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Exam Code: 640-821

Exam Name: Introduction to Cisco Networking Technologies

Updated: Sep 04, 2025

Number: 91 Q&As with Testing Engine

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Exam IntroProduct ScreenshotsFAQ

Cisco Introduction to Cisco Networking Technologies Sample Questions:

1. What two commands can be used to view the amount of memory that is used to hold the router IOS? (Choose two.)

A) Router# show version
B) Router# show running-config
C) Router# show memory
D) Router# show flash memory
E) Router# show flash

2. Refer to the graphic. A Cisco router and a Catalyst switch are connected as shown. The technician is working on a computer that is connected to the management console of the switch. In order to configure the default gateway for the switch, the technician needs to learn the IP address of the attached router interface. Which IOS command will provide this information in the absence of Layer 3 connectivity?

A) show dhcp-config
B) show ip neighbors
C) show ip rarp
D) show cdp neighbors detail
E) ping switch_ip_address
F) ping router_ip_address

3. What is ROM Monitor (ROMMON)?

A) a memory management tool
B) the source of the primary Cisco IOS software image
C) temporary storage space for the router operating files
D) a memory component for storing the saved configuration file
E) an operating system used for hardware troubleshooting and for password recovery

4. DRAG DROP
drag drop

5. 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 startup-config
B) show controllers serial 0/0
C) show version
D) show interfaces serial 0/0
E) show running-config

Solutions:

Question # 1
Answer: A,E

Question # 2
Answer: D

Question # 3
Answer: E

Question # 4
Answer: Only visible for members

Question # 5
Answer: B

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