diff --git a/hw2/src/impl/GBNTReceiver.java b/hw2/src/impl/GBNTReceiver.java
index 427f06a..fc61593 100644
--- a/hw2/src/impl/GBNTReceiver.java
+++ b/hw2/src/impl/GBNTReceiver.java
@@ -8,9 +8,6 @@
  * value of the receiver disconnection timeout.
  */
 
-
-package impl;
-
 import transport.Receiver;
 import transport.TimeoutAction;
 
diff --git a/hw2/src/impl/GBNTSender.java b/hw2/src/impl/GBNTSender.java
index 00f69d3..2c87fc6 100644
--- a/hw2/src/impl/GBNTSender.java
+++ b/hw2/src/impl/GBNTSender.java
@@ -8,8 +8,6 @@
  * fixed window.
  */
 
-package impl;
-
 import transport.TimeoutAction;
 
 import java.util.*;
diff --git a/hw2/src/impl/README b/hw2/src/impl/README
new file mode 100644
index 0000000..2060f1a
--- /dev/null
+++ b/hw2/src/impl/README
@@ -0,0 +1,8 @@
+Go back N - T
+Computer Networking Asignment 2
+
+Claudio Maggioni (2020)
+
+No external sources other than class material were used to do the assignment.
+The solution is complete.
+No special build instructions are required to use the classes.
diff --git a/hw3/.gitignore b/hw3/.gitignore
new file mode 100644
index 0000000..92bdad5
--- /dev/null
+++ b/hw3/.gitignore
@@ -0,0 +1,569 @@
+## Core latex/pdflatex auxiliary files:
+
+*.aux
+
+*.lof
+
+*.log
+
+*.lot
+
+*.fls
+
+*.out
+
+*.toc
+
+*.fmt
+
+*.fot
+
+*.cb
+
+*.cb2
+
+.*.lb
+
+
+
+## Intermediate documents:
+
+*.dvi
+
+*.xdv
+
+*-converted-to.*
+
+# these rules might exclude image files for figures etc.
+
+# *.ps
+
+# *.eps
+
+# *.pdf
+
+
+
+## Generated if empty string is given at "Please type another file name for output:"
+
+.pdf
+
+
+
+## Bibliography auxiliary files (bibtex/biblatex/biber):
+
+*.bbl
+
+*.bcf
+
+*.blg
+
+*-blx.aux
+
+*-blx.bib
+
+*.run.xml
+
+
+
+## Build tool auxiliary files:
+
+*.fdb_latexmk
+
+*.synctex
+
+*.synctex(busy)
+
+*.synctex.gz
+
+*.synctex.gz(busy)
+
+*.pdfsync
+
+
+
+## Build tool directories for auxiliary files
+
+# latexrun
+
+latex.out/
+
+
+
+## Auxiliary and intermediate files from other packages:
+
+# algorithms
+
+*.alg
+
+*.loa
+
+
+
+# achemso
+
+acs-*.bib
+
+
+
+# amsthm
+
+*.thm
+
+
+
+# beamer
+
+*.nav
+
+*.pre
+
+*.snm
+
+*.vrb
+
+
+
+# changes
+
+*.soc
+
+
+
+# comment
+
+*.cut
+
+
+
+# cprotect
+
+*.cpt
+
+
+
+# elsarticle (documentclass of Elsevier journals)
+
+*.spl
+
+
+
+# endnotes
+
+*.ent
+
+
+
+# fixme
+
+*.lox
+
+
+
+# feynmf/feynmp
+
+*.mf
+
+*.mp
+
+*.t[1-9]
+
+*.t[1-9][0-9]
+
+*.tfm
+
+
+
+#(r)(e)ledmac/(r)(e)ledpar
+
+*.end
+
+*.?end
+
+*.[1-9]
+
+*.[1-9][0-9]
+
+*.[1-9][0-9][0-9]
+
+*.[1-9]R
+
+*.[1-9][0-9]R
+
+*.[1-9][0-9][0-9]R
+
+*.eledsec[1-9]
+
+*.eledsec[1-9]R
+
+*.eledsec[1-9][0-9]
+
+*.eledsec[1-9][0-9]R
+
+*.eledsec[1-9][0-9][0-9]
+
+*.eledsec[1-9][0-9][0-9]R
+
+
+
+# glossaries
+
+*.acn
+
+*.acr
+
+*.glg
+
+*.glo
+
+*.gls
+
+*.glsdefs
+
+*.lzo
+
+*.lzs
+
+
+
+# uncomment this for glossaries-extra (will ignore makeindex's style files!)
+
+# *.ist
+
+
+
+# gnuplottex
+
+*-gnuplottex-*
+
+
+
+# gregoriotex
+
+*.gaux
+
+*.gtex
+
+
+
+# htlatex
+
+*.4ct
+
+*.4tc
+
+*.idv
+
+*.lg
+
+*.trc
+
+*.xref
+
+
+
+# hyperref
+
+*.brf
+
+
+
+# knitr
+
+*-concordance.tex
+
+# TODO Uncomment the next line if you use knitr and want to ignore its generated tikz files
+
+# *.tikz
+
+*-tikzDictionary
+
+
+
+# listings
+
+*.lol
+
+
+
+# luatexja-ruby
+
+*.ltjruby
+
+
+
+# makeidx
+
+*.idx
+
+*.ilg
+
+*.ind
+
+
+
+# minitoc
+
+*.maf
+
+*.mlf
+
+*.mlt
+
+*.mtc[0-9]*
+
+*.slf[0-9]*
+
+*.slt[0-9]*
+
+*.stc[0-9]*
+
+
+
+# minted
+
+_minted*
+
+*.pyg
+
+
+
+# morewrites
+
+*.mw
+
+
+
+# nomencl
+
+*.nlg
+
+*.nlo
+
+*.nls
+
+
+
+# pax
+
+*.pax
+
+
+
+# pdfpcnotes
+
+*.pdfpc
+
+
+
+# sagetex
+
+*.sagetex.sage
+
+*.sagetex.py
+
+*.sagetex.scmd
+
+
+
+# scrwfile
+
+*.wrt
+
+
+
+# sympy
+
+*.sout
+
+*.sympy
+
+sympy-plots-for-*.tex/
+
+
+
+# pdfcomment
+
+*.upa
+
+*.upb
+
+
+
+# pythontex
+
+*.pytxcode
+
+pythontex-files-*/
+
+
+
+# tcolorbox
+
+*.listing
+
+
+
+# thmtools
+
+*.loe
+
+
+
+# TikZ & PGF
+
+*.dpth
+
+*.md5
+
+*.auxlock
+
+
+
+# todonotes
+
+*.tdo
+
+
+
+# vhistory
+
+*.hst
+
+*.ver
+
+
+
+# easy-todo
+
+*.lod
+
+
+
+# xcolor
+
+*.xcp
+
+
+
+# xmpincl
+
+*.xmpi
+
+
+
+# xindy
+
+*.xdy
+
+
+
+# xypic precompiled matrices and outlines
+
+*.xyc
+
+*.xyd
+
+
+
+# endfloat
+
+*.ttt
+
+*.fff
+
+
+
+# Latexian
+
+TSWLatexianTemp*
+
+
+
+## Editors:
+
+# WinEdt
+
+*.bak
+
+*.sav
+
+
+
+# Texpad
+
+.texpadtmp
+
+
+
+# LyX
+
+*.lyx~
+
+
+
+# Kile
+
+*.backup
+
+
+
+# gummi
+
+.*.swp
+
+
+
+# KBibTeX
+
+*~[0-9]*
+
+
+
+# TeXnicCenter
+
+*.tps
+
+
+
+# auto folder when using emacs and auctex
+
+./auto/*
+
+*.el
+
+
+
+# expex forward references with \gathertags
+
+*-tags.tex
+
+
+
+# standalone packages
+
+*.sta
+
+
+
+# Makeindex log files
+
+*.lpz
+
+
+
+# xwatermark package
+
+*.xwm
+
+
+
+# REVTeX puts footnotes in the bibliography by default, unless the nofootinbib
+
+# option is specified. Footnotes are the stored in a file with suffix Notes.bib.
+
+# Uncomment the next line to have this generated file ignored.
+
+#*Notes.bib
+
+
diff --git a/hw3/hw3.pdf b/hw3/hw3.pdf
new file mode 100644
index 0000000..77a56d3
Binary files /dev/null and b/hw3/hw3.pdf differ
diff --git a/hw3/hw3.tex b/hw3/hw3.tex
new file mode 100644
index 0000000..88c53b8
--- /dev/null
+++ b/hw3/hw3.tex
@@ -0,0 +1,45 @@
+\documentclass[12pt,a4paper]{article}
+
+\usepackage[utf8]{inputenc} \usepackage[margin=2cm]{geometry}
+\usepackage{amstext} \usepackage{amsmath} \usepackage{array}
+\newcommand{\lra}{\Leftrightarrow}
+
+\title{Howework 3 -- Computer Networking}
+
+\author{Claudio Maggioni}
+
+\begin{document} \maketitle
+\section*{Exercise 1}
+The EUI-48 MAC address space can have $2^{48} = 281474976710656$ possible addresses. The IPv4 address space has $2^32 = 4294967296$
+addresses while IPv6 has = $2^{128} \approx 3,402823669209385 \cdot 10^{38}$ addresses. In practice, some of the addresses in
+ these spaces may be reserved for special purposes (e.g.
+  \texttt{FF:FF:FF:FF:FF:FF} as the broadcast MAC address or the
+   \texttt{127.0.0.0/8} subnet reserved for loopback networks 
+    in IPv4) so the number of usable addresses is smaller than
+     these figures.
+
+\section*{Exercise 2}
+$$D = 1010100000_2 = 512_{10} + 128_{10} + 32_{10} = 672_{10}$$
+$$G = 10011_2 = 19_{10}$$
+$$r = |G| - 1 = 4$$ 
+$$R =D \cdot 2^r \mod G = 10752 \mod 19 = 17$$
+
+\section*{Exercise 3}
+
+For 10 Mbps:
+
+$$t = \frac{100 \cdot 512 b}{10^7\frac{b}{s}} = 5.12 ms$$ 
+
+For 100 Mbps:
+
+$$t = \frac{100 \cdot 512 b}{10^8\frac{b}{s}} = 0.512 ms$$ 
+
+\section*{Exercise 4}
+A mechanism that an AP can use to maintain constant reliability (e.g. constant BER) while communicating with a station that is getting farther away from it is to use rate adaptation: once transmission errors are detected through ARQ checks, the AP can switch to a lower transmission rate (akin to TCP's congestion control mechanisms) to counteract interference and lowering signal strength.
+
+The AP may also decide to boost its transmission power if possible, thus increasing signal strength. However, this technique does not provide a linear increase in signal strength since obstacles or powerful interferences may be present.
+
+In alternative, if the station is in a ESS and another AP is present in the same subnet, the station may decide to hop from the first AP to the new AP if the latter has a better RSSI. If the DS uses switches, those should be informed of the change of BSS so as to keep their switching tables updated. 
+
+
+\end{document}