Cisco 640-821 - Introduction to Cisco Networking Technologies

Cisco 640-821 Actual PDF
  • Exam Code: 640-821
  • Exam Name: Introduction to Cisco Networking Technologies
  • Updated: Sep 11, 2026
  • Q & A: 91 Questions and Answers
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Cisco 640-821 Exam Syllabus Topics:

SectionObjectives
Topic 1: WAN Technologies- PPP and Frame Relay basics (legacy)
- WAN connection types
Topic 2: IP Addressing and Subnetting- Basic subnetting calculations
- IPv4 addressing structure
- Subnet masks and CIDR notation
Topic 3: Network Security Basics- Basic access control concepts
- Device hardening overview
Topic 4: Network Fundamentals- Network topologies and components
- LAN/WAN concepts
- OSI and TCP/IP models
Topic 5: LAN Switching Technologies- Trunking basics
- Switch operation and MAC address table
- VLAN concepts
Topic 6: Routing Fundamentals- Routing table concepts
- Static routing basics
Topic 7: Cisco IOS Basics- Command line interface (CLI) navigation
- Basic device configuration
- Show and debug commands

Cisco Introduction to Cisco Networking Technologies Sample Questions:

Question #1

DRAG DROP
drag drop

Reveal Solution  Discussion  0

Correct Answer:

Question #2

A network administrator cannot get a router serial interface to become active. The administrator suspects that the problem may be the cable attached to the interface. The administrator is not at the same physical location as the router. Which Cisco IOS command allows the administrator to check the serial 0/0 cabling type?

  • A. show version
  • B. show startup-config
  • C. show controllers serial 0/0
  • D. show running-config
  • E. show interfaces serial 0/0
Reveal Solution  Discussion  0

Correct Answer: C  🗳️

Question #3

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 #4

What command will disable CDP on a router interface?

  • A. router(config-if)# no cdp enable
  • B. router(config-if)# no cdp active
  • C. router(config-if)# no cdp
  • D. router(config-if)# no cdp run
Reveal Solution  Discussion  0

Correct Answer: A  🗳️

Question #5

Refer to the graphic. A network associate is planning to copy a new IOS image into the
Paden router. This new image requires 8 MB of flash memory and 32 MB of RAM. How will the IOS proceed with the copy process?

  • A. During the copy process, the current IOS image will be erased.
  • B. The current IOS image must be manually erased before IOS will allow the new image to be copied.
  • C. The new IOS will be copied into flash memory and the current image will remain.
  • D. IOS will issue an error message because flash memory is not large enough to hold the new image.
Reveal Solution  Discussion  0

Correct Answer: C  🗳️

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