CCNA Networking

I'd be pretty willing to bet you've heard the term VPN more than once before. Maybe you even know what one is, but just in case, a virtual private network (VPN) allows the creation of private networks across the Internet, enabling privacy and tunneling of non-TCP/IP protocols.

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Configuring through the SDM is definitely the easiest way to go for wireless configurations, that is, if you're using any type of security. And of course you should be! Basically, all you need to do to bring up an access point is to just turn it on. But if you do have a wireless card in your router.

The Cisco Unified Wireless Network delivers many innovative Cisco enhancements and supports Wi-Fi Protected Access (WPA) and Wi-Fi Protected Access 2 (WPA2), which provide access control per user, per session via mutual authentication and data privacy and through strong dynamic encryption.

WPA or WPA2 Pre-Shared Key (PSK) is a better form of wireless security than any other basic wireless security method mentioned so far. I did say basic.

SSID is a common network name for the devices in a WLAN system that create the wireless LAN. An SSID prevents access by any client device that doesn't have the SSID. The thing is, by default, an access point broadcasts its SSID in its beacon many times a second. And even if SSID broadcasting is turned off, a bad guy can discover the SSID by monitoring the network and just waiting for a client response to the access point.

All Wi-Fi Certified wireless LAN products are shipped in "open-access" mode, with their security features turned off. While open access or no security may be appropriate and acceptable for public hot spots such as coffee shops, college campuses, and maybe airports, it's definitely not an option for an enterprise organization, and likely not even adequate for your private home network.

wireless security is nonexistent on access points and clients. The original 802.11 committee just didn't imagine that wireless hosts would one day outnumber bounded media hosts, but that's truly where we're headed.

Now that our serial connection between the Corp and R3 routers is up and running with PPP and you know how to configure PPPoE, I want to show you how easy it is to set up Frame Relay using SDM.

To configure PPPoE with SDM, we'll first need a router connecting to a DSL modem, and then we'll need to configure the interface as a client just as we did earlier. I'll make it painless by using SDM on my 871W router.

First, I'm going to configure the serial WAN link between the Corp router and the R3 router using PPP with Authentication.

Troubleshooting Frame Relay networks isn't any harder than troubleshooting any other type of network as long as you know what to look for, which is what I'm going to cover now.

The debug frame lmi command will show output on the router consoles by default (as with any debug command).

The show frame map command displays the Network layer-to-DLCI mappings. Here's how that looks