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Cisco 642-642 Exam Syllabus Topics:
| Section | Weight | Objectives |
|---|---|---|
| Traffic Policing and Shaping | 15% | - Shaping: GTS, FRTS, CB-Shaping - Policers: single-rate, two-rate |
| Classification and Marking | 20% | - Layer 2 and Layer 3 classification - NBAR, ACL-based classification - Marking mechanisms and trust boundaries |
| Modular QoS CLI (MQC) and AutoQoS | 15% | - Class-maps, Policy-maps, Service-policy - AutoQoS for Enterprise and VoIP |
| Congestion Management | 20% | - Priority queuing and bandwidth allocation - Queuing algorithms: WFQ, CBWFQ, LLQ |
| Congestion Avoidance & Link Efficiency | 10% | - Fragmentation, Compression, LFI - WRED, RED |
| IP QoS Fundamentals and Models | 20% | - QoS models: Best-Effort, IntServ, DiffServ - DSCP, IP Precedence, CoS, MPLS EXP marking - Need for QoS in converged networks |
Cisco Quality of Service (QoS) Sample Questions:
What are two benefits of WFQ? (Choose two.)
- A. Based on DSCP, WFQ allows weighted, random dropping of packets when the WFQ system is full.
- B. WFQ can provide fixed-bandwidth and fixed-delay guarantees.
- C. WFQ can provide fixed-delay guarantees.
- D. WFQ is very easy to configure, and no manual traffic classification is necessary.
- E. WFQ can provide fixed-bandwidth guarantees.
- F. WFQ prevents the large-volume flows with large packet size from starving out the low-volume flows with small packet size.
Correct Answer: D,F 🗳️
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Switch port fa0/2 has been configured to connect an IP phone with an attached PC. Given the set of commands shown below, where does the trust boundary lie?
interface fa0/2 mls qos trust cos mls qos trust device cisco-phone switchport voice vlan 112
- A. between the PC port and the LAN port on the IP phone
- B. between the IP phone and the PC
- C. between the IP phone and the switch
- D. between the access layer switch and the distribution layer switch
Correct Answer: C 🗳️
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Which command is needed to correct the following configurations in order to enable ppp multilink
LFI on the s0/0 interface?
interface Serial0/0
ip address 10.1.1.1 255.255.255.0
encapsulation ppp
no fair-queue
ppp multilink
multilink-group 2001100114
!
interface Multilink2001100114
bandwidth 384
ip address 10.1.1.1 255.255.255.0
service-policy output AutoQoS-Policy-UnTrust
ppp multilink
ppp multilink fragment-delay 10
ppp multilink interleave
- A. the multilink-group 2001100114 command on the Multilink2001100114 interface
- B. the no ip address command on the s0/0 interface
- C. the ppp multilink load-threshold command on the Multilink2001100114 interface
- D. the ppp multilink load-threshold command on the s0/0 interface
- E. the ppp multilink interleave command on the s0/0 interface
Correct Answer: B 🗳️
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For which service is assured forwarding PHB used?
- A. class selector
- B. expedited forwarding
- C. best effort
- D. guaranteed bandwidth
Correct Answer: D 🗳️
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What is the purpose of the qos pre-classify command?
- A. to enable the IOS to classify the packet based on the original IP header instead of the tunnel IP header
- B. to enable the IOS to copy the ToS field from the original IP header to the outer tunnel IP header
- C. to enable class-based marking on IPSec crypto maps
- D. to enable class-based marking on tunnel interface
- E. to enable the IOS to classify the packet based on the outer tunnel IP header instead of the original IP header
- F. to enable the IOS to copy the ToS field from the outer tunnel IP header back into the original IP header
Correct Answer: A 🗳️
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