Cisco 640-821 : Introduction to Cisco Networking Technologies

  • Exam Code: 640-821
  • Exam Name: Introduction to Cisco Networking Technologies
  • Updated: Sep 12, 2026
  • Q & A: 91 Questions and Answers

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Cisco 640-821 Exam Syllabus Topics:

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

Cisco Introduction to Cisco Networking Technologies Sample Questions:

Question #1

Refer to the graphic. What is the purpose of the two numbers shown following the exec- timeout command?

  • A. If no router activity has been detected in one hour and 55 minutes, the console will be locked out.
  • B. If no commands have been typed in one minute and 55 seconds, the console connection will be closed.
  • C. If no commands have been typed in 55 seconds, the console connection will be closed.
  • D. If connected to the router by Telnet, input must be detected within one hour and 55 seconds or the connection will be closed.
  • E. If connected to the router by Telnet, input must be detected within one minute and 55 seconds or the connection will be closed.
Reveal Solution  Discussion  0

Correct Answer: B  🗳️

Question #2

Refer to the exhibit. If host A sends an IP packet to host B, what will the OSI Layer 3 source address be in the packet when it reaches host B?

  • A. 10.168.11.65
  • B. C3:C3:C3:C3:C3:C3
  • C. B2:B2:B2:B2:B2:B2
  • D. 10.168.11.88
  • E. 10.168.10.99
  • F. A1:A1:A1:A1:A1:A1
Reveal Solution  Discussion  0

Correct Answer: E  🗳️

Question #3

What command will disable CDP on a router interface?

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

Correct Answer: B  🗳️

Question #4

lab

Reveal Solution  Discussion  0

Correct Answer:

Shore(config)# interface eth0
Shore(config-if)# ip address 192.168.195.113 255.255.255.240
Shore(config-if)# no shutdown
Shore(config-if)# exit
Shore(config)# interface ser0
Shore(config-if)# ip address 192.168.195.33 255.255.255.240
Shore(config-if)# no shutdown
Shore(config-if)# exit
Shore(config)# router rip
Shore(config-router)# network 192.168.195.0
Shore(config-router)# end
Shore# copy run start

Question #5

What is the difference between the Cisco router IOS commands show cdp neighbor detail and show cdp entry?

  • A. The show cdp neighbor detail command shows neighbor information for a single neighbor only, while show cdp entry displays detailed output on each neighbor known.
  • B. The show cdp neighbor detail command shows all neighbor information, while show cdp entry displays only one line of output for each neighbor.
  • C. The show cdp entry command shows neighbor information for all neighbors with one line of output for each, while show cdp neighbor detail lists each neighbor with detailed output on each.
  • D. The show cdp entry command shows neighbor information for specific neighbors only, while show cdp neighbor detail lists each neighbor with detailed output on each.
Reveal Solution  Discussion  0

Correct Answer: D  🗳️

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