UNIVERSITY OF BOLTON SCHOOL OF CREATIVE TECHNOLOGIES COMPUTING PATHWAYS SEMESTER TWO EXAMINATION 2016/2017 NETWORK MANAGEMENT MODULE NO: CPU6009

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1 UNIVERSITY OF BOLTON [CRT06] SCHOOL OF CREATIVE TECHNOLOGIES COMPUTING PATHWAYS SEMESTER TWO EXAMINATION 2016/2017 NETWORK MANAGEMENT MODULE NO: CPU6009 Date: Thursday 18 th May 2017 Time: 14:00 16:00 INSTRUCTIONS TO CANDIDATES: There are SIX questions. Answer ANY FOUR questions. All questions carry equal marks. Marks for parts of questions are shown in brackets. Electronic calculators may be used provided that data and program storage memory is cleared prior to the examination.

2 Page 2 of 5 Question 1 1a) Explain the concept of Flow Management used in data networks both from an Enterprise and Provider perspective. Include a brief review of the different standards currently being used. Define the unique keys used in this technology. Describe how flow management can assist network managers to identify problems encountered in the network. [14 Marks] 1b) With regard to IPv4 traffic flows: explain the process of fragmentation. Use as an example a 4000 Byte (FDDI) packet traversing a router link with MTU=508. [7 Marks] 1c) How would you remotely monitor a port that has intermittent issues such as dropping in and out of service on a router or switch, using SNMP commands? Give two SNMP command line examples. [4 Marks] Question 2 2a) Give a critical analysis of the various elements of an SNMP protocol stack. In particular include layers involved at both the ends and across the network. Your description of the end system should include the interaction of (SMI, ASN.1 and BER). 2b) Explain in detail how you would remotely retrieve statistics from managed devices such as a Router and Ethernet Switch using SNMP commands at the command line prompt. If you wanted to traverse a group of OID s what command would you use? [9 Marks] 2c) The Management Information Base (MIB) is one of the fundamental elements of system. Give a descriptive account of the MIB structure, its role and details about interface and RMON areas. Your focus should be the areas used during the module assessment. [6 Marks]

3 Page 3 of 5 Question 3 3a) Critically appraise what a System consists of. Include the various functions and features of the Telecommunications Management Network (TMN). Include also the impact of SNMP on the ITU standards. Give practical examples of management systems used at different levels of the management structure. [15 Marks] 3b) In a multi-vendor environment that contains various versions of SNMP and non-snmp devices, show how these problems can be overcome and accommodated with an SNMP Management system. 3c) Given the command line shown below, explain what each of the components is used for: snmpwalk v1 u monitor c public List the primitive commands used in SNMP versions 1 and 2 and explain what the following commands are used for: snmptranslate and snmptable Question 4 4a) Critically appraise the major advantages a modern central core network based on IP-MPLS, such as BT s 21CN has, over vertical based separate networks. What disadvantages do pure IP or ATM core networks have? Access to these modern networks may use GFP over SDH. Explain the fundamental aspects of these two systems, essentially describing what they do. 4b) Give a detailed account of how would you manage point to point link performance in an Enterprise network based on using SNMP, command line and open source tools? The scope of this analysis covers both the link and end points. Include details of parameters measured and any Open Source tools, which are useful in achieving these measurements. 4c) Outline what is meant by the term PMTU Black Hole Router and hence describe the impact on managing such network connections.

4 Page 4 of 5 Question 5 5a) Critically appraise the latency factors involved when downloading a file across a network of interconnected LANs and WANs. Assess this scenario for both TCP and UDP transmissions. If you suspected that a stream of data was suffering with packet loss, how would you measure such problems? 5b) Show using BGP examples how a network manager can at least hint to external neighbours about the preferred path into an Autonomous System. It is essential to include a diagram showing various traffic flows, settings and choices. [7 Marks] 5c) The IT help desk in a local hospital has received a large number of complaints from staff about the time taken to retrieve patient records from the central database. The network consists of Cisco switches and Linux servers, which are managed by CLI only. You must outline a plan to monitor and measure the performance of this network including servers. Your methodology must be able to show whether the problem is with the network or the servers. [8 Marks] Question 6 6a) Give a critique of the deployment issues surrounding the introduction of VoIP. Include in your answer the advantages and disadvantages, VoIP quality, convergence issues and the prioritisation of traffic. [9 Marks] 6b) i) Evaluate what is meant by 1 Erlang of traffic and hence define what an Erlang is. You must include in your discussion the term Centrum Call Second. ii) Using Erlang to Packet conversion, what is the equivalent throughput in bytes of 8 Erlangs, based on 64kbps channels? Question 6b continues over the page.

5 Page 5 of 5 Question 6b continued. iii) Using the table below, which is an extract from an Erlang B table, calculate the following: Scenario 1: If 4 Erlangs of VoIP traffic are required and the grade of service needed is to be P.015, how many trunks are required for this transmission? Scenario 2: Given 4 trunks and a probability of blocking GOS = 0.05, how many Erlangs of traffic can be carried by this network? Scenario 3: Given 2 Erlangs of traffic that uses 8 trunks, what is the probability of blocking? No. of Traffic (A) in erlangs for P = Trunks (N) 0.1% 0.2% 0.5% 1% 1.2% 1.3% 1.5% 2% 3% 5% 7% 10% c) Justify the rationale for using different traffic tables for different situations. You must include details of types of traffic matched to a particular type of traffic table. [6 Marks] END OF QUESTIONS

UNIVERSITY OF BOLTON CREATIVE TECHNOLOGIES COMPUTING PATHWAYS SEMESTER TWO EXAMINATION 2017/2018 NETWORK MANAGEMENT MODULE NO: CPU6009

UNIVERSITY OF BOLTON CREATIVE TECHNOLOGIES COMPUTING PATHWAYS SEMESTER TWO EXAMINATION 2017/2018 NETWORK MANAGEMENT MODULE NO: CPU6009 UNIVERSITY OF BOLTON [CRT10] CREATIVE TECHNOLOGIES COMPUTING PATHWAYS SEMESTER TWO EXAMINATION 2017/2018 NETWORK MANAGEMENT MODULE NO: CPU6009 Date: Thursday 24 th May 2018 Time: 14:00 16:00 INSTRUCTIONS