Embedded Files
Lab -7
Aim: To implement DNS using hash table implementation of Dictionaries
Introduction: The Domain name system (DNS) is a distributed database which provides a mapping from hostname to IP addresses. Hostnames are strings of characters like www.google.com. An IP4 address is a 32-bit quantity that is divided into 4 groups of 8 bits each. Each group is then converted into an integer number in the range 0 to 255. The aim of the experiment is to simulate a simple DNS that allows us to insert DNS records and also provide mapping from hostname to IP4 address using hash table.
Tasks:
Write a C/JAVA program to construct a dictionary using hash table using chaining with the following methods
a. Insert (hostname, ip_address)
b. Find(hostname)
Let table size be N = 53
Example: insert (google.com, 10.1.34.56)
a. Compute the polynomial hash code
= ASCII(g) + ASCII(o) * a + ASCII(o) * a2 + ASCII(g) * a3 + ASCII(l) * a4 + ASCII(e) * a5 + ASCII(c) * a6 + ASCII(o) * a7 + ASCII(m) * a8. Use a as 33.
b. Apply compression map as
c. Insert the pair (hostname, ip_address) in the list present at the index
Example: Find (google.com)
a. Compute the polynomial hash code
= ASCII(g) + ASCII(o) * a + ASCII(o) * a2 + ASCII(g) * a3 + ASCII(l) * a4 + ASCII(e) * a5 + ASCII(c) * a6 + ASCII(o) * a7 + ASCII(m) * a8. Use a as 33.
b. Apply compression map as
c. Display the IP4 address if the hostname is present in the list present at the index . Otherwise display no such element found.
Sample hostname, IP address pairs:
# News
bbc.co.uk 212.58.241.131
aljazeera.com 198.78.201.252
# Social media
reddit.com 72.247.244.88
imgur.com 173.231.140.219
google.com 172.217.11.174
youtube.com 74.125.65.91
yahoo.com 98.137.149.56
hotmail.com 65.55.72.135
bing.com 65.55.175.254
digg.com 64.191.203.30
theonion.com 97.107.137.164
hush.com 65.39.178.43
gamespot.com 216.239.113.172
ign.com 69.10.25.46
cracked.com 98.124.248.77
sidereel.com 144.198.29.112
github.com 207.97.227.239
# Torrent sites
thepiratebay.org 194.71.107.15
mininova.com 80.94.76.5
btjunkie.com 93.158.65.211
demonoid.com 62.149.24.66
demonoid.me 62.149.24.67
# Social networking
facebook.com 31.13.77.36
twitter.com 199.59.149.230
tumblr.com 174.121.194.34
livejournal.com 209.200.154.225
dreamwidth.org 69.174.244.50
# Live Streaming Content
stickam.com 67.201.54.151
blogtv.com 84.22.170.149
justin.tv 199.9.249.21
chatroulette.com 184.173.141.231
omegle.com 97.107.132.144
own3d.tv 208.94.146.80
megavideo.com 174.140.154.32
# Television
gorillavid.com 178.17.165.74
videoweed.com 91.220.176.248
novamov.com 91.220.176.248
tvlinks.com 208.223.219.206
1channel.com 208.87.33.151
# Shopping
amazon.com 72.21.211.176
newegg.com 216.52.208.187
frys.com 209.31.22.39
# File Sharing
mediafire.com 205.196.120.13
megaupload.com 174.140.154.20
fileshare.com 208.87.33.151
multiupload.com 95.211.149.7
uploading.com 195.191.207.40
warez-bb.org 31.7.57.13
hotfile.com 199.7.177.218
gamespy.com 69.10.25.46
what.cd 67.21.232.223
warez.ag 178.162.238.136
putlocker.com 89.238.130.247
uploaded.to 95.211.143.200
dropbox.com 199.47.217.179
pastebin.com 69.65.13.216
Lab-6
CSF211 Lab, 7-3-2018
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Write a C/JAVA program to read a set of student records (at least 20) from a file.
Assume that each student record contains Student name, ID no., enrollment year and Grade Point Average (GPA).
Sort the records based on Student name using quick sort and display the result.
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