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Updated: Aug 26, 2026
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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: | Simulation, Multiple Choice |
| 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 |
|---|---|
| Topic 1: Network Management and Troubleshooting | - Network monitoring basics - Basic troubleshooting techniques |
| Topic 2: IP Addressing and Routing Basics | - Basic routing concepts - IPv4 addressing and subnetting |
| Topic 3: Switching Fundamentals | - LAN switching concepts - VLAN basics |
| Topic 4: Network Media and Topologies | - WAN technologies overview - Ethernet LAN technologies |
| Topic 5: Cisco IOS and Device Operation | - Cisco IOS navigation and commands - Basic device configuration |
| Topic 6: Networking Fundamentals | - Network types and components - OSI and TCP/IP models |
Cisco Introduction to Cisco Networking Technologies Sample Questions:
Question 1
DRAG DROP
drag drop
Question 2
A router receives a packet on interface 172.16.45.66/26. The source IP of the packet is
172.16.45.126/26 and the destination is 172.16.46.191/26. How will the router handle the packet?
A. The destination is a broadcast address, so the router will not forward the packet.
B. The destination is a host on the same subnet, so the router will forward the packet.
C. The destination is a host on another subnet, so the router will not forward the packet.
D. The destination is a network address, so the router will forward the packet.
Question 3
How will a Cisco 2600 series router respond if the conditions listed below exist during the boot process?
1) The IOS image in flash is missing.
2) No network connectivity is available.
3) The router fallback IOS image is corrupt.
A. The boot will hang until an IOS is available.
B. The router will enter setup mode.
C. The router will enter ROM monitor mode.
D. The router will enter the prompted setup dialog.
E. The router will enter global configuration mode.
Question 4
Why is the show processes command used on a router before a debug command is entered?
A. to view the number of timers that are currently in use
B. to verify the IOS version that is running
C. to check if the load meter file has enough space left to store the output of the debug command
D. to verify that the CPU utilization is low enough to handle the effects of a debug command
E. to verify the amount of space in flash memory
Question 5
Host A needs to communicate with the email server shown in the graphic. What address will be placed in the destination address field of the frame when it leaves Host A?
A. the MAC address of E1 of the router
B. the MAC address of E0 of the router
C. the MAC address of the email server
D. the MAC address of Host A
E. the MAC address of Switch 1
F. the MAC address of Switch 2
Solutions:
| Question 1 Answer: Only visible for members | Question 2 Answer: A | Question 3 Answer: C | Question 4 Answer: D | Question 5 Answer: B |
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