Routing 12

ROUTING

EXCELLENT

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GUESTBOOK

12. Configure OSPF for proper operation in a single area

Enable MD5 OSPF authentication
router(config-if)#ip ospf message-digest-key 4 md5 mypass
router(config-if)#router ospf 1
router(config-router)#area 2 authentication message-digest

RoutingE45
RoutingE46
RoutingE47

Legacy Exam Topics

45. Compare the differences between WAN connection types: dedicated, asynchronous dial-in, dial-on-demand, and packet switched services.

Type of WAN connection

Dedicated lines, used when connection needed all the time.
Asynchronous Dial-In modems, used for WAN connection from 1 to 2 hours per day.
Dial-on-Demand Routing (DDR), best used when
- WAN access is charged in some time interval.
- WAN access is infrequent.
- WAN links are based on traffic selection.
Packet-switched Services—Packet Switched Networks (PSN), best used when
- need WAN connection from 5 to 6 hours per day.
- want to use public maintained network.

Exam

46. Determine when to use PPP, HDLC, LAPB, and IETF encapsulation types.

Encapsulation types

Point-to-Point Protocol (PPP)—Industry standard—used when
- Working with all kinds of routers.
High-Level Data Link Control (HDLC)—Cisco proprietary—deployed when
- Communicating between Cisco routers.
Link Access Procedure, Balanced (LAPB), implemented when
- Having a noisy line using HDLC.
- Having private serial line or using X.25.
Internet Engineering Task Force (IETF) is used on Frame Relay to
- Communicate between a Cisco router and another brand router.

X.25	Frame relay	SMDS	ATM
Packet based	Frame based	Packet switching	Cell switching
56k - T1	56k - 45Mbps	DS1-DS3	> 155Mbps
PVC & SVC	PVC & SVC		PVC & SVC
Extensive error checking	Error checking	No error checking	No error checking
Retransmission	No retransmission

Exam

47. List at least four common issues to be considered when evaluating WAN services.

Availability.
Bandwidth.
Cost.
Ease of management.
Application traffic.
Routing protocols

Exam

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