Pg. 03 Question Three Assignment 3 Deadline: Thursday [email protected] 23:59 [Total Mark for this Assignment is 6] Network Management IT340 College of Computing and Informatics 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: Stands for Type Key size Advantage DES Data Encryption Standard symmetriccryptography (secret key cryptography) 56-bit key 1- Designed for efficient hardware implementation. 2- faster than asymmetric Cryptography such as RSA. IDEA international Data encryption Algorithm symmetric cryptography (secret key cryptography) 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. RSA Rivest–Shamir–Adleman Asymmetric Cryptography ( Public Key Cryptography) 512-bit key 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 th ...

1. Pg. 03
Question Three
Assignment 3
Deadline: Thursday [email protected] 23:59
[Total Mark for this Assignment is 6]
Network Management
IT340
College of Computing and Informatics
Question One
3 Marks
Learning Outcome(s):
LO3: Evaluate different SNMP tools, network statistics tools,
and protocol analyzer for network management.

2. Compare between the three cryptographic algorithms DES,
IDEA and RSA by filling the following table:
Stands for
Type
Key size
Advantage
DES
Data Encryption Standard
symmetriccryptography (secret key cryptography)
56-bit key
1- Designed for efficient hardware implementation.
2- faster than asymmetric Cryptography such as RSA.
IDEA
international Data encryption Algorithm
symmetric cryptography (secret key cryptography)
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.
RSA
Rivest–Shamir–Adleman
Asymmetric Cryptography
( Public Key Cryptography)
512-bit key

3. 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

4. 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

5. 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.
Pg. 01
Question One
Assignment 3
Deadline: Thursday [email protected] 23:59
[Total Mark for this Assignment is 6]
Network Management
IT340
College of Computing and Informatics

6. 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:
Stands for
Type
Key size
Advantage
DES
IDEA
RSA

7. 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.
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.