What is "WAN Services"?

[Subbota]

I know - the question sounds dumb, but I've written the exam 4 times and failed each time (twice of them with 835) getting on "WAN Services" 17%
e.g.
Bridging&Switching 83%
OSI Model&Layered Communications 83%
Routed Protocols 92%
Routing Proticols 89%
WAN Services 17%
Network Management 50%
LAN Technologies 83%
Cisco&Networking Basics 100%
I prepared through cisco.netacad.net, and Ok, I know what OSI is, what Routed/Routing Protocols are, even the Network Management i can comprehend, but what kills me: I do not understand what topics should I hit to fix this 17%. Anyone?

 

[jtb]

from Cisco's webpage:

http://www.cisco.com/warp/public/10/wwtraining/certprog/testing/current_exams/640-607.html

WAN Protocols
[ul][li]Explain key Frame Relay terms and features[/li][li]Configure Frame Relay LMIs, maps, and subinterfaces [/li]
[li]Identify ISDN protocols, function groups, reference points, and channels [/li][li]Differentiate between the following WAN services: LAPB, Frame Relay, ISDN/LAPD, HDLC, PPP, and DDR[/li][li]Identify PPP operations to encapsulate WAN data on Cisco routers[/li][li]Use show commands to display network operational parameters so that anomalies are detected[/li][li]Configure ISDN BRI and legacy dial-on-demand routing (DDR)[/li][li]Configure a serial connection with PPP encapsulation [/li][/ul]



JTB
Solutions Architect
MCSE-NT4, MCP+I, MCP-W2K, CCNA, CCDA,
CTE, MCIWD, i-Net+, Network+
(MCSA, MCSE-W2K, MCIWA, SCSA, SCNA in progress)

 

[axba]

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Axel