Cisco CCNA Certification Exam Tutorial: Port Based Authentication
To pass your CCNA exam and earn this coveted certification- you must understand the details of port-based authentication. This knowledge has a great
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Cisco CCNA Certification Exam Tutorial: Port Based Authentication
To pass your CCNA exam and earn this coveted certification- you must understand the details of port-based authentication. This knowledge has a great deal of value in production networks as well- since this authentication scheme is regularly implemented. Let/' s take a look at this particular C Contd...
To pass your CCNA exam and earn this coveted certification- you must understand the details of port-based authentication. This knowledge has a great deal of value in production networks as well- since this authentication scheme is regularly implemented. Let/' s take a look at this particular CCNA skill.
Consider a situation where you have a server that will be connected to your switch- and you want the port to shut down if a device with a different MAC address that that of the switch attempts to connect to that port. You could also have a situation where you have someone who has a connection to a switch port in his office- and he wants to make sure that only his laptop can use that port.
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Whether you/' re on the road to the CCNA- CCNP- MCSE- or you/' re on any other computer certification track- the odds are that sooner or later- you/' re going to fail an exam. It/' s happened to almost all of us- yours truly included. What you have to keep in mind in these times is that su...
Both of these examples are real-world situations- and there are two solutions for each. First- we could create a static MAC entry for that particular switch port. I don/' t recommend this- mainly because both you and I have better things to do than manage static MAC entries. The better solution is to configure port-based authentication on the switch.
The Cisco switch uses MAC addresses to enforce port security. With port security- only devices with certain MAC addresses can connect to the port successfully. This is another reason source MACs are looked at before the destination MAC is examined. If the source MAC is non-secure and port-based authentication is in effect- the destination does not matter- as the frame will not be forwarded. In essence- the source MAC address serves as the password.
CCNP Certification BSCI Exam Tutorial: The BGP Neighbor Process
Like TCP- BGP is connection-oriented. An underlying connection between two BGP speakers is established before any routing information is exchanged. This connection takes place on TCP port 179. As with EIGRP and OSPF- keepalive messages are sent out by the BGP speakers in order to keep this rel...
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MAC addresses that are allowed to successfully communicate with the switch port are secure MAC addresses. The default number of secure MAC addresses is 1- but a maximum of 132 secure MACs can be configured.
When a non-secure MAC address attempts to communicate with the switch port- one of three actions will occur- depending on the port security mode. In Protect mode- frames with non-secure MAC addresses are dropped. There is no notification that a violation has occurred. The port will continue to switch frames for the secure MAC address.
In Restrict mode- the same action is taken- but a syslog message is logged via SNMP- which is a messaging protocol used by Cisco routers.
In Shutdown mode- the interface goes into error-disabled state- the port LED will go out- and a syslog message is logged. The port has to be manually reopened. Shutdown mode is the default port-security mode.
Port-based authentication is just one of the many switching skills you/' ll have to demonstrate to earn your CCNA certification. Make sure you know the basics shown here- including the action of each particular mode- and you/' re on your way to CCNA exam success!
Cisco CCNP, BSCI Exam Tutorial: 10 ISIS Details You Must Know!
Earning your CCNP certification and passing the BSCI exam depends on knowing the details of many Cisco technologies- ISIS chief among them. To help you prepare for exam success- here/' s a list of ISIS terminology and basic concepts that will help you pass this tough exam. Enjoy!...
Cisco CCNA Certification Exam Tutorial: Port Based Authentication
To pass your CCNA exam and earn this coveted certification- you must understand the details of port-based authentication. This knowledge has a great deal of value in production networks as well- since this authentication scheme is regularly implemented. Let/' s take a look at this particular C...
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To pass your CCNA exam and earn this coveted certification- you must understand the details of port-based authentication. This knowledge has a great deal of value in production networks as well- since this authentication scheme is regularly implemented. Let/' s take a look at this particular C
