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Exam Name: CCIE Routing and Switching Written Exam v5.0
Cisco 400-101 exam prep,Training material, get exam dumps, free demo
NO.1 What is the cause of ignores and overruns on an
interface, when the overall traffic rate of the
interface is low?
A. a
software bug
B. a bad cable
C. microbursts of traffic
D. a hardware
failure of the interface
Answer: C
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Explanation:
Micro-bursting is a phenomenon where rapid bursts of
data packets are sent in quick succession,
leading to periods of full
line-rate transmission that can overflow packet buffers of the network
stack,
both in network endpoints and routers and switches inside the network.
Symptoms of micro bursts
will manifest in the form of ignores and/ or
overruns (also shown as accumulated in "input error"
counter within show
interface output). This is indicative of receive ring and corresponding
packet
buffer being overwhelmed due to data bursts coming in over extremely
short period of time
(microseconds). You will never see a sustained data
traffic within show interface's "input rate"
counter as they are averaging
bits per second (bps) over 5 minutes by default (way too long to
account for
microbursts). You can understand microbursts from a scenario where a 3-lane
highway
merging into a single lane at rush hour - the capacity burst cannot
exceed the total available
bandwidth (i.e. single lane), but it can saturate
it for a period of time.
Reference:
http://ccieordie.com/?tag=micro-burst
NO.2 Refer to the exhibit.
Which
two statements about the EEM applet configuration are true? (Choose two.)
A.
The running configuration is displayed only if the letter Y is entered at the
CLI.
B. The EEM applet requires a case-insensitive response.
C. The EEM
applet runs after the CLI command is executed.
D. The EEM applet runs before
the CLI command is executed.
Answer: A,D
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Explanation:
sync Indicates whether the
policy should be executed synchronously before the CLI command
executes.
-
If the yes keyword is specified, the policy will run synchronously with the CLI
command.
- If the no keyword is specified, the policy will run asynchronously
with the CLI command.
nocase
(Optional) Specifies case insensitive
comparison.
Here we see that the sync knob was enabled so A is
correct.
However, C is not correct as the nocase argument was not used, so
the applet is configured to display
the config only if a capital Y is
issued.
Reference:
http://www.cisco.com/c/en/us/td/docs/ios-xml/ios/eem/command/eem-cr-book/eem-
cr-a2.html
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