 10-Mbps throughput is that no other node can be using the network at that time If a node transmitting noncritical data wants to launch a large file transfer that will funnel resources from critical network traffic, it can Second, Ethernet packets are of varying lengths; it takes anywhere from 512 microseconds to 12 milliseconds to transmit an Ethernet frame onto a network cable As a result, critical data will face uncertain delays Proponents of ATM say these challenges to performance guarantees on Ethernet are so fundamental to the way Ethernet operates that it is not feasible to use Ethernet for multimedia applications that require such guarantees The Ethernet crowd counters this by noting improvements in Ethernet bandwidth and other advances such as the Resource Reservation Protocol (RSVP), the Real-time Transport Protocol (RTP) and IPMulticast In practice, most engineering decisions are a compromise In this case, the pluses for Ethernet are that it has a huge installed base, most network administrators understand its operation, and it is significantly cheaper than competing technologies Grafting performance guarantee capabilities onto Ethernet produces a theoretically sub-optimal solution, but one that is good enough for most users On a theoretical level, ATM has two features that make it a technology more appropriate for delivering performance guarantees First, ATM uses a fixed cell length, which reduces latency in switches and reduces variable delays in the network By having a fixed cell (a cell is equivalent in ATM terms to an Ethernet packet) length, switching of cells can be done by hardware, which is much faster than software, as there is no fragmentation and reassembly of packets to worry about Second, ATM is most commonly a connection-oriented technology that uses a call setup procedure for every conversation, which gives the network an opportunity to guarantee performance levels during call initiation Calling ATM a connection-oriented technology does not mean that it is a reliable delivery mechanism like the LAP-B data-link protocol found in X25 There are no cell-recovery procedures because ATM leaves retransmission to higher-layer protocols ATM performance guarantees are managed by a traffic contract that is negotiated during call setup between the network and the device requesting the connection The device requesting connection will ask for one of four classes of service, and the network either will agree to this service level and permit the connection or the connection will be denied The traffic contract places demands on the call-initiating device; if it tries to send more traffic than originally stated, the excess traffic may be discarded by the network.

the world The telephone system concept was based on the idea of enabling two people in different physical locations to speak with each other The same basic idea is used today for many different applications Global networks have been created by corporations and institutions alike to enable remote communication and information sharing The basic functionality of remote connectivity is available in many different protocols and devices For example, companies use network links such as Frame Relay and Asynchronous Transfer Mode (ATM), which encompass many different technologies More common applications include Remote Access Service (RAS), which allows a remote user to use a protocol such as the Pointto-Point Protocol (PPP) to dial in to the RAS server over the public switched telephone network (PSTN) This chapter will first introduce you to types of connections such as PSTN and ISDN and then talk about RAS services and protocols for dial-up using those connection types The chapter will then focus on VPN-type connections and protocols as an alternative way to connect to a remote network

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Public switched telephone network (Pstn)

Almost everyone in the world has used a telephone at least once Today, you can call anywhere in the world and get a direct connection almost instantly using this technology The PSTN was originally designed as an analog switching system for routing voice calls Because it has existed for several decades and has been used by so many, it has come to be known as plain old telephone service (POTS) Because PSTN is considered the first wide area network, it was the basis for many of the WAN technologies that exist today and has been instrumental in their evolution

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During the initial years of PSTN, digital technologies had not even been considered The telephone network was based purely on analog signals traveling across copper wire to transport a human voice The only repetitions of the signal that might have occurred were through one or two repeater devices The term via net loss (VNL) was coined to calculate the signal degradation that occurred This degradation was measured in decibels (dB) The only metering equipment needed to test connections consisted of test tones, decibel meters, and volume unit (VU) meters VU meters were used to measure complex signals such as the human voice These meters simply measure the loss or gain of a specific circuit

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Prior to the 1960s, PSTN lines could handle nothing more than what they were originally designed for voice communication Since then, many great technology leaps have helped the network progress The beginning of this era was marked by the advent of the Bell T1 transmission system As T1s became more frequently used in the telephone network, bandwidth and quality increased This advent also began the true migration from using human operators to route calls to switching these functions electronically In the 1970s and 1980s, the phone companies began to invest more resources in improving the quality of the PSTN backbone This backbone, also known as the digital access cross-connect system (DACCS), was a combination of all the T1 and T3 lines Although many problems were associated with DACCS at that time, it provided a technology upgrade to help improve services all the way around Soon companies started looking at PSTN lines as an alternative to the dedicated point-topoint links they were using As the industry started to move in the direction of PSTN lines, manufacturers began to market modems for this purpose As modems became more commonplace, the manufacturers began mass-marketing them for everyday users Today, although using a modem to dial in to a remote network is not as common as connecting through a broadband connection, it is still an important option for persons not having broadband technologies available People in rural areas may still need to rely on PSTN and some companies may still rely on using PSTN lines to enable remote users to dial in to private networks as well as to back up data links for computer systems that require remote connectivity

Max number of half-open connections before CBAC begins closing connections Number of half-open connections causing CBAC to stop closing connections Rate of half-open sessions per minute before CBAC begins closing connections Rate of half-open sessions per minute causing CBAC to stop deleting connections Number of existing half-open sessions with the same Destination address before CBAC begins closing sessions

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