PrepAway Cisco CCNP Route Certification Practice Test Questions Part 6 300-101 Exam

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PrepAway Cisco CCNP Route Certification Practice Test Questions Part 6 300-101 Exam

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
Answer:  A 

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.

References: http://www.cisco.com/c/en/us/td/docs/solutions/Enterprise/WAN_and_MAN/QoS_SRND/QoS-SRND-Book/VPNQoS.html

Cisco CCNP Certification Exam 300-101 Practice Tests

 

About 300-101 Exam

The Cisco 300-101 exam is one of three tests that one must pass in order to progress in the CCNP Routing and Switching or CCDP certifications. This test verifies the candidate’s routing knowledge and skills.

The Cisco 300-101 ROUTE exam questions vary from 45 to 65 in number, depending on each paper, and the students are required to offer solutions to them within 2 hours. It is noteworthy to state that the questions are in a multiple-choice format, available in the English and Japanese languages. More importantly, the pass mark for this certification test is 70%. Each question is specifically created to probe and evaluate the real-life experience of the candidates in networking. The 300-101 exam is designed to evaluate one’s understanding of configuration, implementation and organization a Cisco router linked to another network.

This Cisco exam is intended for IT degree students, network technicians and/or designers, and networking gurus who want to sharpen their skills to remain relevant and competitive in Network troubleshooting, switching, and complex/advanced routing. They should have a good understanding of routing protocol configuration, network design, as well as highly secure routing solutions.

Exam topics:
  • Network principles
  • Layer 2/3 technologies
  • VPN technologies
  • Infrastructure services
  • Infrastructure security

Each prospective candidate is expected to pay $300 for this exam. Meanwhile, those who are not successful in their first sitting are not permitted to sit for the test for a stipulated time. At the expiration of this pre-determined time, the interested students can then pay the exam fee again.

Fortunately, sitting for the Cisco 300-101 exam is not really attached with any stringent conditions except the fact that one must not be less than 18 years of age. As part of the preparation, it is strongly suggested that you obtain practical and relevant skills in networking, Cisco routers and modems. This is based on the fact that practical experience is the key to nail most of the questions in this certification test.