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CCNP SWITCH Practice Exam:

Quality Of Service (QoS)

To prepare you for success on the CCNP SWITCH exam, here's a practice exam on Quality Of Service.

Answers can be found at the bottom of the page.

For plenty of additional CCNP SWITCH exam tutorials, videos, and practice exams, visit my CCNP SWITCH Tutorials page and my YouTube Cisco Certification Video Training page!

Chris Bryant

CCIE #12999

"The Computer Certification Bulldog"

chris@thebryantadvantage.com

The Only CCNP SWITCH Exam DVD From "The Computer Certification Bulldog" -- Chris Bryant, CCIE #12933.

Question 1:

RED and WRED are most effective under what conditions?

A. traffic is UDP-based

B. traffic is TCP-based

C. traffic is IPX-based

D. traffic is Appletalk-based

Question 2:

Identify the true statements regarding "jitter".

A. Primarily an issue with voice and video traffic

B. Caused by delays in the queue

C. Primarily an issue with data streams

D. Some jitter issues can be resolved through proper application of QoS

E. While there are some solutions to jitter, QoS really isn't one of them

Question 3:

Identify the true statements regarding WRED.

A. Congestion is proactively detected

B. Congestion is not addressed until the queue is actually full

C. Can use IP Prec and CoS to identify traffic to be dropped

D. Incapable of using CoS or IP Prec

E. Commonly called "tail drop"

F. Commonly referred to as "front drop"

Question 4:

Identify the true statements regarding Tail Drop.

A. Is used by WRED

B. Is used by RED

C. Packets dropped as they attempt to enter the queue

D. Packets dropped as they leave the queue

Question 5:

What term describes the "fast/slow/fast" transmission issue that can arise through the use of Tail Drop?

Question 6:

Video and Voice traffic are usually assigned what Class Selector value?

A. 111

B. 110

C. 101

D. 100

Question 7:

Used with Integrated Services, what protocol creates a path for priority traffic in advance of that traffic actually using the path?

Answers right after this brief, important message!

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Answers:

1. "B". RED and WRED both take advantage of TCP's retransmission behavior, and are both more effective when the traffic in question is TCP-based.

2. "A, C". Jitter is definitely an issue with voice and video, and can be addressed through the proper application of Quality of Service.

3. "A, C". WRED detects and addresses congestion before the queue is filled, and can use both CoS and IP Precedence to decide what traffic to drop.

4. "B, C". RED uses Tail Drop, and packets are dropped off the "tail" of the queue - as the packets attempt to enter the queue.

5. When the data senders slow their transmission rate as a result of dropped segments, then accelerate that rate as packet drop slows, and then slow down again when segments are again dropped, that's Global Synchronization.

6. "C". Voice and video are usually assigned a Class Selector value of 5 (101 in binary). The two higher values, 110 and 111, are reserved for network operation traffic.

7. RSVP creates a path for priority traffic, and the path is created and reserved in advance of its actual use.

For plenty of additional CCNP SWITCH practice exams, tutorials, and videos, just click that link for our CCNP SWITCH Exam Resource Center!