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Cork Institute of Technology
Higher Certificate in Computing in Information Technology Support – Award
(NFQ – Level 6)
Spring 2007
Computer Networking
(Time: 2 Hours)
Answer any FOUR questions Examiners: Mr. T. Horgan Mr. J. Greenslade Mr. J. Walsh
Question 1 - Scaling IP Addresses a) A Munster based company has been assigned network address 202.100.56.0/24 and wishes to create the following network configuration. Create an efficient subnet arrangement for this company. Give reasons for each address block allocation. (15)
b) Why is VLSM only compatible with classless routing protocols? Give examples of classful and classless routing protocols. (5) c) What is an address mask, and how does it work? (5)
Question 2 – Distant Vector Routing a) Describe a router and how it operates. (5) b) What are the differences between distance vector and link state routing protocols? (5) c) Describe several problems associated with distance vector protocols. (5) d) Why does the Data Link layer address changes each time a packet is routed through a router? (5) e) By default, routers learn paths to destinations using three different methods. Briefly describe each method. (5)
Question 3 – Bridges & Spanning Tree a) How does a bridge determine whether a frame is forwarded or filtered? (5) b) Describe, in general terms, the reasons for implementing LAN segmentation. (5) c) What is purpose of the Spanning Tree Protocol (STP)? (5) d) What are the STP states? Which state can only be manually configured? (5) e) What is the difference between a blocked port and a disabled port? (5)
Question 4 – Link-State Routing a) What are the five OSPF packet types and what is the purpose of each type? (5) b) What is an OSPF Router ID and how is it determined? (5) c) What does the OSPF neighbour status Two-Way mean? (5) d) What are the advantages of using OSPF over RIP? (5) e) Explain the basic steps involved in converging a link state network. (5)
