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Updated: Sep 19, 2026
No. of Questions: 91 Questions & Answers with Testing Engine
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640-821 Practice Q&A's
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Cisco 640-821 Exam Overview:
| Certification Vendor: | Cisco |
|---|---|
| Exam Name: | Introduction to Cisco Networking Technologies |
| Exam Number: | 640-821 |
| Available Languages: | English |
| Exam Format: | Multiple Choice, Simulation |
| Related Certifications: | Cisco CCNA (two-exam option) |
| Sample Questions: | Cisco 640-821 Sample Questions |
| Exam Way: | Onsite at Pearson VUE (historical practice for Cisco exams) |
| Pre Condition: | None formally published; designed as introductory exam before CCNA or as part of CCNA two-exam path. :contentReference[oaicite:0]{index=0} |
Cisco 640-821 Exam Syllabus Topics:
| Section | Objectives |
|---|---|
| Networking Fundamentals | - OSI and TCP/IP models - Network types and components |
| Cisco IOS and Device Operation | - Cisco IOS navigation and commands - Basic device configuration |
| Switching Fundamentals | - VLAN basics - LAN switching concepts |
| Network Media and Topologies | - WAN technologies overview - Ethernet LAN technologies |
| Network Management and Troubleshooting | - Network monitoring basics - Basic troubleshooting techniques |
| IP Addressing and Routing Basics | - IPv4 addressing and subnetting - Basic routing concepts |
Cisco Introduction to Cisco Networking Technologies Sample Questions:
What data structure is described in the graphic?
- A. TCP segment
- B. Ethernet frame
- C. IP datagram
- D. UDP datagram
- E. FDDI frame
- F. Token Ring frame
Correct Answer: A 🗳️
Which two statements describe the IP address 10.16.3.65/23? (Choose two.)
- A. The network is not subnetted.
- B. The lowest host address in the subnet is 10.16.2.1 255.255.254.0.
- C. The broadcast address of the subnet is 10.16.3.255 255.255.254.0.
- D. The last valid host address in the subnet is 10.16.2.254 255.255.254.0
- E. The subnet address is 10.16.3.0 255.255.254.0.
Correct Answer: B,C 🗳️
Which statements accurately describe CDP? (Choose three.)
- A. CDP can discover directly connected neighboring Cisco devices.
- B. CDP is a datalink layer protocol.
- C. CDP is an IEEE standard protocol.
- D. CDP is a network layer protocol.
- E. CDP is a Cisco proprietary protocol.
- F. CDP can discover Cisco devices that are not directly connected.
Correct Answer: A,B,E 🗳️
Which of the following commands enables a network administrator to verify the application layer connectivity between source and destination?
- A. telnet
- B. traceroute
- C. verify
- D. trace
- E. ping
Correct Answer: A 🗳️
A receiving host has failed to receive all of the segments that it should acknowledge. What can the host do to improve the reliability of this communication session?
- A. decrease the sequence number
- B. decrease the window size
- C. use a different source port for the session
- D. start a new session using UDP
- E. obtain a new IP address from the DHCP server
Correct Answer: B 🗳️
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Online Test Engine can supports Windows / Mac / Android / iOS, etc., because it is the software based on WEB browser. You can use it on any electronic device and practice with self-paced.
Online Test Engine supports offline practice, while the precondition is that you should run it with the internet at the first time.
Self Test Engine is suitable for windows operating system, running on the Java environment, and can install on multiple computers.
PDF Version: can be read under the Adobe reader, or many other free readers, including OpenOffice, Foxit Reader and Google Docs.
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Once download and installed on your PC, you can practice 640-821 test questions, review your questions & answers using two different options 'practice exam' and 'virtual exam'.
Virtual Exam - test yourself with exam questions with a time limit.
Practice Exam - review exam questions one by one, see correct answers.
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