Cisco 640-821 Exam : Introduction to Cisco Networking Technologies

640-821
  • Exam Code: 640-821
  • Exam Name: Introduction to Cisco Networking Technologies
  • Updated: Sep 15, 2026
  • Q & A: 91 Questions and Answers

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Cisco 640-821 Exam Syllabus Topics:

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

Cisco Introduction to Cisco Networking Technologies Sample Questions:

Question #1

Refer to the exhibit. SwitchA receives the frame with the addressing shown. According to the command output also shown in the exhibit, how will SwitchA handle this frame?

  • A. It will drop the frame.
  • B. It will flood the frame out all ports except Fa0/3.
  • C. It will forward the frame out port Fa0/3 only.
  • D. It will flood the frame out all ports.
Reveal Solution  Discussion  0

Correct Answer: B  🗳️

Question #2

What is the purpose of using the copy flash tftp command on a router?

  • A. to backup the router configuration to a server
  • B. to create a backup copy of the IOS
  • C. to move the IOS image from a server to the router
  • D. to copy an IOS image to the router
Reveal Solution  Discussion  0

Correct Answer: B  🗳️

Question #3

Which IP address is a private address?

  • A. 172.20.14.36
  • B. 168.172.19.39
  • C. 172.33.194.30
  • D. 192.169.42.34
  • E. 12.0.0.1
Reveal Solution  Discussion  0

Correct Answer: A  🗳️

Question #4

A network administrator is having trouble with a remote router. The administrator connects to the router by Telnet and types a debug command, but no debug output appears on the screen. What command should the administrator type to view the debug output?

  • A. Router# debug all
  • B. Router# enable debug
  • C. Router# no debug *
  • D. Router# terminal monitor
  • E. Router# show debug
Reveal Solution  Discussion  0

Correct Answer: D  🗳️

Question #5

HOTSPOT
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Reveal Solution  Discussion  0

Correct Answer:

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