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Assignment 3
Deadline: Thursday 28-Nov-19@ 23:59
[Total Mark for this Assignment is 6]
Network Management
IT340
College of Computing and Informatics
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Question One
3 Marks
Learning Outcome(s):
LO3: Evaluate different SNMP tools, network statistics tools, and protocol analyzer for network management.
Compare between the three cryptographic algorithms DES, IDEA and RSA by filling the following table:
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Stands for |
Type |
Key size |
Advantage |
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DES |
Data Encryption Standard |
symmetric cryptography (secret key cryptography)
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56-bit key |
1- Designed for efficient hardware implementation. 2- faster than asymmetric Cryptography such as RSA. |
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IDEA |
international Data encryption Algorithm |
symmetric cryptography (secret key cryptography)
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128-bit key |
1- More secure than DES. it uses a 128 bits key which is double than the key size of the DES
2- functions efficiently in software implementation.
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RSA |
Rivest–Shamir–Adleman |
Asymmetric Cryptography ( Public Key Cryptography)
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512-bit key
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1- used to encrypt secret key
2- More secure than DES , IDEA |
Question Two
1.5 Marks
Learning Outcome(s):
LO4: Understand the importance of broadband networking services and technologies.
Compare ATM and MPLS broadband protocol in terms of class of Quality of Service (QoS) to satisfy different kinds of traffic.
Answer
Four classes of traffic have been defined in ATM network to implement quality of service.
1. Constant bit rate (CBR) used with voice
2. real-time variable bit rate (VBR-RT), used with Streaming video such as real-time video on the Internet
3. non-real-time variable bit rate (VBR-NRT), used with still images
4. Available bit rate (ABR) , used with IP data traffic
The MPLS label contains 3-bit experimental which are used to describe the class of service. Using class of service, the network treats packets differently based on the application or packet’s priority. The number of classes of quality is service provider specific, however most companies assign up to four classes of service to different types of traffic which are:
1. Class A premium traffic e.g. VOIP or Video over IP
2. Class B Critical traffic e.g. financial transactions
3. Class C business traffic e.g. database applications
4. Class C standard traffic, which is the default class e.g. web browsing
Question Three
2 Marks
Learning Outcome(s):
LO5: Differentiate between various wired and wireless broadband network access techniques.
Cite and describe any three factors to decrease digital subscriber line (DSL) speed at customer end.
Answer
1. Incorrect network configuration leads to high latency and so low speed.
2. The messy wiring used to connect the user to the DSL service provider.
3. The existence of high noise over the telephone lines which requires installing a splitter or DSL filter reduce the line interference.
4. The interfere between unwanted noise and the DSL or voice connections
5. Not using high quality filters that lower the noise which interfere with the DSL signals
6. Some Electronic devices such as wireless phones and microwave oven generate electromagnetic "noise" that can sometimes interfere with the DSL signal and reduce performance.
7. The Nonexistence of Plain Old Telephone Service POTS splitter which separates voice and data signals and so improve the quality of voice and data.
8. The usage of long cable line from the cable modem to the telephone jack which creates more interference that slows down the speed of the DSL connection.
9. The distance from the user home to the nearest telephone company office greatly affects DSL speed, longer lengths produce slower speeds.
10. Technical problems such as virus infection and poor software configuration can cause DSL to appear as if it has slowed down.
11. Interference coming from nearby networks using the same frequency and channels.
