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Figure 68-2: Structure of the DS field in IVv4 and IPv6 header The 6-bit Differentiated Service Code Point (DSCP) subfield determines the so-called per-hop behavior (see section 684) that the packet will receive within the network The 2-bit CU subfield of the DS field is currently unused Restrictions are placed on the use of half of the DSCP values in order to preserve backward compatability with the IPv4 ToS field use; see [RFC 2474] for details For our purposes here, we need only note that a packet's mark, its "code point" in the DS terminology, is carried in the 8-bit DS field As noted above, a packet is marked (more specificially, its DS field value is set) at the edge of the network This can either happen at a DS-capable host or at the first point at which the packet encounters a DS-capable router For our discussion here, we will assume marking occurs at an edge router that is directly connected to a sender, as shown in Figure 69-1

Disk drives. Do you have sufficient disk space at the DR site to hold everything that you need right away Is the storage accessible by the systems that will need it Is the storage appropriately mirrored If your primary site survived, or if you have an additional DR site, you may want to make sure you can replicate your data to still another site. Tape drives and tapes. One of the lessons learned in the aftermath of September 11, 2001, in New York was that a lot of organizations did not have enough tape drives at their DR sites to restore their data

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Figure 69-3: Simple packet classification and marking Figure 69-3 provides a logical view of the classification and marking function within the edge router Packets arriving to the edge router are first "classified" The classifier selects packets based the values of one or more packet header fields (eg, source address, destination address, source port, destination port, protocol ID) and steers the packet to the appropriate marking function The DS field value is then set accordingly at the marker Once packets are marked, they are then forwarded along their route to the destination At each subsequent DS-capable router, these marked packets then receive the service associated with the packets' marks Even this simple marking scheme can be used to support different classes of service within the Internet For example, all packets coming from a certain set of source IP addresses (eg, those IP addresses that have paid for an expensive priority service within their ISP) could be marked on entry to the ISP, and then receive a specific forwarding service (eg, a higher priority forwarding) at all subsequent DS-capable routers A question not addressed by the diffserv working group is how the classifier obtains the "rules" for such classification This could be done

For applet developers, the Security Manager is a behind-the-scenes player that need not be directly invoked. (In any case, no self-respecting hostile applet would deliberately invoke a security check on itself!) The Java API provides all calls necessary to interface to the operating system, thus making isolation of all required security checks possible within the API. When a dangerous call is made to the Java library, the library queries the Security Manager. These queries use a set of methods that check access. For example, the Security Manager in most browsers contains the methods checkWrite() and checkConnect(), which check whether to allow file writing and the creation of network connections, respectively. If the check passes muster, the call quietly returns; otherwise, a security exception is thrown.

and systems quickly. Since it takes longer to restore than to backup, you may need more tape drives in your DR site than in your primary site. You ll also want to start taking backups, after you ve settled in at the DR site. Do you have enough tapes on site for that effort

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SANs. Do you have a SAN infrastructure at your primary site Is it replicated at the DR site Can all systems access the data and files that they need at the DR site

The Java library's use of the Security Manager works as follows:

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