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the actual user data and therefore will not be readable by the router receiving the compressed data stream A clear disadvantage to this type of compression is that, if traffic has to traverse many routers from source to destination, potentially significant increases in latency may occur That can happen because traffic is compressed and decompressed at every router through which the traffic passes This is necessary for the receiving router to read the uncompressed header information and decide where to forward the packet Per-interface compression delivers typical compression rates of 2:1 and is therefore worth serious consideration for internetworks with fewer than 10 routers between any source and destination This type of compression can be implemented for point- to-point protocols such as PPP or the default Cisco HDLC The following example shows implementation for PPP on the Serial 0 interface For this method to work, both serial ports connected on the point-to-point link must be similarly configured for compression Router1(config)#interface serial 0 Router1(config-int)#encapsulation ppp Router1(config-int)#compress stac The per-interface type of compression that requires each router to decompress the received packet before it can be forwarded is not applicable for use on a public network such as frame relay or X25 The devices within the public network probably will not be configured to decompress the packets in order to determine the header information needed to forward packets within the public network For connection to public networks, Cisco supports compression on a per-virtual-circuit basis This type of compression leaves the header information intact and compresses only the user data being sent An example of implementing this type of configuration for an X25 network is shown as follows As with per-interface compression, both serial ports that are connected (this time via a public network), must be similarly configured Router1(config)#interface serial 0 Router1(config-int)#x25 map compressedtcp 193111 1234567879 compress This command implements TCP header compression with the compressedtcp keyword Pervirtual-circuit compression is implemented via the compress keyword at the end of the command Great care should be taken when you are considering implementing compression on a per-virtualcircuit basis Each virtual circuit needs its own dictionary, which quickly uses up most of the available memory in a router My happiest experiences with compression have been with perinterface compression on networks with a maximum hop count of around 6 or 7 from any source to any destination.

Digital signatures are used to verify that a message that was sent is from the appropriate sender and that it has not been tampered with When using digital signatures, the message is not altered, but a signature string is attached to verify its validity Digital signatures usually use a public-key algorithm A public key is used to verify the message, whereas the private key is used to create the signature A trusted application is usually present on a secure computer somewhere on the network that is used to validate the signature provided This computer is known as a certificate authority and stores the public key of every user on the system Certificates are released containing the public key of the user in question When these are dispensed, the certificate authority signs each package with its own private key Several vendors offer commercial products that provide certificate authority services For example, Microsoft Exchange Server can be set up to provide certificates to mail clients by using digital signatures Lotus Domino also employs this strategy to authenticate client workstations to the server Employing this methodology doesn t mean you re protecting your data completely, but you will know if it has been tampered with It important not only to encrypt data traveling across the network, but also to encrypt it when it gets stored as a file the lack of file encryption leads to theft of data, which is what we hear about increasingly On Windows XP/2003/2008, certificates can be used to encrypt files on an NTFS partition through a feature known as the Encrypting File System (EFS) When implementing EFS in Windows 2000, only the user who encrypted the file can decrypt the file and use it, but in the later Windows operating systems you can select additional persons who can decrypt the file With EFS, the recovery agent always has the capability to decrypt a file as well, and by default the Administrator account is the recovery agent The benefit of having the recovery agent is that if the person who encrypted the file is no longer available, the recovery agent can decrypt the file so that the organization can access the data The disadvantage in some Windows versions is if the recovery agent user account is compromised, so is all of the encrypted data To encrypt a file within the Windows operating systems, perform the steps in Exercise 12-5.

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12:

The low-order bit of the high-order byte is set to 1 Each node can have any number of multicast addresses, and any number of nodes can have the same multicast address The purpose of a multicast address is to allow a group of ETHERNET nodes to receive the same transmission simultaneously, in a fashion similar to the AppleTalk broadcast service multicasting A directory service agent uses this mode to chain a request to many other directory service agents multicast IP address A destination IP address that can be adopted by multiple hosts Datagrams sent to a multicast IP address will be delivered to all hosts in the group

To practice encrypting data on the drive with EFS, check out Exercise 12-5 in LabBookpdf on the CD-ROM

The following commands taken from a router configuration file define the basics for enabling a router to be monitored from an SNMP management station access-list 2 permit 193110 000255 snmp-server community hagar RW 2 snmp-server packetsize 4096 snmp-server trap-authentication snmp-server host 193111 public Let's explore these commands one by one, then look at some additional SNMP commands Command snmp-server community hagar RW 2 allows read and write access to hosts presenting the SNMP community string hagar if access list 2 permits it The community string is like a password; a device wanting SNMP read and write access to the router will need to supply the correct community string Access list 2 only permits packets from the 193110 network (It is assumed that your network management station is on this network number) It is a good security measure to restrict SNMP access to hosts on your network management LAN Command snmp-serverpacketsize4096 raises the maximum packet size, which for SNMP communications defaults to 484 bytes very small It is more efficient in terms of network resource utilization to send a smaller number of larger packets than to send many small packets

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