From: anthony.sequeira@thomson.com
Date: Fri Nov 10 2006 - 13:32:13 ART
Congrats to Shanky [shankyz@gmail.com] for winning the Cisco Press title
last week!
We will randomly draw again this week from the responses sent to
anthony.sequeira@thomson.com. The winner will receive the CCIE Routing
and Switching Flash Cards and Exam Practice Pack from Cisco Press.
NOTE: Last week's question must have been too easy! Congrats to all the
QoS Experts out there!
LAST WEEK'S RESPONSES:
A - 0%
B - 0%
C - 100%
D - 0%
E - 0%
F - 0%
LAST WEEK'S ANSWER:
Answer: c
Topic Domain: 5b
Issues:
What is a BECN? How will the router react when it receives a BECN?
Solutions:
BECN (Backward Explicit Congestion Notification) is a header bit
transmitted by the destination terminal requesting that the source
terminal send data more slowly. FECNs and BECNs are intended to minimize
the possibility that packets will be discarded when more packets arrive
than can be handled. When a router is configured to react to BECNs
received in a traffic shaping configuration, the router reduces the
transmission rate by 25% by default. An additional sixteen timing
intervals with no BECNs received must elapse before the traffic rate
starts to increase. When the traffic rate does increase, it increases at
a rate of (Bc + Be)/16 bits per timing interval.
More Information:
Policing and Shaping Overview
http://www.cisco.com/univercd/cc/td/doc/product/software/ios122/122cgcr/
fqos_c/fqcprt4/qcfpolsh.htm
LAST WEEK'S QUESTION:
5-7-2. You have configured traffic shaping in your Frame Relay WAN
environment. As part of this configuration you have configured your
router to respond to BECN frames received. By what percentage will your
router reduce the rate of transmission if a BECN frame is received?
a. 10%
b. 20%
c. 25%
d. 40%
e. 45%
f. 50%
THIS WEEK'S QUESTION:
4-1-9. You want to ensure that a 10 Gbps link in your OSPF domain is
assigned a metric of 5. Which configuration makes this possible on your
local router after you have set the bandwidth correctly using the
bandwidth command?
a. auto-cost reference-bandwidth 5
b. auto-cost reference-bandwidth 10
c. auto-cost reference-bandwidth 50
d. auto-cost reference-bandwidth 5000
e. auto-cost reference-bandwidth 1000
f. auto-cost reference-bandwidth 50000
Question of the Week Compliments of:
TESTiT
http://www.netmasterclass.com/site/written.php
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