background image
Answers to the Chapter 10 "Do I Know This Already?" Quiz 429
23
What types of LMI are supported by Cisco routers?
Cisco, ANSI, and Q933a LMI types are supported.
24
What is the advantage of a hub and spoke topology over a full mesh topology?
Hub and spoke topologies are less costly than full or partial mesh topologies. However,
they also lack redundancy. Another advantage is ease of management. A large percentage
of the network can be administered (traffic filters, route filters, and so on) from a single
point.
25
What is the result of using a single serial interface to provide access to multiple remote
sites?
In this type of point-to-multipoint deployment, split horizon causes routing information
about remote sites and networks to be blocked from exiting that interface. The end result
is that the remote routers and their networks are invisible to each other.
Answers to the Chapter 10 "Do I Know This Already?"
Quiz
1
Where on a router is queuing implemented?
Queuing should be implemented on low-speed WAN interfaces only.
2
When should queuing be considered a viable implementation?
Queuing should be considered a solution when the router experiences more than
occasional congestion. If the existing traffic flow is having problems getting through the
router on a regular basis, queuing should be considered.
3
Should a queuing strategy be implemented on all WAN interfaces?
No. Queuing should be implemented on low-speed serial interfaces that experience
regular congestive conditions. If there is no congestion, queuing is not needed.
4
When is WFQ enabled by default?
WFQ is enabled by default on all serial interfaces with speeds of 2.048 Mbps and lower.
Some technologies disable WFQ when the encapsulation is set on the interface.
5
What is the configurable parameter of WFQ?
The configurable parameter in WFQ is the congestive discard threshold. This is the
number of records that can exist in the queue at a given time.
6
What type of traffic gets the highest priority with WFQ?
Low-volume, interactive traffic gets priority on a WFQ-enabled link.