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

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1 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 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 6 Question 1 1a) Discuss how Systems have evolved; to incorporate standards based features such as the Telecommunications Management Network (TMN) and de facto SNMP elements. Include practical examples of management systems used at various TMN levels. [13 Marks] 1b) Explain the process of fragmentation used in IPv4 networks. Use as an example a 4352 Byte (FDDI) packet traversing a router link with MTU=528. Indicate how things would differ in an IPv6 environment. [8 Marks] 1c) How would you accommodate non-snmp and various versions of SNMP in a managed communications network. [4 Marks] Question 2 2a) Discuss the interaction of Structure of Management Information (SMI), Abstract Syntax Notation One (ASN.1) and Basic Encoding Rules (BER) used in a managed network managed scenario. [9 Marks] 2b) Using SNMP commands explain in detail how you would retrieve statistics from a managed device such as a Router or Ethernet Switch. If you wanted to traverse a group of OID s what command would you use? If you wanted to analyse utlisation of an Ethernet Switch port, how would you do it? If you wanted to analyse packet size distribution, how would you achieve it? [12 Marks] 2c) Explain the role of both counters and gauges used in routers and switches. What problems can occur when using counters for utilisation checks? [4 Marks] PLEASE TURN THE PAGE.

3 Page 3 of 6 Question 3 3a) With regard to Flow Management used in data networks, explain what a Flow is. Include a brief review of the different standards currently being used. Define the unique keys used in this technology. Describe how this technology can assist network managers to identify and mitigate attacks encountered in the network. [12 Marks] 3b) Given the command line shown below, explain what each of the components is used for: snmpwalk v1 u monitor c public If this command was issued to a network switch what would be displayed? [7 Marks] 3c) List the primitive commands used in SNMP versions 1 and 2 and explain what they do. [6 Marks] Question 4 4a) Discuss the deployment of SDH and DWDM transmission infrastructure used in modern core networks. What disadvantages do pure IP or ATM core networks have? Access to these modern networks may use Carrier Ethernet with GFP over SDH. Appraise the fundamental aspects of these systems, essentially describing what they do. [12 Marks] 4b) Using a combination of SNMP commands and Open Source networking analysis tools, give a detailed account of how would you manage point to point link performance in an network. 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. [8 Marks] 4c) Outline what is meant by the term PMTU Black Hole Router and hence describe the impact on managing such network connections. [5 Marks]

4 Page 4 of 6 PLEASE TURN THE PAGE. Question 5 5a) In a typical TCP file download scenario, explain all the potential aspects that contribute to latency. [10 Marks] 5b) With the aid of a diagram explain what is meant by Hot Potato and Cold Potato routing between an ISP and customers. Include any mechanisms that will potentially be able to direct traffic to a preferred destination. [7 Marks] 5c) Explain what issues and challenges a network manager has to address to implement a multi-vendor management system. [8 Marks] Question 6 6a) Discuss the issues surrounding compliance in networks. Detail as many compliance standards required in modern networks. [9 Marks] 6b) i) What is meant by 1 Erlang of traffic and hence define what an Erlang is. You must include in your discussion the term CCS Centrum Call Second. ii) Using Erlang to Packet conversion, what is the equivalent throughput in bytes of 12 Erlangs, based on 64kbps channels? iii) Using the table below, which is an extract from an Erlang B table, calculate the following: Scenario 1: If 2 Erlangs of VoIP traffic are required and the grade of service needed to overcome interference is to be P.002, how many trunks are required for this transmission? Question 6 continues over the page.

5 Page 5 of 6 PLEASE TURN THE PAGE. Question 6 continued. Scenario 2: Given 3 trunks and a probability of blocking GOS = 0.05, how many Erlangs of traffic can be carried by this network? Scenario 3: Given 4 Erlangs of traffic that utilise 7 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% [10 Marks] 6c) In a VoIP based network scenario, justify the rationale for using different traffic tables for different situations. You must specify the type of traffic and which tables are appropriate for that particular scenario. [6 Marks]

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

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