Online Access Free 640-821 Practice Test

Exam Code:640-821
Exam Name:Introduction to Cisco Networking Technologies
Certification Provider:Cisco
Free Question Number:91
Posted:Oct 12, 2026
Rating
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Question 1

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?

Question 2

What data structure is described in the graphic?

Question 3

Which IP address is a private address?

Question 4

Refer to the exhibit. A person is trying to send a file from a host on Network A of the JAX
Company to a server on Network Z of the XYZ Company. The file transfer fails. The host on Network A can communicate with other hosts on Network A.
Which command, issued
from router RTA, would be the most useful for troubleshooting this problem?

Question 5

According to the information provided in the exhibit, from where was the currently running version of IOS loaded?

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