# COMP90007 Internet Technologies Assignment 1 solution

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## Description

Question 1 (1 point)
In a network with a 6-layer architecture and protocol hierarchy, applications generate
messages of length M bytes. Assuming each layer has a different header size: 20-byte, 30-
byte, 80-byte, 30-byte, 20-byte and 110-bytes for Layers 1, 2, 3, 4, 5, and 6 respectively: What
briefly explain.
Question 2 (1 point)
An image is 1920 x 1080 pixels with 2KB/pixel (KB is Kilobyte). Assume the image is stored as
an uncompressed simple image file. If the distance between the sender and the receiver is
10,000 km, what is the latency to send this image 1) over a 56-kbps simple modem? 2) over a
1-Mbps cable modem? (Assume the speed of the signal for both cases is 200,000 km/second).
Question 3 (1 point)
Given a channel with 4 kHz bandwidth, if we want to send data at 56 kbps, what is the
minimum signal-to-noise ratio of the channel that can support this data rate?
Question 4 (1 point)
1) A stream of bits, 01111011111011111101111100, needs to be transmitted at the
data link layer using bit stuffing, what is actually transmitted after the bit stuffing?
2) We are transmitting 16-bit data using a Hamming code. What is the minimum
number of check bits is needed to ensure that the receiver can correct a single-bit
error?
Question 5 (1 point)