Download OSPF Networks - Computer Networks - Old Exam Paper and more Exams Computer Networks in PDF only on Docsity! Page 1 Cork Institute of Technology Bachelor of Science in Computing in Information Technology Support – Award (NFQ – Level 7) Spring 2006 Computer Networks (Time: 3 Hours) Answer any FOUR questions Examiners: Mr. J. Greenslade All questions carry equal marks Mr. T. Horgan Question 1 – Advanced IP a) A company has five sites, connected in a full-mesh topology by Frame-Relay PVCs. The sites have 45, 30, 24, 11 and 3 hosts, respectively. They have been assigned network 223.70.156.0/24. Using VLSM, subnet their network. (15) b) Using the internetwork diagram below, show how route summarisation reduces the burden on the upstream router, RTZ, enabling it to advertise a single aggregate route. Clearly show how routes are aggregated by RTA, RTB, RTC and RTZ. (6) c) Outline the main advantages of using route summarisation. (4) Page 2 Question 2 – Network Applications a) Explain in detail what happens when the CIT nameserver receives a query for host dev.pentium.intel.com. (12) b) BIND uses the following record types, A, CNAME, MX, PTR, NS, SOA. Briefly explain the purpose of each record type. (6) c) Write about the functions and operation of a Mail Transfer Agent (MTA), Mail Delivery Agent (MDA) and a Mail User Agent (MAU). Describe the main differences between POP and IMAP. (7) Question 3 – OSPF a) The key to effectively designing and troubleshooting OSPF networks is to understand the relationships, or states, that develop between OSPF routers. List these states and describe in detail what happens at each phase. (14) b) A significant number of routers can exist on a multi-access network. The designers of OSPF developed a system to avoid the overhead that would be created if every router established full adjacency with every other router. Describe this system. (7) c) List the advantages that Link-State Routing Protocols have over the traditional distance vector algorithms, such as the Routing Information Protocol (RIP). (4) Question 4 – SNMP & PPP & DHCP a) PPP specifies two sub protocols. What are the functions of theses sub protocols? (8) b) Outline the operation of the Challenge Handshake Authentication Protocol (CHAP). How does CHAP differ from Password Authentication Protocol (PAP)? (6) c) An SNMP management system to uses four operations to manipulate the managed objects maintained by an SNMP agent. Write a brief note about each of these operations. (6) d) Write a brief note on the SNMP MIBs (Management Information Base). (5)
