[2017 New 100% Pass] Latest Cisco CCDP 300-101 Dumps Exam Video Preparation Material Implementing Cisco IP Routing for Best Result

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Exam Code: 300-101
Exam Name: Implementing Cisco IP Routing
Q&As: 424

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300-101 dumps

QUESTION 33
Which three TCP enhancements can be used with TCP selective acknowledgments? (Choose three.)
A. header compression
B. explicit congestion notification
C. keepalive
D. time stamps
E. TCP path discovery
F. MTU window
300-101 exam Correct Answer: BCD
Explanation
Explanation/Reference:

Explanation:
TCP Selective Acknowledgment
The TCP Selective Acknowledgment feature improves performance if multiple packets are lost from one TCP window of data.
Prior to this feature, because of limited information available from cumulative acknowledgments, a TCP sender could learn about only one lost packet per-round trip time. An aggressive sender could choose to resend packets early, but such re-sent segments might have already been successfully received. The TCP selective acknowledgment mechanism helps improve performance. The receiving TCP host returns selective acknowledgment packets to the sender, informing the sender of data that has been received. In other words, the receiver can acknowledge packets received out of order. The sender can then resend only missing data segments (instead of everything since the first missing packet). Prior to selective acknowledgment, if TCP lost packets 4 and 7 out of an 8-packet window, TCP would receive acknowledgment of only packets 1, 2, and 3. Packets 4 through 8 would need to be re-sent. With selective acknowledgment, TCP receives acknowledgment of packets 1, 2, 3, 5, 6, and 8. Only packets 4 and 7 must be re-sent. TCP selective acknowledgment is used only when multiple packets are dropped within one TCP window. There is no performance impact when the feature is enabled but not used. Use the ip tcp selective-ack command in global configuration mode to enable TCP selective acknowledgment. Refer to RFC 2018 for more details about TCP selective acknowledgment.
TCP Time Stamp
The TCP time-stamp option provides improved TCP round-trip time measurements. Because the time stamps are always sent and echoed in both directions and the time-stamp value in the header is always changing, TCP header compression will not compress the outgoing packet. To allow TCP header compression over a serial link, the TCP time-stamp option is disabled. Use the ip tcp timestamp command to enable the TCP time-stamp option.
TCP Explicit Congestion Notification
The TCP Explicit Congestion Notification (ECN) feature allows an intermediate router to notify end hosts of impending network congestion. It also provides enhanced support for TCP sessions associated with applications, such as Telnet, web browsing, and transfer of audio and video data that are sensitive to delay or packet loss. The benefit of this feature is the reduction of delay and packet loss in data transmissions. Use the ip tcp ecn command in global configuration mode to enable TCP ECN.
TCP Keepalive Timer
The TCP Keepalive Timer feature provides a mechanism to identify dead connections. When a TCP connection on a routing device is idle for too long, the device sends a TCP keepalive packet to the peer with only the Acknowledgment (ACK) flag turned on. If a response packet (a TCP ACK packet) is not received after the device sends a specific number of probes, the connection is considered dead and the
device initiating the probes frees resources used by the TCP connection.

QUESTION 34
A network administrator uses IP SLA to measure UDP performance and notices that packets on one router have a higher one-way delay compared to the opposite direction. Which UDP characteristic does this scenario describe?
A. latency
B. starvation
C. connectionless communication
D. nonsequencing unordered packets
E. jitter
Correct Answer: A
Explanation
Explanation/Reference:
Explanation:
Cisco IOS IP SLAs provides a proactive notification feature with an SNMP trap. Each measurement operation can monitor against a pre-set performance threshold. Cisco IOS IP SLAs generates an SNMP trap to alert management applications if this threshold is crossed. Several SNMP traps are available: round trip time, average jitter, one-way latency, jitter, packet loss, MOS, and connectivity tests.
Here is a partial sample output from the IP SLA statistics that can be seen: router#show ip sla statistics 1 Round Trip Time (RTT) for Index 55 Latest RTT: 1 ms Latest operation start time: *23:43:31.845 UTC Thu Feb 3 2005 Latest operation return code: OK
RTT Values:
Number Of RTT: 10 RTT Min/Avg/Max: 1/1/1 milliseconds Latency one-way time:
Number of Latency one-way Samples: 0
Source to Destination Latency one way Min/Avg/Max: 0/0/0 milliseconds Destination to Source Latency one way Min/Avg/Max: 0/0/0 milliseconds Reference:

QUESTION 35
Under which condition does UDP dominance occur?
A. when TCP traffic is in the same class as UDP
B. when UDP flows are assigned a lower priority queue
C. when WRED is enabled
D. when ACLs are in place to block TCP traffic
300-101 dumps Correct Answer: A
Explanation
Explanation/Reference:
Explanation:
Mixing TCP with UDP
It is a general best practice to not mix TCP-based traffic with UDP-based traffic (especially Streaming-Video) within a single service-provider class because of the behaviors of these protocols during periods of congestion. Specifically, TCP transmitters throttle back flows when drops are detected. Although some UDP applications have application-level windowing, flow control, and retransmission capabilities, most UDP transmitters are completely oblivious to drops and, thus, never lower transmission rates because of dropping. When TCP flows are combined with UDP flows within a single service-provider class and the class experiences congestion, TCP flows continually lower their transmission rates, potentially giving up their bandwidth to UDP flows that are oblivious to drops. This effect is called TCP starvation/UDP dominance. TCP starvation/UDP dominance likely occurs if (TCP-based) Mission-Critical Data is assigned to the same service-provider class as (UDP-based) Streaming Video and the class experiences sustained congestion. Even if WRED is enabled on the service-provider class, the same behavior would be observed because WRED (for the most part) manages congestion only on TCP-based flows.
Reference:

QUESTION NO: 36
During the performance of an audit, which of the following are key considerations?
What sampling plans may be necessary?
Is the audit schedule progressing as planned?

Is there a need for a technical specialist?
Is the level of compliance satisfactory?
A. I,IIandIIIonly
B. IIandIVonly
C. I andIVonly
D. I,II,IIIandIV
Answer: B
QUESTION NO: 37
When asked to make recommendations on how to correct any deficiencies noted in the exit report,
the auditor(s) should
A. Make the best recommendation possible.
B. Confer with the client first.
C. Avoid a recommendation in writing but help the auditee of possible.
D. Offer no specific advice and few suggestions.
300-101 pdf Answer: D
QUESTION NO: 38
The example of a supplier’s quality management effort to meet your existing contractual
requirements is MOST like
A product audit.
A process audit.
A system audit.
A. IIonly
B. IIIonly
C. I andIIonly
D. I,IIandIII
Answer: B
QUESTION NO: 39
The audit team normally advises the auditee immediately upon the discovery of a finding during an
audit. Which of the following items is (are) valid reasons for taking this action?
If corrected immediately, the findings may be eliminated from the audit report.
If corrected immediately, it shows genuine auditee interest in the objectives of the audit.
If corrected immediately, it demonstrates the strength of an ongoing audit program.
A. I only
B. IIIonly
C. IIandIIIonly
D. I,IIandIII
300-101 vce Answer: C
QUESTION NO: 40
A purchase order for subassemblies classified as critical must include a review by
Quality engineering.
The procurement department.
Design engineering.
A. IIIonly
B. I andIIIonly
C. IIandIIIonly
D. I,IIandIII
Answer: D

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