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Link layer: The network layer routes a packet through a series of packet switches (ie, routers) between the source and destination To move a packet from one node (host or packet switch) to the next node in the route, the network layer must rely on the services of the link layer In particular, at each node IP passes the datagram to the link layer, which delivers the datagram to the next node along the route At this next node, the link layer passes the IP datagram to the network layer The process is analogous to the postal worker at a mailing center who puts a letter into a plane, which will deliver the letter to the next postal center along the route The services provided at the link layer depend on the specific link-layer protocol that is employed over the link For example, some protocols provide reliable delivery on a link basis, ie, from transmitting node, over one link, to receiving node Note that this reliable delivery service is different from the reliable delivery service of TCP, which provides reliable delivery from one end system to another Examples of link layers include Ethernet and PPP; in some contexts, ATM and frame relay can be considered link layers As datagrams typically need to traverse several links to travel from source to destination, a datagram may be handled by different link-layer protocols at different links along its route For example, a datagram may be handled by Ethernet on one link and then PPP on the next link IP will receive a different service from each of the different linklayer protocols Physical layer: While the job of the link layer is to move entire frames from one network element to an adjacent network element, the job of the physical layer is to move the individual bits within the frame from one node to the next The protocols in this layer are again link dependent, and further depend on the actual transmission medium of the link (e g, twisted-pair copper wire, single mode fiber optics) For example, Ethernet has many physical layer protocols: one for twisted-pair copper wire, another for coaxial cable, another for fiber, etc In each case, a bit is moved across the link in a different way.

Today's system administrator is seriously overworked, and security is a big part of the problem. The days of the isolated Local Area Network (LAN) are behind us. Now, most networks are connected directly to the Internet, which means security is more important than ever. Some early adopters and sites with a lot to lose try to protect themselves with advanced security mechanisms such as firewalls, secure shells, and virtual private networks. Many sites, however, have a long way to go before they are "secure enough" (whatever that means). Mobile code systems, including Java, make administering site security trickier. The problem is that users want Java content, but system administrators don't want to take on unnecessary risks. This is a classic example of the well-known tradeoff in computer security between functionality and security. Computer security boils down to managing risks, which in turn implies that the way to make better-informed decisions is to get a handle on the risks. A third goal of this book is to present an informed discussion of the real risks of mobile code. Burying your head in the sand like an ostrich is not a good solution, because security problems are unlikely to miraculously disappear. However, the risks do not necessarily warrant throwing the Java baby out with the bath water. Such a move may leave your users high and dry. Even if the risks turn out to be too much to bear (a decision that is very much context dependent), system administrators need to be wary of snake-oil "solutions" to the mobile code problem. There are a number of products on the market that purport to improve Java security. The question is, do they work We will delve into these issues as well.

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hotel information, street and subway maps, vendor contact information, driving instructions, contact information for pretty much everybody at NYBOT, and all sorts of other relevant information The BCP was the official source of information about which system administrators were expected to report to Queens and which ones would be required to go home It also included trader booth assignments at the Queens site, along with booth phone numbers It even included a wallet-sized card that members could carry at all times with the most important information on it Since the information was made available on paper and electronically via NYBOT s web site, there was no excuse for anyone to be without it Two of the most important issues introduced in the Y2K BCP were the concepts of shared space and staggered trading schedules The Queens site had just 2 trading pits, rather than the 13 at 4 WTC.

If you examine the Table Of Contents, you will see that we have roughly organized this book using the layers of the Internet protocol stack We take a top-down approach, first covering the application layer and then preceding downwards

In order to continue trading under these cramped and limited conditions, they needed to develop a plan to share the trading floor by staggering trading schedules Instead of trading simultaneously for four or five hours a day, as each commodity did at 4 WTC, at the recovery site they would be forced to limit their trading to just 90 minutes a day All around the trading pits are trading booths: small cubiclelike spaces with telephones, where orders are sent to the brokers and all the paperwork associated with the trading is done At 4 WTC, there were 600 booths In Queens, there were just 100 This meant that users who were accustomed to having four or five booths might be relegated to just one or two And instead of having access to the booths all day, traders would only have them for a 90-minute interval each day.

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