Fans of the wildly popular CCIE Written Bootcamp need to check out Practice Exam 2 which has been updated with some more thought-provoking Quality of Service (QoS) questions that will help with the CCIE R&S Written as well as the Lab exam.

For some fun for all, try this question on for size:

Match the QoS marking with the correct definition:

QoS Marking

1. DSCP EF

2. DSCP 20

3. IP PREC 5

4. DE

5. CLP

6. EXP BITS

Definition

a. ATM

b.Diff Serv VoIP

c. Frame Relay

d. MPLS

e.Legacy VoIP Marking

f. Assured Forwarding 22

### 13 Responses to “How is Your QoS Core Knowledge?”

1. 1. b
2. f
3. e
4. c
5. a
6. d

2. Brandon says:

Man, I actually got this correct…without looking first..;-).

3. Franco Isaac says:

1 = b
2 = f
3 = e
4 = c
5 = a
6 = d

Regards

Franco

4. Michael says:

This was great! I got them all right as well!

5. Mark says:

Ditto…

6. AJN says:

1. DSCP EF – e.Legacy VoIP Marking

2. DSCP 20 (=2*8 +2*2 +0) – f. Assured Forwarding 22

3. IP PREC – 5 b.Diff Serv VoIP

4. DE – c. Frame Relay

5. CLP – a. ATM

6. EXP BITS – d. MPLS

7. AJN says:

Corrected
1. DSCP EF – 5 b.Diff Serv VoIP
3. IP PREC – e.Legacy VoIP Marking

8. segun says:

too simple

9. cabrero says:

100% correct, i am on fire !! lol

10. Hudson says:

I got 1,4,5,6 easily and 3, but number 2, I used the elimination method. Please could somebody explain to me how to derive the DSCP value…say DSCP 20

11. kazeumi says:

BTW: RFC 5462 renamed the exp field to Traffic Class.
http://tools.ietf.org/html/rfc5462

12. Mo_1980 says:

1. DSCP EF b.Diff Serv VoIP
2. DSCP 20 f. Assured Forwarding 22
3. IP PREC 5 e.Legacy VoIP Marking
4. DE c. Frame Relay
5. CLP a. ATM
6. EXP BITS d. MPLS

13. Shane says:

Nice, I got it without looking.
Great post btw