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Cisco 642-642 Exam Overview:
| Certification Vendor: | Cisco |
|---|---|
| Exam Name: | Implementing Cisco Quality of Service (QoS) |
| Exam Number: | 642-642 |
| Passing Score: | Approx. 790 / 1000 |
| Certificate Validity Period: | Retired (no longer available) |
| Available Languages: | English |
| Exam Format: | Simulation, Multiple Choice, Multiple Answer, Drag and Drop |
| Exam Duration: | 90 minutes |
| Real Exam Qty: | 45-55 |
| Related Certifications: | Cisco Certified Network Professional (CCNP) |
| Exam Price: | USD 200-300 (varies by region) |
| Sample Questions: | DOWNLOAD DEMO |
| Exam Way: | Computer-based exam (Pearson VUE test center or online proctored, depending on availability) |
| Pre Condition: | Recommended Cisco CCNA-level networking knowledge or equivalent experience |
| Official Syllabus URL: | https://www.cisco.com |
Cisco 642-642 Exam Syllabus Topics:
| Section | Objectives |
|---|---|
| QoS Fundamentals | - QoS models and architectures (Best Effort, IntServ, DiffServ) - Introduction to Quality of Service concepts |
| Congestion Avoidance | - Random Early Detection (RED, WRED) |
| Traffic Policing and Shaping | - Policing mechanisms and configuration concepts - Traffic shaping techniques and use cases |
| Congestion Management | - Queuing mechanisms (FIFO, WFQ, CBWFQ, LLQ) |
| Link Efficiency Mechanisms | - Fragmentation and interleaving (LFI, MLP QoS concepts) |
| Classification and Marking | - Packet marking (DSCP, CoS, IP Precedence) - Traffic classification methods |
| QoS Implementation on Cisco Devices | - Modular QoS CLI (MQC) configuration - End-to-end QoS deployment considerations |
Cisco 642-642 Certification Exam Q&A
Cisco Quality of Service (QoS) is an official Cisco exam, registered under the code 642-642. A passing score earns you the CCIP certification, positioned at the Professional level. The credential also connects to Cisco Certified Network Professional (CCNP), so it can anchor a broader certification path. Because Cisco designs its exams around real job tasks, holding this certification signals practical skill rather than memorized theory.
Candidates face 45-55 questions inside a 90 minutes window on the Cisco Quality of Service (QoS) exam. That ratio leaves little slack, which is why pacing deserves as much practice as the content itself. Learn to budget your minutes, park stubborn questions instead of wrestling them, and rehearse under a real clock: a few timed runs in the ActualCollection test engine will make the official time limit feel routine rather than threatening.
The passing bar for Cisco Quality of Service (QoS) is set at Approx. 790 / 1000, and registering for the exam officially costs USD 200-300 (varies by region). There is no reduced price for a second try: fail, and you pay USD 200-300 (varies by region) in full again. That makes honest self-testing the cheapest insurance available, so hold off on booking until your ActualCollection practice scores sit clearly above the passing line, attempt after attempt.
Recommended Cisco CCNA-level networking knowledge or equivalent experience
Vendor policies are revised from time to time, so double-check the eligibility details before registering on the official exam page.
Absolutely. A free PDF demo of the Cisco Quality of Service (QoS) questions is available at ActualCollection, so you can inspect the quality and formatting before any money changes hands. Once you buy, updates are free for 365 days, and when that period runs out you can extend the update service at 50% off the regular price.
ActualCollection offers a 100% money-back guarantee with specific conditions. If you take the Cisco Quality of Service (QoS) exam within 60 days of purchase and fail, you may claim a full refund, provided the exam matches your product. Sitting the exam within 3 days of purchase disqualifies a claim, as do downloaded-but-unused products, free materials, and expired orders; the candidate name must also match the payer name. To file, submit a scanned enrollment slip and the official Score Report PDF within 2 days of the exam, and the claim is processed within 7 days. If you prefer, you can skip the refund and instead receive two other exam products of equal value at no charge while keeping the update service on your original purchase.
As for delivery: it is immediate. Your files become downloadable the moment payment completes and are also emailed to you within one minute. If nothing shows up within 2 hours, contact customer service. You may install the software on an unlimited number of computers.
Cisco Quality of Service (QoS) is divided into 7 official domains. Among the headline areas are Traffic Policing and Shaping, Congestion Avoidance, and Link Efficiency Mechanisms. Scroll up to the exam topics section for the full breakdown, and use it as a checklist: any line you cannot confidently explain deserves another round of practice.
Cisco Quality of Service (QoS) Sample Questions:
Question 1
When configuring a Cisco Catalyst switch to accommodate an IP phone with an attached PC, it is desired that the trust boundary be set between the IP phone and the switch. Which two commands on the switch are recommended to set the trust boundary as described? (Choose two.)
A. mls qos trust device cisco-phone
B. mls qos cos 5
C. switchport priority extend trust
D. no mls qos trust dscp
E. mls qos trust cos
F. mls qos trust extend [cos value]
Question 2
Refer to the partial router configuration. Which two of the following statements are true? (Choose two.)
A. The configuration is invalid since it refers to a class map within a different class.
B. Only those packets which satisfy all of the matches in class1 and class2 will be subject to policing.
C. Any IP packet will be subject to policing.
D. All traffic from a server with the IP address of 147.23.54.21 will be subject to policing.
E. Regardless of destination IP address, all traffic sent to Mac address 1.2.3 will be subject to policing
F. The class-map class1 command will set the qos-group value to 4 for all IP packets.
Question 3
Which QoS mechanism adds IP Precedence information for prefixes into the FIB table?
A. Class-Based WRED
B. QoS pre-classify
C. QPPB
D. AutoQoS
E. LLQ
F. Class-Based Marking
Question 4
Based on the following show output, which statement is true?
WG1S1#sh mls qos interface fa0/1 FastEthernet0/1 trust state: not trusted trust mode: trust cos COS override: dis default COS: 0 pass-through: none trust device: cisco-phone
A. All incoming CoS markings are trusted.
B. A Cisco IP Phone is not connected to the fa0/1 switch port.
C. All incoming DSCP markings are trusted.
D. DSCP markings from the Cisco IP Phone are trusted.
Question 5
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 access layer switch and the distribution layer switch
C. between the IP phone and the PC
D. between the IP phone and the switch
Solutions:
| Question 1 Answer: A,E | Question 2 Answer: D,E | Question 3 Answer: C | Question 4 Answer: B | Question 5 Answer: D |





