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Something you have Something you are (something unique about you) The most common authentication mechanism is to provide something that only you, the valid user, should know The most frequently used example of this is the common user ID (or username) and password In theory, since you are not supposed to share your password with anybody else, only you should know your password, and thus by providing it you are proving to the system that you are who you claim to be In theory, this should be a fairly decent method to provide authentication Unfortunately, for a variety of reasons, such as the fact that people have a tendency to choose very poor and easily guessed passwords, this technique is not as reliable as it should be Other authentication mechanisms are consequently always being developed and deployed Another method to provide authentication involves the use of something that only valid users should have in their possession A physical-world example of this would be a simple lock and key Only those individuals with the correct key will be able to open the lock and thus provide admittance to a house, car, office, or whatever the lock was protecting A similar method can be used to authenticate users for a computer system or network (though the key may be electronic and may reside on a smart card or similar device) The problem with this technology is that people will lose their keys (or cards), which means they can t log in to the system and somebody else who finds the key can then access the system, even though that person is not authorized To address this problem, a combination of the something-you-know/something-you-have methods is often used so that the individual with the key can also be required to provide a password or passcode The key is useless unless you know this code An example of this is the ATM card most of us carry The card is associated with a personal identification number (PIN), which only you should know Knowing the PIN without having the card is useless, just as having the card without knowing the PIN will not give you access to your account The third general method to provide authentication involves something that is unique about you We are used to this concept in our physical world, where people s fingerprints or a sample of their DNA can be used to identify them This same concept can be used to provide authentication in the computer world The field of authentication that uses something about you or something that you are is known as biometrics A number of different mechanisms can be used to accomplish this type of authentication, such as a voice or fingerprint, a retinal scan, or hand geometry All of these methods obviously require some additional hardware in order to operate While these three approaches to authentication appear to be easy to understand and in most cases easy to implement, authentication is not to be taken lightly, since it is such an important component of security Potential attackers are constantly searching for ways to get past the system s authentication mechanism, and some fairly ingenious methods have been employed to do so Consequently, security professionals are constantly devising new methods, building on these three basic approaches, to provide authentication mechanisms for computer systems and networks A more in-depth discussion of various authentication schemes is covered in 9.

3600 (config)# queue-list 1 interface ethernet 0/0 2

115% 191% 709% 1216%

Tip Try to keep the number of queue-list matching statements to a minimum Every time a packet needs to pass through CQ, every command in the queue list must be parsed from top to bottom The more commands you enter, the longer this process will take, and the higher your router's processor use and latency will be The protocol variant is a bit more complicated First, if you just want to match the base protocol (IP and IPX are the only common protocols supported), you leave off the queuekeyword [modifier] [value] section of the command For instance, if you just want to match all IP packets and assign them to Queue 2 in list 1, you enter the following:

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However, this queue list really isn't all that useful To get the full power out of this command, you add the queue-keyword [modifier] [value] section on the end of the command The common modifiers you can use for this command are lt, gt, list, tcp, and udp The lt and gt modifiers stand for less than and greater than, and they are used to match packets with byte sizes less than or greater than the value entered For instance, the following statement matches packets of less than 500 bytes and enters them into Queue 2 of list 1:

309 102 53 (213)

You can also enable or disable CDP globally on the router by using the cdp run and no cdp run global configuration commands, respectively You can also globally set the holddown timer and update interval for the router with the cdp holdtime [time in seconds] and cdp timer [time in seconds] global configuration commands, although you should rarely, if ever, need to use them Note In most environments, CDP is disabled entirely for security reasons

filtering system may look for any message with the words get rich in the subject line of the incoming message Many popular e-mail clients have the ability to implement rule-based filtering Egress filtering Some organizations perform spam filtering on e-mail leaving their organization as well, and this is called egress filtering The same types of anti-spam techniques can be used to validate and filter outgoing e-mail in an effort to combat spam Hybrid filtering Most commercial anti-spam methods use hybrid filtering, or a combination of several different techniques to fight spam For example, a filtering solution may take each incoming message and match it against known spammers, then against a rule-based filter, then a content filter, and finally against a statistical based filter If the message passes all filtering stages, it will be treated as a legitimate message; otherwise, it is rejected as spam Much spam filtering is done at the network or SMTP server level It s more efficient to scan all incoming and outgoing messages with a centralized solution than it is to deploy individual solutions on user desktops throughout the organization E-mail is essentially a proxied service by default: messages generally come into and go out of an organization s mail server (Users don t typically connect to remote SMTP servers to send and receive messages, but they can) Anti-spam solutions are available in the form of software that is loaded on the SMTP server itself or on a secondary server that processes messages either before they reach the SMTP server or after the messages are processed by the SMTP server Anti-spam solutions are also available in appliance form, where the software and hardware are a single integrated solution Many centralized anti-spam methods allow individual users to customize spam filtering for their specific inbox, specifying their own filter rules and criteria for evaluating inbound e-mail The central issue with spam is that, despite all the effort placed into building effective spam filtering programs, spammers continue to create new methods for flooding inboxes Spam filtering solutions are good but are far from perfect and continue to fight the constant challenge of allowing in legitimate messages while keeping the spam out The lack of central control over Internet traffic also makes anti-spam efforts more difficult Different countries have different laws and regulations governing e-mail, which range from draconian to nonexistent For the foreseeable future, spam will continue to be a burden to administrators and users alike.

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