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Cisco 640-821 exam : Introduction to Cisco Networking Technologies

640-821 Exam Simulator
  • Exam Code: 640-821
  • Exam Name: Introduction to Cisco Networking Technologies
  • Updated: Sep 16, 2026
  • Q & A: 91 Questions and Answers
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Cisco 640-821 Exam Syllabus Topics:

SectionObjectives
Topic 1: Network Management and Troubleshooting- Basic troubleshooting techniques
- Network monitoring basics
Topic 2: Networking Fundamentals- OSI and TCP/IP models
- Network types and components
Topic 3: Switching Fundamentals- VLAN basics
- LAN switching concepts
Topic 4: Network Media and Topologies- Ethernet LAN technologies
- WAN technologies overview
Topic 5: Cisco IOS and Device Operation- Basic device configuration
- Cisco IOS navigation and commands
Topic 6: IP Addressing and Routing Basics- IPv4 addressing and subnetting
- Basic routing concepts

Cisco Introduction to Cisco Networking Technologies Sample Questions:

Question #1

HOTSPOT
lab



Reveal Solution  Discussion  0

Correct Answer:

Question #2

Which IOS user EXEC command will allow a network technician to determine which router in the path to an unreachable network host should be examined more closely for the cause of the network failure?

  • A. Router> show interface
  • B. Router> show cdp neighbors
  • C. Router> ping
  • D. Router> telnet
  • E. Router> trace
  • F. Router> show ip route
Reveal Solution  Discussion  0

Correct Answer: E  🗳️

Question #3

The routers in the diagram are being used to prototype a WAN. The two routers are interconnected with back-to-back cables between their serial interfaces. How should the serial interface of the Test1 router be configured to establish Layer 3 connectivity between the two routers?

  • A. Test1(config)#interface serial 3
    Test1(config-if)# clock rate 64000
    Test1(config-if)# no shutdown
  • B. Test1(config)#interface serial 3
    Test1(config-if)# ip address 192.168.10.3 255.255.255.0
    Test1(config-if)# clock rate 64000
  • C. Test1(config)#interface serial 3
    Test1(config-if)# ip address 192.168.10.3 255.255.255.0
    Test1(config-if)# clock rate 64000
    Test1(config-if)# no shutdown
  • D. Test1(config)#interface serial 3
    Test1(config-if)# ip address 192.168.10.3 255.255.255.0
    Test1(config-if)# no shutdown
Reveal Solution  Discussion  0

Correct Answer: D  🗳️

Question #4

What determines the IOS that the router will load?

  • A. the configuration register and boot system commands
  • B. the load register and the startup system command
  • C. the configuration register and the setup command
  • D. the boot register and the startup system command
  • E. the start up register and startup system command
Reveal Solution  Discussion  0

Correct Answer: A  🗳️

Question #5

DRAG DROP
drag drop

Reveal Solution  Discussion  0

Correct Answer:

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