During the data encapsulation process, which OSI layer adds a header that contains MAC addressing information and a trailer used for error checking?

• A.Network
• B.Transport
• C.Session
• D.Data Link

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A host is given the IP address 172.16.100.25 and the subnet mask 255.255.252.0.
What is the CIDR notation for this address?

• A.172.16.100.25 /23
• B.172.16.100.25 /20
• C.172.16.100.25 /21
• D.172.16.100.25 /22

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Drag and Drop Question
Move the protocols on the left to their characteristics on the right. Each protocol may be used once, more than once, or not at all.
Note: You will receive credit for each correct answer.

Correct Answer:

Explanation:
SFTP uses SSH for secure file transfer, so it supports SSH keys to verify the server and uses port 22 while providing confidentiality and integrity. TFTP is a lightweight file transfer protocol that uses UDP and port 69, making it suitable for simple transfers such as configuration backups and small file transfers within a LAN.

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A user at your company cannot connect to websites on the internet. However, they can connect to network resources on the company LAN.
You want to use the divide-and-conquer approach to troubleshoot the issue.
What should you do first?

• A.Run the Telnet command from the user's computer.
• B.Check the computer's network adapter.
• C.Check the computer's cable connections.
• D.Ping the default gateway from the user's computer.

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A Cisco switch is not accessible from the network. You need to view its running configuration.
Which out-of-band method can you use to access it?

• A.SNMP
• B.Console
• C.SSH
• D.Telnet

Correct Answer: B

Out-of-band management
When a Cisco switch is not accessible from the network, the recommended out-of-band method to access its running configuration is through the console port. Out-of-band management involves accessing the network device through a dedicated management channel that is not part of the data network. The console port provides direct access to the switch's Command Line Interface (CLI) without using the network, which is essential when the switch cannot be accessed remotely via the network12.
References :=
* Out-of-band (OOB) network interface configuration guidelines
* Out of band management configuration

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