


Study with the several resources on Docsity
Earn points by helping other students or get them with a premium plan
Prepare for your exams
Study with the several resources on Docsity
Earn points to download
Earn points by helping other students or get them with a premium plan
Community
Ask the community for help and clear up your study doubts
Discover the best universities in your country according to Docsity users
Free resources
Download our free guides on studying techniques, anxiety management strategies, and thesis advice from Docsity tutors
The exam paper for computer networks iii course at the cork institute of technology, covering topics such as hierarchical networks, ospf terminology, vlans, security, and voip. The exam is divided into six questions, each with multiple parts, and students are required to answer any four of them.
Typology: Exams
1 / 4
This page cannot be seen from the preview
Don't miss anything!
Answer any FOUR questions Examiners: Ms. John Walsh All questions carry equal marks Mr. James Greenslade Ms. T. Murphy
Question 1
(a) Explain the concept of a hierarchical network. (4 marks)
(b) Explain the difference between satellite and wireless. (5 marks)
(c) Define the terms DTE and DCE. Explain the difference between them and list some devices that are classed as DTE and DCE. (6 marks)
(d) Explain the following terms: (i) Routing protocol (ii) Routed protocol (iii) Autonomous systems (iv) Interior routing protocols (v) Exterior routing protocols (10 marks)
(a) Explain the following OSPF terminology. (i) Area (ii) Adjacency database (iii) Linkstate database (iv) Forwarding database (v) Cost (10 marks)
(b) Given the following diagram, write out the OSPF configuration required on each router. The networks are 192.168.14.0/30 and 192.168.15.0/ (5 marks)
(c) Explain the difference between a DR and a BDR and how they are elected. (5 marks)
(d) OSPF routers rely on 5 different kinds of packets to identify their neighbours and to update link-state routing information. Explain the 5 kinds of packets. (5 marks) Question 3
(a) Explain the difference between dynamic and static VLAN’s and when you would use each type. (5 marks)
(b) Explain the two types of Layer 3-based VLAN’s, listing the advantages and disadvantages of each. (7 marks)
(c) Give a detailed explanation of the 3 VTP modes. (6 marks)
(d) Given the following diagram, write out the VLAN and VTP configuration required on the three switches, using the central one as the server. (7 marks)
(a) With regard to VOIP, explain the different types of convergence. (6 marks)
(b) What services are provided by the Real Time Transport Protocol (RTP) and the Real-time Transport Control Protocol (RTCP)? (6 marks)
(c) Explain the IEEE 802.11 wireless LAN standard. (5 marks)
(d) In the context of WLANs, explain the following: (i) Basic Service Set (BSS) (ii) Independent BSS (IBSS) (iii) Extended Service Set (ESS) (iv) Distribution system (DS) (8 marks)