Exam: Internetworking & Security for Software & Networking Students - CIT, Exams of Computer Networks

Download Exam: Internetworking & Security for Software & Networking Students - CIT and more Exams Computer Networks in PDF only on Docsity! Cork Institute of Technology Bachelor of Science (Honours) in Software Development and Computer Networking - Stage 3 (Bachelor of Science in Software Development and Computer Networking – Stage 3) (NFQ – Level 8) Autumn 2005 Internetworking and Security (Time: 3 Hours) Answer any FOUR questions. All questions carry equal marks. Examiners: Dr. D. Chambers Mr. T. Parslow Mr. P. O' Connor Mr. A. McDonald Q1. a. The network 192.1.1.0/24 has been allocated to you by your ISP. Using VLSM, design a your IP addressing scheme to cater for the following requirements: 2 Ethernet LANs (40 hosts each), 3 Ethernet LANs (20 host each) and 3 point-to-point WAN connections. (Assume subnet zero is allowed – extra marks will be given for leaving the most usable address space remaining) (5 marks) b. Your company expands and there is now a requirement for 3 new Ethernet LANs, each with up to 40 hosts. Outline two methods that could be implemented to satisfy this new requirement, discussing the advantages and disadvantages of each. (5 marks) c. Define the following OSPF terms: i. Designated Router (3 marks) ii. Link State Database (2 marks) iii. Neighbours (3 marks) iv. 224.0.0.5 (2 marks) v. Type 3 LSA. (3 marks) vi. Autonomous System Border router (2 marks) (Total 25 marks) 2 Q2. a. The diagram below depicts a typical LAN used in a company, with Ethernet switching used in conjunction with a router-on-a-stick for IP internetworking. The Ethernet is using VLANs to arrange the user groups of the company into their own individual workgroups. Outline how the following protocols/applications work, and how they play an important role in the above network: i. IEEE 802.1Q (4 marks) ii. Spanning Tree (3 marks) iii. Inter-VLAN routing (2 marks) b. VLAN Trunking Protocol (VTP) is a messaging protocol that advertises and synchronizes VLAN configuration information. It operates in three modes. What are they? Outline their basic functionality. (6 marks) c. According to Bellovin and Cheswick, what are the three main characteristics of a firewall system? (3 marks) d. What is a VPN? (2 marks) A VPN application can be described as a “tunnelling protocol”. Discuss? (2 marks) What services does a secure VPN offer? (3 marks) (Total 25 marks) Q3. a. Outline the five categories in the functional model of Network Management? (10 marks) b. What is the significance of RMON in network management? (4 marks) c. SNMP uses well-defined messages to gather management information. Outline the structure of this message and outline the function of four of the messages types. (6 marks) d. Discuss the information model of network management, objects, their naming and their storage. (5 marks) (Total 25 marks) Switch-A Switch-B Public Internet VLAN 10 VLAN 20 VLAN 20 VLAN 30 Router