Introductory Networking

On annual leave so jumping back on TryHackMe to brush up on my cyber-skills.

In this article, I'm going to walk you through the Introductory networking room on TryHackMe.


Task 1: Introduction

This one is really simple just hit the complete button. No password required to progress

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Task 2: OSI Model

This task is pretty long, so I'll further split out the questions.

1. Which layer would choose to send data over TCP or UDP?

The Transport layer chooses which protocol to send data over.

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2. Which layer checks received packets to make sure that they haven't been corrupted?

The Data Link layer checks for corruption, as well as physical addressing of transmissions.

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3. In which layer would data be formatted in preparation for transmission?

The Data link layer formats data in preparation for transmission. As well as checking for corruption, as previously mentioned.

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4. Which layer transmits and receives data?

The Physical layer transmits and receives data. It also converts data to and from binary format; binary can be ingested and processed by the machine.

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5. Which layer encrypts, compresses, or otherwise transforms the initial data to give it a standardised format?

The Presentation layer encrypts, compressed and transforms data into a standardized format.

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6. Which layer tracks communications between the host and recieving computers?

The Session layer tracks and logs communications between the hosting and receiving computers.

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7. Which layer accepts communication requests from applications?

The Application layer (aptly named) accepts application communications. Apt-arently.

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8. Which layer handles logical addressing?

The Network layer handles logical addressing. For example, IP addressing. It allows categorizing and sorting of networks.

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9. When sending data over TCP, what would you call the "bite-sized" pieces of data?

They're called segments. When using UDP, they're called datagrams.

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10. Which layer would the FTP protocol communicate with?

As the FTP protocol will require an application, for example, an FTP client. It will communicate with the Application layer.

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11. Which transport layer protocol would be best suited to transmit live video?

UDP is best suited for live video. It favours speed, whereas TCP favours accuracy. If, for example, you were downloading a video, then TCP would be favoured. However, as live video is more concerned with speed and consistent transmission UDP is preferred.

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Task 3: Encapsulation

Not as long as the previous task, but builds upon it.

1. How would you refer to data at layer 2 of the encapsulation process?

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The data is/are referred to as Frames.

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2. How would you refer to data at layer 4 of the encapsulation process (with the OSI model), if the UDP protocol has been selected?

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Data at layer 4 (stage 4) is/are referred to as Datagrams when the UDP protocol is used.

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3. What process would a computer perform on a recieved message?

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The computer would perform de-encapsulation.

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4. Which is the only layer of the OSI model to add a trailer during encapsulation?

The Data Link layer adds a trailer during encapsulation.

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