CS601 - Data Communication GDB No. 01 Solution and Discussion Spring 2013 Due Date jul 12, 2013

Dear students,

A Graded Discussion Board for 'Data Communications (CS601)' will be opened on Thursday 11 July, 2013 and it will be closed on Friday 12 July, 2013.

Discussion Topic

Suppose a national security agency wants to connect local networks of its two offices using some transmission media. As they are required to transmit very sensitive information over the transmission media so security and reliability of the information are the critical issues in this scenario. They have different options i.e. wireless and wired (coaxial, fiber optics and etc.) media to connect these offices. You are required to suggest a suitable transmission media to directly connect these offices and discuss how will your suggested media fulfill their requirements?

Read the instructions carefully before sending your comments:

10 GDB will have weight-age of 5% of your total subject marks.
2) Your discussion must be based on logical facts.
3) You should post your comments on the Graded Discussion Board & not on the Regular MDB. Both will run parallel to each other during the time specified above.
4) Your comments should be relevant to the topic i.e. clear and concise (Maximum 5-7 lines answer).
5) Books, websites and other reading material may be consulted before posting your comments. (Do not copy the material as it is.)
6)No extra time will be given for discussion.
7)You cannot participate in the discussion after the due date or through e-mail.

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Replies to This Discussion

Please Discuss here about this GDB.Thanks

Our main purpose here discussion not just Solution

We are here with you hands in hands to facilitate your learning and do not appreciate the idea of copying or replicating solutions.

Dear Students Don’t wait for solution post your problems here and discuss ... after discussion a perfect solution will come in a result. So, Start it now, replies here give your comments according to your knowledge and understandings....

Which transmission media are the most secure and the least secure?

There are three broad categories of media: Wire, fiber and wireless. On a very high level, it could be said that fiber is the most secure as it is the hardest to tap. Cable is a little more secure, as physical access is not hard to tap and sniff the passing traffic. Then there is wireless, it broadcasts point-to-point or well beyond the facility in all possible directions. Anyone that can pick up the signal may be able to sniff sensitive information. Although there is a second item we must consider, and that is the physical and technical controls that have been implemented. Wireless can be made more secure by using WPA, encryption or 802.1x. A cabled network can be fully switched, use encryption and have implemented VLANS. So the point would be that even seemingly weaker systems can have controls implemented to make their security more robust.

Transmission media selection should be based on quality needed over some estimated distance. In some cases, security may also be an issue.

Where SANs are concerned, I believe short wavelength optical fiber cabling is the best choice for most environments. Copper does not really support meaningful distances and long wavelength cabling is overkill for local cable runs.

Also, higher speed networks will work with fiber but might not support copper. Fiber optic cables are more secure and are much more difficult to snoop.


Jams Khan thanks for sharing ur idea ..keep it up 

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It would be convenient to construct a network of only one medium. But that is impractical for anything but an extremely small network. In general, networks use combinations of media types. There are three main categories of media types:

  • Copper cable—Types of cable include unshielded twisted-pair (UTP), shielded twisted-pair (STP), and coaxial cable. Copper-based cables are inexpensive and easy to work with compared to fiber-optic cables, but as you'll learn when we get into the specifics, a major disadvantage of cable is that it offers a rather limited spectrum that cannot handle the advanced applications of the future, such as teleimmersion and virtual reality.
  • Wireless—Wireless media include radio frequencies, microwave, satellite, and infrared. Deployment of wireless media is faster and less costly than deployment of cable, particularly where there is little or no existing infrastructure (e.g., Africa, Asia-Pacific, Latin America, eastern and central Europe). Wireless is also useful where environmental circumstances make it impossible or cost-prohibitive to use cable (e.g., in the Amazon, in the Empty Quarter in Saudi Arabia, on oil rigs).
  • There are a few disadvantages associated with wireless, however. Historically, wireless solutions support much lower data rates than do wired solutions, although with new developments in wireless broadband, that is becoming less of an issue (see Part IV, "Wireless Communications"). Wireless is also greatly affected by external impairments, such as the impact of adverse weather, so reliability can be difficult to guarantee. However, new developments in laser-based communications—such as virtual fiber—can improve this situation. (Virtual fiber is discussed in Chapter 15, "WMANs, WLANs, and WPANs.") Of course, one of the biggest concerns with wireless is security: Data must be secured in order to ensure privacy.
  • Fiber optics—Fiber offers enormous bandwidth, immunity to many types of interference and noise, and improved security. Therefore, fiber provides very clear communications and a relatively noise-free environment. The downside of fiber is that it is costly to purchase and deploy because it requires specialized equipment and techniques.

Twisted pair is the most common, because it is cheapest. Shielded twisted pair is similar, but has a foil around the outside of the pairs to prevent electrical noise, which is good if the cable has to pass over floresent lights. Coaxial is getting outdated, because usually requires a token ring topology. Twisted pair uses a Star topology which means all lines star off from a switch. Optical fiber cable is used for longer distance runs (100 Meters or more), because it does not have the loss of copper wire.
So for a 'large company' it depends on the building size. Usually they have fiber between 2 (or more) office buildings, and twisted pair inside the building from the switch to each workstation. If a cable run needs to be over 100 Meters in 1 building, then either thier needs to be another switch in betweeen or a fiber.

tariq malik plzzz muje 601 ki gdb ka topic samja den k kia hai

One of the transmission mediums that is considered very safe and s
ecure is the
use of fiber optic cabling. Fiber optic cabling
connects networks together at
very high
data rate.
Of course this is determined by the capabilities and size of t
he fiber itself.
Fiber comes primarily in 2 sizes, Single mode or Multi
mode. There are several
differences between Single and Multi

mode fiber.

Where as!

Microwaves are not considered secure media since the signal is tr
ansmitted over

unsecure distances, often over metropolitan areas.

Twisted pair has the obvious problem that it can be tapped into at any point along which

it is run.


The individual cable connections could be broken and only the node

connected to that cable connection would be affected. T

In my opinion the agency will be certain about the wired networking because they are more secure and reliable for sensitive data as comparison with the wireless as there is a chance of more users accessing same information.

Wired Networking
A wired network uses Ethernet cable to connect the computers to the network router. Wired networks are less expensive, faster, reliable and more secure than wireless networks. However, the same Ethernet cable that provides these advantages, is also its biggest disadvantage. All computers on a wired network must be connected by Ethernet cable. Running Ethernet cables between rooms or floors can be a significant challenge.

Wireless Networking
A wireless home network provides the flexibility to connect your computers to the network using wireless network adapter devices. Data is sent and received using radio waves that eliminate the need for Ethernet cables. You can connect to the network from anywhere within range of the wireless router. Wireless networks trade speed and some loss of security for greater flexibility and ease of use. and are not very reliable.

+ " Hani_MIT " gud keep it up & thanks for sharing 

Attention Students: You don’t need to go any other site for this assignment/GDB/Online Quiz solution, Because All discussed data of our members in this discussion are going from here to other sites (Other sites Admins posted with fake IDs at their sites :p ). You can judge this at other sites yourself. So don’t waste your precious time with different links.

I also suggest  the fiber optic because The biggest advantage is that communication is very quick since data travels with the speed of light and its also provide security and reliability


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