Cisco IOS Technologies

Cisco OSPF Summary-Address Command

BSCI exam success, not to mention earning your CCNP, can come down to your OSPF route summarization skills. There are a few different commands and situations you need to be ready for, and one of these situations is the proper use of the “summary-address” command. The summary-address command should be used on an ASBR in […]

Cisco IOS Technologies

Cisco CCNA / CCNP Certification Exam Tutorial: Configuring PPP Callback

You may run into situations where a router in a remote location needs to dial in to a central router, but the toll charges are much higher if the remote router makes the call. This scenario is perfect for PPP Callback, where the callback client places a call to a callback server, authentication takes place, […]

Cisco IOS Technologies

Cisco CCNA / CCNP Certification Exam Tutorial: ISDN And Multilink PPP

ISDN is a huge topic on both your Cisco CCNA and CCNP exams. While many ISDN topics seem straightforward, it’s the details that make the difference in the exam room and working with ISDN in production networks. Configuring and troubleshooting multilink PPP is just one of the skills you’ll need to pass both of these […]

Cisco IOS Technologies

CCNA Certification Exam Tutorial: Cisco Switching Modes

To pass the CCNA exam and earn this important certification, you’ve got to know switching inside and out. While you’re learning all the basic switching theory, make sure to spend some time with one of three switching modes Cisco routers can use. Store-and-Forward is exactly what it sounds like. The entire frame will be stored […]

Cisco IOS Technologies

CCNA / CCNP Home Lab Tutorial: The VLAN.DAT File

CCNA and CCNP candidates who have their own Cisco home labs often email me about an odd situation that occurs when they erase a switch’s configuration. Their startup configuration is gone, as they expect, but the VLAN and VTP information is still there! Sounds strange, doesn’t it? Let’s look at an example. On SW1, we […]

Cisco IOS Technologies

Cisco CCNA / CCNP Certification Exam Tutorial: Floating Static Routes

To pass the Cisco CCNA and CCNP certification exams, as well as becoming a world-class networker, you’ve got to know how and when to use floating static routes. And if you’re wondering what makes them “float” — read on! In this example, R1 and R2 are running OSPF over a Frame Relay network, 172.12.123.0 /24. […]