Graded Discussion Board (GDB) of CS610 computer networks from 12:00 AM July 4, 2012 to July 5, 2012 till 11:59

GDB Dated: Jun 28, 12

Dear Students,

Note that the Graded Discussion Board (GDB) of CS610 computer networks will remain open for two days from 12:00 AM July 4, 2012 to July 5, 2012 till 11:59 PM according to Pakistan Standard Time.

The topic of Graded Discussion Board:

“Do you think wireless networks will totally replace the wired or fixed networks in coming future? Prove validity of your opinion.”

A concise, coherent and to the point comment is preferred over lengthy comment having irrelevant details. Your comment must not be more than 5-7 lines. Comments, posted on regular Lesson's MDB or sent through email will not be considered in any case. Any request about such an acceptance will not be catered.

CS610 Assignment No 05 Solution & Discussion Due Date:28-06-2012

Objective
The assignment has been designed to develop the understanding of IPv6 and UDP.

Q.1. Why does IPv6 use separate extension headers instead of fields in a single, fixed header? [5 Marks]

Q.2. What endpoint values must be specified by an application that engages in 1-to-1 communication? In 1-to-many? In many-to-1? [5 Marks]

Q.3. Calculate the size of the largest possible UDP message. (Hint: the entire UDP message must fit in an IP datagram.)

Assignment No. 3 Semester Spring 2012 Computer Networks – CS610

Assignment No. 3
Semester Spring 2012
Computer Networks – CS610
Total Marks: 15
Due Date: 4th Jun 2012
Objective
The assignment has been designed to develop the understanding TCP/IP and Label Switching.
Instructions:
Please read the following instructions carefully before solving & submitting assignment:
Assignment should be in your own wordings not copied from internet, handouts or books.
It should be clear that your assignment will not get any credit (zero marks) if:
· The assignment is submitted after due date.
· The submitted assignment does not open or file is corrupt.
· The assignment not submitted in MS Word file format.
· The assignment is copied (from other student or copied from handouts or internet).
· Student ID is not mentioned in the assignment file or name of file is other than student ID.
For any query about the assignment, contact at CS610@vu.edu.pk
GOOD LUCK



Q.1. Which TCP/IP layers are equivalent to OSI layers? Draw a diagram to explain. [10 Marks]



Q.2. Name a current technology that arose from ATM and how this technology follows the ATM
technology.[5Marks]

Assignment No. 3 Semester Spring 2012 Computer Networks – CS610

Q.1. Which TCP/IP layers are equivalent to OSI layers? Draw a diagram to explain. [10 Marks]



Q.2. Name a current technology that arose from ATM and how this technology follows the ATM  
technology.[5Marks]

CS610 GDB Solution & Discussion Last Date:24-01-2012

GDB will remain open for two consecutive working days. For this you have choice to post your comments from 23^rd January to 24^th January.

Topic:

How can secure LAN network? And which technology is better for it. Argue your answer with detail reason.

Instructions:A concise, coherent and to the point comments are preferred over lengthy comment having irrelevant details. Your comments must not be more than 5-7 lines.

Read more: CS610 GDB Solution & Discussion Last Date:24-01-2012 - Virtual University of Pakistan http://vustudents.ning.com/group/cs610computernetwork/forum/topics/cs610-gdb-solution-discussion-last-date-24-01-2012#ixzz1k4iYAUPM

Helping MAterial

Ethernet LAN Security

The Ethernet LAN has many security weaknesses when facing attacks externally and internally. Security measures must be taken to ensure an secured environment for communications ever the Etehrnet LAN. The following are some key risks in an Ethernet LAN:

• The primary weakness with Ethernet is that it is a broadcast system . Every message sent out by any computer on an Ethernet LAN segment reaches all parts of that segment and potentially could be read by any computer on the segment. Sniffing type programs can record, read and analyze all the messages on a segment. Actually others can read your password and subsequently login to any account. They can also change the information and forge totally different messages.
• Peer-to-Peer networking systems (both Windows and Macintosh AppleTalk) for Workgroups allow people on the network to share files and printers, which open up your files to anyone using another computer in the group.
• Some applications, such as FTP program which allows you to get files from and send files to another computer, may have an option in their configuration which allow other computers to get into your computer and have access to your files while the program is running .
• Previligies of the operating system of a server in the Ethernet maybe incorrectly configured and users may have unintentional access to sensitive parts of the file store.
• If the NFS (Network File System) is deployed in an Ethernet LAN and the NFS part of a file store on a remote computer, the contents of the files can be snooped when reading or writing a file to the NFS drive.
• It is relatively easy in an Ethernet LAN to fake an Email message and other messages which purports to come from someone else. It is also possible to forge a login session by recording a legitimate one and running the recording later on.

There are many hardware and software solutions to address the above Ethernet LAN security issues:

Hardware Solutions for Ethernet LAN Security

• Use a switched network: A switch can segregate a network into many parts which can effectively preventing snooping and sniffing on a network. These switches also reduce network traffic by limiting messages to only the parts of the network on which they are needed to improve the efficiency of the whole network.
• Bridges and Routers: Bridges and routers are electronic filters which only pass a network message through themselves if the destination lies on the other side of the filter. Consequently if "the snooper" is on one side of a bridge or router they will not see any traffic passing between computers on the other side of the filter.
• Lan Security Architecture (LSA): a proprietary technique where twisted pair hubs inspect incoming messages and will only transmit them unscrambled to the destination computer. All other computers on the hub receive scrambled messages.

Software Solutions for Ethernet LAN Security

• Encryption: Encrypting the data passing between your computer and its destination. There are many encryption technologies and product available which effective protect information and data privacy. The popular encryption methods used are PGP (Pretty Good Privacy).
• Authentication: Use user name and password to authenticate users. It is necessary to encrypt the password and implement timestamps making forgery extremely difficult.
• Combination technologies: Many new technologies are available which doing both authentication and encryption. One of such technologies is Kerberos which uses tokens, timestamps, tickets and encryption to make transactions between computers secure.

Many n etwork security technologies at the layer 3 (the network layer) can also be deployed to address the Layer 2 (Ethernet layer) security vulnebilities.

Read more: CS610 GDB Solution & Discussion Last Date:24-01-2012 - Virtual University of Pakistan http://vustudents.ning.com/group/cs610computernetwork/forum/topics/cs610-gdb-solution-discussion-last-date-24-01-2012#ixzz1k4ifzuHP

CS610 Assignment No.5 FALL 2011

CS 610 Computer Networks

Assignment # 05

FALL 2011

Total Marks = 20

Deadline

Your assignment must be uploaded / submitted before or on January 16, 2011

Upload Instructions

Please view the assignment submission process document provided to you by the

Virtual University of Pakistan.

Rules for Marking

Please note that your assignment will not be graded if:

• It is submitted after due date

• The file you uploaded does not open

• The file you uploaded is copied from someone else or from internet.

• It is in some format other than .doc

Objective

The objective of this assignment is to give you practice in critically review the research paper related to the new trends in computer network. After preparing this assignment, you will be able to review and analysis of the research paper.

Note: Material that is an exact copy from other student assignment would be graded zero marks. Please write in your own words.

Assignment Statements:

The research paper is already uploaded on LMS (course announcement). The title of research paper is “Network Security: It is a process, not a product”.

Please provide brief answer to each question (maximum 5 lines) related to this paper. Write all questions in your own words.

Q1. If DOS attack happens in your network then which precautionary measures will you take to prevent that?                                                                          Marks 10

Q2. In how many ways can we detect system against cyber attacks?

                                                                                                                     Marks 10

CS 610 Computer Networks Assignment # 04 FALL 2011

CS 610 Computer Networks

Assignment # 04

FALL 2011

Total Marks = 20

Deadline

Your assignment must be uploaded / submitted before or on January 10, 2011          

Upload Instructions

Please view the assignment submission process document provided to you by the

Virtual University of Pakistan.

Rules for Marking

Please note that your assignment will not be graded if:

• It is submitted after due date.

• The file you uploaded does not open.

• The file you uploaded is copied from someone else or from internet.

• It is in some format other than .doc

Objective

The assignment has been designed to develop the understanding about the concept of

Datagram transmission and Internet Control Message Protocol.

Note: Material that is an exact copy from handouts or internet would be graded

zero marks. Your solution should consist of the material found through different sources and written in your own words.

Assignment Statements:

Q1. If the application selects a datagram size greater than MTU along the path to the destination. How to handle this situation? Illustrate your answer with your own words.

Q2: How can ICMP be used for automated tool and Path discovery? Illustrate your answer with your own words.

CS610 Assignment No.3 Solution & Discussion Fall 2011 Read more: CS610 Assignment No.3 Solution & Discussion Fall 2011

Assignment Statements:

Q1: A task is assigned to network engineer to build a large network within two branches. Both branches are using different vendor products; he has to connect both branches. Which network device performs internetworking between them? Describe the functionality of device in four to five lines.                                Marks: 10       

Solution:

Q2.Consider the IP addresses: 179.225.120.5 and the corresponding subnet masks 255.255.255.0, then find out the following:                                                  Marks: 10

Question	Answer
a. The number of bits used for subnetting
b. Total number of host in the subnet
c. The network address of the subnet.
d. Broadcast address for this subnet
e. IP address of fist host on this subnet
f. IP address of last host on this subnet
g. Network Class

Read more: CS610 Assignment No.3 Solution & Discussion Fall 2011 - Virtual University of Pakistan http://vustudents.ning.com/group/cs610computernetwork/forum/topics/cs610-assignment-no-3-solution-discussion-fall-2011#ixzz1i80m4Kj8