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When there are multiple sellers or multiple buyers (or both) for a product, a marketplace helps in negotiating the price to be paid for the product There are several different types of marketplaces: In a reverse auction system a buyer states requirements, and sellers bid for supplying the item The supplier quoting the lowest price wins In a closed bidding system, the bids are not made public, whereas in an open bidding system the bids are made public In an auction there are multiple buyers and a single seller For simplicity, assume that there is only one instance of each item being sold Buyers bid for

The McGraw Hill Companies, 2001

This section will introduce the two failover implementations: active/standby and active/ active Active/Standby Failover Up through version 6 of the operating system, only active/ standby failover was supported Both hardware and stateful failover are supported in this configuration With the active/standby failover implementation, the primary security appliance assumes the active role, and the secondary appliance assumes the standby role When an appliance is in an active state, it forwards traffic between interfaces; this is not true of the standby unit An appliance in a standby state only monitors the active unit, waiting for a failover to take place and then cutting over to an active role These two roles are shown in Figure 1-7 Active/Active Failover Starting in version 7 of the operating system, Cisco added a new failover implementation called active/active failover Both hardware and stateful failover are supported in this configuration With active/active failover, both security appliances can be processing traffic, basically taking advantage of the money you spent on both appliances as well as the bandwidth of the Ethernet cables connected to them

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Active/active failover is demonstrated in Figure 1-8 Use of active/active failover requires the use of two contexts, commonly called virtual firewalls (contexts are discussed in the Advanced Features of the Operating System section) On a security appliance, for one context the appliance will perform the active role, and for the other context the standby role On the other security appliance, the roles for the two contexts are reversed Of the appliances that supported failover, only the ASA 5505 doesn t support the active/ active failover implementation, since it doesn t support contexts NOTE The ASA 5505 does not support active/active failover

the items being sold, and the highest bidder for an item gets to buy the item at the bid price When there are multiple copies of an item, things become more complicated: Suppose there are four items, and one bidder may want three copies for $10 each, while another wants two copies for $13 each It is not possible to satisfy both bids If the items will be of no value if they are not sold (for instance, airline seats, which must be sold before the plane leaves), the seller simply picks a set of bids that maximizes the income Otherwise the decision is more complicated In an exchange, such as a stock exchange, there are multiple sellers and multiple buyers Buyers can specify the maximum price they are willing to pay, while sellers specify the minimum price they want There is usually a market maker who matches buy and sell bids, deciding on the price for each trade (for instance, at the price of the sell bid) There are other more complex types of marketplaces Among the database issues in handling marketplaces are these: Bidders need to be authenticated before they are allowed to bid Bids (buy or sell) need to be recorded securely in a database Bids need to be communicated quickly to other people involved in the marketplace (such as all the buyers or all the sellers), who may be numerous Delays in broadcasting bids can lead to nancial losses to some participants The volumes of trades may be extremely large at times of stock market volatility, or toward the end of auctions Thus, very high performance databases with large degrees of parallelism are used for such systems

As I mentioned earlier, Cisco doesn t use the term firewall when referring to the ASAs and PIXs since these products are multifunction security devices This section will introduce some of the advanced features that will be discussed throughout the book