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cnp3-ebook / exercises/reliability — English

Checksums and CRCs should not be confused with secure hash functions such as MD5 defined in :rfc:`1321` or SHA-1 described in :rfc:`4634`. Secure hash functions are used to ensure that files or sometimes frames/packets/segments have not been modified. Secure hash functions aim at detecting malicious changes while checksums and CRCs only detect random transmission errors. Use the `shasum <http://linux.die.net/man/1/shasum>`_ or `md5sum <http://linux.die.net/man/1/md5sum>`_ programs on Linux to perform the same tests as above.
Checksums and CRCs should not be confused with secure hash functions such as MD5 defined in :rfc:`1321` or SHA-1 described in :rfc:`4634`. Secure hash functions are used to ensure that files or sometimes frames/packets/segments have not been modified. Secure hash functions aim at detecting malicious changes while checksums and CRCs only detect random transmission errors. Use the `shasum <http://linux.die.net/man/1/shasum>`_ or `md5sum <http://linux.die.net/man/1/md5sum>`_ programs on Linux to perform the same tests as above.
2 years ago
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By using your knowledge of the Internet checksum, can you find a transmission error that will not be detected by these checksums?
By using your knowledge of the Internet checksum, can you find a transmission error that will not be detected by these checksums?
2 years ago
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cnp3-ebook / exercises/reliability — English

the Fletcher checksum [Fletcher1982]_, see https://en.wikipedia.org/wiki/Fletcher%27s_checksum for implementation details.
the Fletcher checksum [Fletcher1982]_, see https://en.wikipedia.org/wiki/Fletcher%27s_checksum for implementation details.
2 years ago
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cnp3-ebook / exercises/reliability — English

when the third and seventh frames are lost
when the third and seventh frames are lost
2 years ago
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cnp3-ebook / exercises/reliability — English

Consider a go-back-n sender and a go-back receiver that are directly connected with a 10 Mbps link that has a propagation delay of 100 milliseconds. Assume that the retransmission timer is set to three seconds. If the window has a length of 4 frames, draw a time-sequence diagram showing the transmission consisting of 10 data frames (each frame contains 10000 bits):
Consider a go-back-n sender and a go-back receiver that are directly connected with a 10 Mbps link that has a propagation delay of 100 milliseconds. Assume that the retransmission timer is set to three seconds. If the window has a length of 4 frames, draw a time-sequence diagram showing the transmission consisting of 10 data frames (each frame contains 10000 bits):
2 years ago
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To speedup the transmission of the frames, a student proposes to compute the CRC over the data part of the frame but not over the header. What do you think of this proposed solution ?
To speedup the transmission of the frames, a student proposes to compute the CRC over the data part of the frame but not over the header. What do you think of this proposed solution ?
2 years ago
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cnp3-ebook / exercises/reliability — English

Consider a `b` bits per second link between two hosts that has a propagation delay of `t` seconds. Derive a formula that computes the time elapsed between the transmission of the first bit of a `d` bytes frame from a sending host and the reception of the last bit of this frame on the receiving host.
Consider a `b` bits per second link between two hosts that has a propagation delay of `t` seconds. Derive a formula that computes the time elapsed between the transmission of the first bit of a `d` bytes frame from a sending host and the reception of the last bit of this frame on the receiving host.
2 years ago
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cnp3-ebook / exercises/network — English

File locale/pot/exercises/network.pot was added. 2 years ago
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cnp3-ebook / exercises/network — English

Discussion questions
Discussion questions
2 years ago
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Found duplicated string

cnp3-ebook / exercises/network — English

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cnp3-ebook / exercises/network — English

Are these paths possible with link-state or distance vector routing ? If so, how do you configure the link weights? If not, explain your answer.
Are these paths possible with link-state or distance vector routing ? If so, how do you configure the link weights? If not, explain your answer.
2 years ago
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cnp3-ebook / exercises/network — English

In the five nodes network shown above, can you configure the link weights so that the packets sent by router `R5` (resp. `R4`) follow the `R5->R3->R1` path (resp. `R4->R2->R3->R1`) ?
In the five nodes network shown above, can you configure the link weights so that the packets sent by router `R5` (resp. `R4`) follow the `R5->R3->R1` path (resp. `R4->R2->R3->R1`) ?
2 years ago
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In the five nodes network shown below, can you configure the link metrics so that the packets sent by router `R5` to router `R1` use link `R3->R1` while the packets sent by router `R3` use links `R3->R2` and `R2->R1`?
In the five nodes network shown below, can you configure the link metrics so that the packets sent by router `R5` to router `R1` use link `R3->R1` while the packets sent by router `R3` use links `R3->R2` and `R2->R1`?
2 years ago
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cnp3-ebook / exercises/network — English

In your daily life, you also use hierarchical and flat address spaces. Can you provide examples of these two types of addresses and discuss the benefits of using a hierarchical or flat addressing space in their particular context ?
In your daily life, you also use hierarchical and flat address spaces. Can you provide examples of these two types of addresses and discuss the benefits of using a hierarchical or flat addressing space in their particular context ?
2 years ago
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cnp3-ebook / exercises/network — English

Open questions
Open questions
2 years ago
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cnp3-ebook / exercises/network — English

Multiple-choice questions
Multiple-choice questions
2 years ago
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cnp3-ebook / exercises/network — English

Building a network
Building a network
2 years ago
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cnp3-ebook / exercises/ex-sharing — English

File locale/pot/exercises/ex-sharing.pot was added. 2 years ago
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This is an unpolished draft of the third edition of this e-book. If you find any error or have suggestions to improve the text, please create an issue via https://github.com/CNP3/ebook/issues?milestone=4 or help us by providing pull requests to close the existing issues.
This is an unpolished draft of the third edition of this e-book. If you find any error or have suggestions to improve the text, please create an issue via https://github.com/CNP3/ebook/issues?milestone=4 or help us by providing pull requests to close the existing issues.
2 years ago
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cnp3-ebook / index — English

File locale/pot/index.pot was added. 2 years ago

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