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3. Select the appropriate WAN connection types that address specific site connection considerations

WAN Connection Types

LL (Leased Lines)
PSN (Packet-Switched Networks)
CSN (Circuit-Switched Networks)

WAN Services

Service	Max Spd	Type	Control	Bandwidth	Remarks
LL	T3	LL	High	Dedicated	High cost for enterprise network
FR	T3	PSN	Medium	Shared	For branch office
X.25	2Mbps*	PSN	Low	Shared	Legacy technology
ISDN	PRI-E1 BRI-128kbps	CSN	Low	Shared	PRI for CO BRI for BO
Async	64kbps	CSN	Low	Shared	Low variable cost for SOHO / RO

* http://www.cisco.com/warp/public/133/3.html

Typical WAN Protocols

PPP
SLIP (Serial Line Internet Protocol)
HDLC (High-Lever Data Link Control)
X.25/LAPB
FR (Frame Relay)
ATM (Asynchronous Transfer Mode)

Connection	Protocol	Cable
LL	PPP, HDLC, SLIP	Synchronous serial
PSN	X.25, FR, ATM	Synchronous serial
CSN	PPP, SLIP	Asynchronous serial / ISDN

Cisco Synchronous Serial Standards

EIA/TIA-232
EIA/TIA-449
V.35
X.21
EIA-530

Cable configurations

Asynchronous: RJ-11 from modem to phone jack + EIA/TIA-232 if connecting to the router
ISDN BRI: Straight cables with RJ-45
ISDN PRI-T1:
- External CSU: Female DB-15 to straight-through
- Internal CSU: Standard cross cables with RJ-48
ISDN PRI-E1: DB-15 to BNC / DB-15 / RJ-45 / twin axial
ISDN BRI: RJ-11
FR: DB-60 / Smart Serial to EIA/TIA-232 / EIA/TIA-449 / V.35 / X.21 / EIA-530

Exam 3

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