Information Technology Reference
In-Depth Information
8.
What is the recommended queuing technique for the WAN interfaces?
a.
PQ
b.
Policy queuing
c.
LLQ
d.
Custom queuing
Scenario Three Answers
1.
The WAN project is to be completed in two months. The VoIP project is to be com-
pleted in six months and within budget.
2.
Ye s , M P L S t e c h n o l o g y i s t h e p r e fe r r e d WA N t e c h n o l o g y t o s u p p o r t Vo I P p a c k e t s .
MPLS provides QoS prioritization and guarantees.
3.
130 kbps. This is calculated by taking five concurrent calls times 26 kbps per call.
4.
7. 8 M b p s . T h i s i s t h e s u m o f Vo I P t r a f f i c p e r s t o r e m u l t i p l i e d b y 6 0 r e m o t e s t o r e s .
5.
B. Vo I P traffic is marked with DSCP expedited for warding, which corresponds to
the Red queue.
6.
D. FTP traffic does not require prioritization and thus is assigned to the default Ye l l o w
queue.
7.
C. LFI should be used on WAN links that are less than 768 kbps. It is used to reduce
the serialization delay associated with the transmission of large packets on low speed
links.
8.
C. LLQ is the recommended queuing technique when Vo I P packets are present on
WA N links.
Falcon Communications has requested an assessment of its current network infrastruc-
ture. You are given the diagram shown in Figure 16-5. The current infrastructure contains
three 6500 Catalyst switches connected using Layer 2 links. Building access switches,
WA N r o u t e r s , I n t e r n e t f i r e w a l l s , t h e m a i n f r a m e , W i n d o w s , a n d V M w a r e E S X s e r v e r s a l l
connect to the 6500 switches. There are more than 2000 users attached to the campus ac-
cess switches, and some Fast Ethernet hubs are still used on the network.
The IT manager mentions that they experience sporadic network outages several times
during the day, and users are complaining that the network is slow. The CIO states that
they want to consolidate and virtualize the network as much as possible, because the
company expects to double in size in three years. They also want to prepare the network
for Unified Communic at ion s (UC).
